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Engine break in
- I think I goofed up big on my part
started by Empire087
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November 4th 2009 at 7:54 PM
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Luke
Snowmofile
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903 Posts 
Group: Members
Member Since: November 27th 2005
Location: Rotterdam, NY, USA
Current Sled: 1998 XC 700
2008-2009 Miles: 410
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Quote originally posted by xcr440
yes it does, more air-less air. I've seen it done many time difference is usually 10-20 psi.
+1 def makes a differnce
1998 XC 700
SLP pipe, boost bottle, power packs, VForce, clutched, Ripsaw 1.25, M-10 susp, 2 in riser, handlebar hooks, third testicle, and good brakes.
"I have not failed, I've just found 10,000 ways that won't work." - Thomas Alva Edison
Amsoil dealer
http://www.galushascottages.com
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Site Supporter
Group: Site Supporters
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November 4th 2009 at 8:23 PM
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barney
Junior Member
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205 Posts 
Group: Members
Member Since: November 23rd 2008
Current Sled: 2004 Arctic Cat F7
2008-2009 Miles: 2153
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Quote originally posted by xcr440
yes it does, more air-less air. I've seen it done many time difference is usually 10-20 psi.
I tried it on my ultra motor with the carbs taped off and then I took the tape off and held it wide open and I didnt see a 1 psi difference. 
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November 4th 2009 at 9:36 PM
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xcr440
Sundowners Trail Coordinator
xcr440 icefish's because having feeling in your fingertips is overrated.
Updated Over 2 hours ago
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12582 Posts 
Group: Members
Member Since: February 1st 2003
Location: St.Germain/Edgerton, Wisconsin, USA
Current Sled: 03prox700/97xcr440
2008-2009 Miles: 610
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must have a less sensative guage than mine.
a good beer drinker isnt a picky beer drinker
Loggers.... Working their ass off so you can wipe yours!
"Steep ground is when your cutting a notch and notice a mountain goat looking at you like you are crazy." - Hexan
woodbooga: (WOOD-boog-ah), n. regional dialect, common to areas of New Hampshire and Maine including the towns of Ossipee, Alton, Farmington, Acton, and Lebanon; one who attempts to obtain free firewood to fuel woodburning appliances in an effort to mitigate expenses related to home heating with fossil fuels. Frequently used as a term of derision by non-woodburners who mock the presence of loose bark and other wood waste in the beds of their pickup trucks.
2003 Pro x 700 almond/blue,10-66 black/red team 719 T-flow, 440 mains
1997 xcr440 my clutch kit, 380 mains,T-flow
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November 4th 2009 at 10:32 PM
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Sno-X-treme
Senior Member
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2991 Posts
Group: Members
Member Since: October 25th 2001
Location: Menomonie, Wi, USA
Current Sled: 2006 rev 440/700
2008-2009 Miles: 400
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Quote originally posted by sledcrusher
I honestly dont think it matters what oil you use for break in. And yes, you want OVER 120 psi. I always rebuild if it goes under 110-115 in either cylinder. Maybe you used an aftermarket ring, or put something in that wasn't supposed to be in? You didnt reuse pistons or rings did you? Sometimes your piston can get wear spots which allow the ring to set wrong, and lets air through. I've been told you have to hold it WOT when you check compression ( which I rarely do anyways )
I honestly don't think you know what really happens during break in.
Quote originally posted by Empire087
Runs like a champ, first pull 99% of the time even when cold. I just tested my jag that had 145 psi compression and it only had 112. Im starting to think that the tester has gone bad.
Bad gauge. Just invest in a decent one...you'll use it for many, many years.
Quote originally posted by barney
Holding it wide open when pulling does not affect how the compression checker will read.
Look how much area there is for air to come through with the slides closed. Yea, that flows just as good as wide open
Quote originally posted by barney
Quote originally posted by xcr440
yes it does, more air-less air. I've seen it done many time difference is usually 10-20 psi.
I tried it on my ultra motor with the carbs taped off and then I took the tape off and held it wide open and I didnt see a 1 psi difference.
Your gauge is JUNK then.
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November 5th 2009 at 7:32 AM
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Ugly_old_Poo_kid
techno-bumpkin
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1079 Posts 
Group: Members
Member Since: March 18th 2007
Location: Walworth, NY, USA
Current Sled: 05 Edge & Frankenstorm II
2008-2009 Miles: 165
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Quote originally posted by barney
I tried it on my ultra motor with the carbs taped off and then I took the tape off and held it wide open and I didnt see a 1 psi difference.
LMAO!!!!
You are smokin crack dude...
95 - Storm 800 - Modded - AKA: FrankenStorm - Totalled near 100mph at Tug Hill!
96 - XLT/SP with Storm 800 trip/trip and now EFI - FrankenStorm II lives...
95 - RXL -- Sale Pending --
05 - Edge 800 long track - Stayin' stock for now..
---------------------------------------------
It made me more compassionate, more empathetic, more nurturing...
I FEEL LIKE I'M TRAPPED IN MY OWN WORST NIGHTMARE!!!
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November 5th 2009 at 4:30 PM
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polaris440xcr
Starting Member
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49 Posts
Group: Members
Member Since: January 19th 2009
Location: thunder bay, ontario, Canada
Current Sled: 98 indy 500
2008-2009 Miles: 200
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so if you hold the throttle open while doing a compression test the gauge will read higher or lower than with out any throttle?
1998 polaris indy 500
1995 polaris xcr 440
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November 5th 2009 at 5:40 PM
[ Modified November 6th 2009 at 10:26 AM
by arcticcatmatt
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barney
Junior Member
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205 Posts
Group: Members
Member Since: November 23rd 2008
Current Sled: 2004 Arctic Cat F7
2008-2009 Miles: 2153
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Quote originally posted by Ugly_old_Poo_kid
Quote originally posted by barney
I tried it on my ultra motor with the carbs taped off and then I took the tape off and held it wide open and I didnt see a 1 psi difference.
LMAO!!!!
You are smokin crack dude...
EDITED You think I would lie to the people reading this thread?
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November 5th 2009 at 5:46 PM
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Ugly_old_Poo_kid
techno-bumpkin
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1079 Posts
Group: Members
Member Since: March 18th 2007
Location: Walworth, NY, USA
Current Sled: 05 Edge & Frankenstorm II
2008-2009 Miles: 165
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If the throttle is closed it cannot suck as much air, so the compression reading will be lower.
95 - Storm 800 - Modded - AKA: FrankenStorm - Totalled near 100mph at Tug Hill!
96 - XLT/SP with Storm 800 trip/trip and now EFI - FrankenStorm II lives...
95 - RXL -- Sale Pending --
05 - Edge 800 long track - Stayin' stock for now..
---------------------------------------------
It made me more compassionate, more empathetic, more nurturing...
I FEEL LIKE I'M TRAPPED IN MY OWN WORST NIGHTMARE!!!
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November 5th 2009 at 6:07 PM
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barney
Junior Member
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205 Posts
Group: Members
Member Since: November 23rd 2008
Current Sled: 2004 Arctic Cat F7
2008-2009 Miles: 2153
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I know and that makes sense and thats why I tried it both ways. It is a cheapo tester I got on sale at a auto value so that could have something to do with it.
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November 5th 2009 at 6:46 PM
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polaris440xcr
Starting Member
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49 Posts
Group: Members
Member Since: January 19th 2009
Location: thunder bay, ontario, Canada
Current Sled: 98 indy 500
2008-2009 Miles: 200
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o ok that makes sense thanks
1998 polaris indy 500
1995 polaris xcr 440
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November 5th 2009 at 7:03 PM
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Ugly_old_Poo_kid
techno-bumpkin
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1079 Posts
Group: Members
Member Since: March 18th 2007
Location: Walworth, NY, USA
Current Sled: 05 Edge & Frankenstorm II
2008-2009 Miles: 165
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Quote originally posted by barney
**** off. You think I would lie to the people reading this thread?
You really wanna know that I think?
I think you'd be an idiot to tape off your carbs and do a compression test.
I think you'd be an even bigger idiot to tell anyone else you did it.
And I think you'd be talking out your a$$ saying that the results are no different than having WOT..
95 - Storm 800 - Modded - AKA: FrankenStorm - Totalled near 100mph at Tug Hill!
96 - XLT/SP with Storm 800 trip/trip and now EFI - FrankenStorm II lives...
95 - RXL -- Sale Pending --
05 - Edge 800 long track - Stayin' stock for now..
---------------------------------------------
It made me more compassionate, more empathetic, more nurturing...
I FEEL LIKE I'M TRAPPED IN MY OWN WORST NIGHTMARE!!!
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November 5th 2009 at 7:39 PM
[ Modified November 6th 2009 at 10:27 AM
by arcticcatmatt
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barney
Junior Member
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205 Posts
Group: Members
Member Since: November 23rd 2008
Current Sled: 2004 Arctic Cat F7
2008-2009 Miles: 2153
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Hey, it's what my compression tester said. The motor was sitting on the shelf so I taped off the carbs so **** wouldnt get in them. I forgot to take the tape off and did a compression test. Then I thought that the motor wasnt getting air and I could get higher numbers if I took the tape off and held it wide open. The compression numbers didnt change. EDITED
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November 5th 2009 at 8:39 PM
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triplefever
Junior Member
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108 Posts
Group: Members
Member Since: October 20th 2009
Location: saginaw, michigan
Current Sled: 1999 zr600 snopro
2008-2009 Miles: 3049
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this is were this is funny when i read this you can tell the difference between back yard hillybilly grease monkey and a educated mechanic (or technician for those of you who are touchy about referances)
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November 6th 2009 at 4:48 AM
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Ugly_old_Poo_kid
techno-bumpkin
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1079 Posts
Group: Members
Member Since: March 18th 2007
Location: Walworth, NY, USA
Current Sled: 05 Edge & Frankenstorm II
2008-2009 Miles: 165
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Quote originally posted by barney
Hey, it's what my compression tester said. The motor was sitting on the shelf so I taped off the carbs so **** wouldnt get in them. I forgot to take the tape off and did a compression test. Then I thought that the motor wasnt getting air and I could get higher numbers if I took the tape off and held it wide open. The compression numbers didnt change. *******
So...
To do a compression test on a motor that was sitting on a shelf, you put it all the way into a chassis? (this is an assumption because : a - it's kind of hard to get a good pull on the rope with the motor sitting on the shelf, and b - takes 2 hands to hold throttle cable WOT if you don't have it in a throttle block so you have no hands to pull the rope, and c - usually motors on shelves don't have pull-handles on the ropes)
And in all the time it took to do that, you never thought to pull the tape off the carbs?
Not taking the tape off, means you could not have looked behind the tape to keep from sucking whatever was behind it into the motor. As well as possibly sucking a piece of tape into the motor. With workmanship like that, I can understand why you wouldn't see a change by taking the tape off.
Remind me to never let you work on anything of mine.
95 - Storm 800 - Modded - AKA: FrankenStorm - Totalled near 100mph at Tug Hill!
96 - XLT/SP with Storm 800 trip/trip and now EFI - FrankenStorm II lives...
95 - RXL -- Sale Pending --
05 - Edge 800 long track - Stayin' stock for now..
---------------------------------------------
It made me more compassionate, more empathetic, more nurturing...
I FEEL LIKE I'M TRAPPED IN MY OWN WORST NIGHTMARE!!!
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November 6th 2009 at 6:19 AM
[ Modified November 6th 2009 at 10:28 AM
by arcticcatmatt
]
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barney
Junior Member
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205 Posts
Group: Members
Member Since: November 23rd 2008
Current Sled: 2004 Arctic Cat F7
2008-2009 Miles: 2153
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Ok, EDITED but since I am stronger than an 8 year old girl I can actually pull the motor over fast without it being in a chassis. Pull throttle cables with one hand and pull with my right hand. And I doubt I would pull a peice of tape in the motor because the motor isnt sucking all that much air when you are pulling it over. And lots of air enters from the exaust ports.
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November 6th 2009 at 6:34 AM
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Ugly_old_Poo_kid
techno-bumpkin
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1079 Posts
Group: Members
Member Since: March 18th 2007
Location: Walworth, NY, USA
Current Sled: 05 Edge & Frankenstorm II
2008-2009 Miles: 165
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Ok, case closed...
95 - Storm 800 - Modded - AKA: FrankenStorm - Totalled near 100mph at Tug Hill!
96 - XLT/SP with Storm 800 trip/trip and now EFI - FrankenStorm II lives...
95 - RXL -- Sale Pending --
05 - Edge 800 long track - Stayin' stock for now..
---------------------------------------------
It made me more compassionate, more empathetic, more nurturing...
I FEEL LIKE I'M TRAPPED IN MY OWN WORST NIGHTMARE!!!
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November 6th 2009 at 10:03 AM
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xcr440
Sundowners Trail Coordinator
xcr440 icefish's because having feeling in your fingertips is overrated.
Updated Over 2 hours ago
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12582 Posts
Group: Members
Member Since: February 1st 2003
Location: St.Germain/Edgerton, Wisconsin, USA
Current Sled: 03prox700/97xcr440
2008-2009 Miles: 610
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Quote originally posted by barney
Ok, dickwad but since I am stronger than an 8 year old girl I can actually pull the motor over fast without it being in a chassis. Pull throttle cables with one hand and pull with my right hand. And I doubt I would pull a peice of tape in the motor because the motor isnt sucking all that much air when you are pulling it over. And lots of air enters from the exaust ports.
wow...really.....   
a good beer drinker isnt a picky beer drinker
Loggers.... Working their ass off so you can wipe yours!
"Steep ground is when your cutting a notch and notice a mountain goat looking at you like you are crazy." - Hexan
woodbooga: (WOOD-boog-ah), n. regional dialect, common to areas of New Hampshire and Maine including the towns of Ossipee, Alton, Farmington, Acton, and Lebanon; one who attempts to obtain free firewood to fuel woodburning appliances in an effort to mitigate expenses related to home heating with fossil fuels. Frequently used as a term of derision by non-woodburners who mock the presence of loose bark and other wood waste in the beds of their pickup trucks.
2003 Pro x 700 almond/blue,10-66 black/red team 719 T-flow, 440 mains
1997 xcr440 my clutch kit, 380 mains,T-flow
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November 6th 2009 at 10:16 AM
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constantiarider91
New Member
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65 Posts 
Group: Members
Member Since: October 18th 2009
Location: constantia, new york, USA
Current Sled: 2001 xc sp 800
2008-2009 Miles: 4200 miles
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just bore it out dont hone it when u hone it theres still little scraches in the cylinder wall depending on how bad u blew up ur sled ive rebuild my xc 500 7 times and the one time we bored it out it ran like a raped ape for 2 years then blew up again for some ****in reason so yeah man do it right and when i break in my sled i dont go over 60 mph for the first 150 200 miles just to make sure everything is seated and put the oil u use in ur sled and pour a few ounces in there to make sure its rich for the first tank of gas and rejet ur sled one size up
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November 6th 2009 at 11:45 AM
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picman
Junior Member
picman is off to bag his buck. I hope. Skunked so far.
Updated Wednesday at 1:17 PM
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308 Posts
Group: Members
Member Since: January 15th 2009
Location: Marinette, WI, USA
Current Sled: 1998 Polaris Ultra
2008-2009 Miles: 1145
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Isn't the hone SUPPOSED to leave a crosshatching? This helps the oil cling to the walls until the ring scrapes it off.
Find the line between respect and fear....then flirt with it
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November 6th 2009 at 11:49 AM
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xcr440
Sundowners Trail Coordinator
xcr440 icefish's because having feeling in your fingertips is overrated.
Updated Over 2 hours ago
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12582 Posts
Group: Members
Member Since: February 1st 2003
Location: St.Germain/Edgerton, Wisconsin, USA
Current Sled: 03prox700/97xcr440
2008-2009 Miles: 610
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^^^That's what I was always told???? but what do I know????
a good beer drinker isnt a picky beer drinker
Loggers.... Working their ass off so you can wipe yours!
"Steep ground is when your cutting a notch and notice a mountain goat looking at you like you are crazy." - Hexan
woodbooga: (WOOD-boog-ah), n. regional dialect, common to areas of New Hampshire and Maine including the towns of Ossipee, Alton, Farmington, Acton, and Lebanon; one who attempts to obtain free firewood to fuel woodburning appliances in an effort to mitigate expenses related to home heating with fossil fuels. Frequently used as a term of derision by non-woodburners who mock the presence of loose bark and other wood waste in the beds of their pickup trucks.
2003 Pro x 700 almond/blue,10-66 black/red team 719 T-flow, 440 mains
1997 xcr440 my clutch kit, 380 mains,T-flow
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November 6th 2009 at 11:56 AM
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picman
Junior Member
picman is off to bag his buck. I hope. Skunked so far.
Updated Wednesday at 1:17 PM
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308 Posts
Group: Members
Member Since: January 15th 2009
Location: Marinette, WI, USA
Current Sled: 1998 Polaris Ultra
2008-2009 Miles: 1145
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Maybe I read the comments wrong. But I think he said there were still scratches from the piston committing suicide.
Dude, then more meat needs to be taken off the walls. Deep scratches will case a lose of compression among other things.
Don't get me wrong, I have known several guys who only put in new pistons and rings-never bore or anything. And away they go-with varing degrees of success!! Used to be pretty cheap to do that. I don't think so anymore.
Find the line between respect and fear....then flirt with it
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November 6th 2009 at 12:01 PM
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Ugly_old_Poo_kid
techno-bumpkin
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1079 Posts
Group: Members
Member Since: March 18th 2007
Location: Walworth, NY, USA
Current Sled: 05 Edge & Frankenstorm II
2008-2009 Miles: 165
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Wow, I've been rebuilding engines wrong since 1976, and none has blown up so it's all by dumb luck! FARG, I wish I knew earlier that honing was a waste of time, I could have saved that half hour per engine..
I guess I also don't need to oil the bearings and cylinders before assembly, or chamfer the sharp edges.. Sigh, all that time wasted!!!
And I guess I don't need clamps on that green neoprene hose either..
Any other myths you want to shatter for me?
95 - Storm 800 - Modded - AKA: FrankenStorm - Totalled near 100mph at Tug Hill!
96 - XLT/SP with Storm 800 trip/trip and now EFI - FrankenStorm II lives...
95 - RXL -- Sale Pending --
05 - Edge 800 long track - Stayin' stock for now..
---------------------------------------------
It made me more compassionate, more empathetic, more nurturing...
I FEEL LIKE I'M TRAPPED IN MY OWN WORST NIGHTMARE!!!
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November 6th 2009 at 2:51 PM
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Empire087
Dude wheres the snow?
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236 Posts
Group: Members
Member Since: July 19th 2009
Location: Sault Ste Marie, Michigan
Current Sled: 2002 ZL 500
2008-2009 Miles: 475
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One cylinder needed to be honed(the one that didn't need to be replaced) I gave it a light honing. My sled wot makes maybe a 1-3 psi difference from not on the throttle.
02 ZL 500(apv)
91 jag afs 440
"if it snowed in the summer, I'd ride!"
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November 6th 2009 at 6:08 PM
[ Modified November 6th 2009 at 6:08 PM
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barney
Junior Member
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205 Posts
Group: Members
Member Since: November 23rd 2008
Current Sled: 2004 Arctic Cat F7
2008-2009 Miles: 2153
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Quote originally posted by Empire087
One cylinder needed to be honed(the one that didn't need to be replaced) I gave it a light honing. My sled wot makes maybe a 1-3 psi difference from not on the throttle.
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November 6th 2009 at 9:23 PM
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The_Mad_Warrior
Gate Attendant
The_Mad_Warrior is a laid off bum.
Updated Wednesday at 9:59 PM
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1466 Posts
Group: Members
Member Since: February 2nd 2006
Location: Madawaska, Ontario, Canada
Current Sled: 1997 MXZ 670
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LMAO I love these type of threads. Everyone has different theories. Holding it WOT to check the compression? I never did that? And my readings were 120 PSI in my MXZ. So if I hold it open I will get what? 140 PSI? Or would it go down? Anyways.
I heard that:
Use mineroil oil after engine rebuild to break your rings in. Never hold the throttle open for very long during break in. Mix your first 3 tanks of gas 50:1. Give it shots of gas to break the engine in becuase then it will run btter after the rings are broken in.
And thats all I heard. :D
If you cant fix it with duct tape, tylnol, or band aids your screwed.
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