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Crankshaft strokeing???
- who does this?
started by Racing_joe66
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February 7th 2009 at 4:08 PM
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Racing_joe66
Junior Member
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218 Posts 
Group: Members
Member Since: February 13th 2007
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who does crankshaft stroking?? some info would be helpful.
thanks
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Site Supporter
Group: Site Supporters
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February 7th 2009 at 4:21 PM
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RMK-KING
The Fabricator Moderator
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9125 Posts 
Group: Moderators
Member Since: October 3rd 2002
Location: Center and Roseglen, ND, USA
Current Sled: 09 RMK 700 & 06 IQr 600
2008-2009 Miles: 550
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You mean making a stroker crank? You would also have to get either shorter rods or pistons if you did this. Can you just do a big bore instead? Carls cycle makes a stroker kit for polaris 600 twins,I have not seen any others though.
Current Line Up
-09 RMK Assault
-06 IQ R 600HO
-01 ProX 600
-95 XCR 600
Days get shorter,snow gets deeper,life gets better.
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February 8th 2009 at 12:53 AM
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Racing_joe66
Junior Member
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218 Posts
Group: Members
Member Since: February 13th 2007
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i already know i will need to do the pistons, thats not a problem. i just am wondering who rebuilds cranks and can stroke them? polaris 650 triples and the 500 twins.
thanks
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February 8th 2009 at 4:46 AM
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polaris1man
Average Member
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738 Posts 
Group: Members
Member Since: December 22nd 2007
Location: Nashwauk, Minnesota, USA
Current Sled: Polaris SKS700
2008-2009 Miles: not many
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Polaris Dan at Indy Specialties down in Welch, MN
Three-1999 Polaris SKS700's
2000 Polaris SKS700
2000 Polaris Ranger 6x6
2007 Polaris Sportsman 800 EFI X2
2000 Yamaha YZ 250
1996 Yamaha WR250
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February 8th 2009 at 10:12 AM
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bigwedgies
Average Member
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611 Posts
Group: Members
Member Since: November 2nd 2006
Location: lake city, pennsylvania
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it all depends what youre trying to achieve, i doubt a stroker motor is what youre looking for. plus the cost is not cheap and usually requires many other motor mods.
and what the hell did you do to the sled in your avator? it looks bad ass but hows it handle?
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February 8th 2009 at 10:46 AM
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TNT123
Junior Member
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440 Posts
Group: Members
Member Since: August 20th 2007
Location: Johnstown, NY, USA
Current Sled: 97 indy 500/95 zr 580 cat
2008-2009 Miles: 75?
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id like to know that too!^^^^^
1997 Indy 500 L/C, motor just rebuilt: runs good. lost the engine mount while riding and its not in the sled!
1995 ZR 580EFI: just needs the speedometer cable
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February 8th 2009 at 12:00 PM
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Racing_joe66
Junior Member
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218 Posts
Group: Members
Member Since: February 13th 2007
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I can't give away my secret as to what i will be doing with the motor, but i know what i am doing. i will post a forum about it when i am done with it. now as for my sled above. the whole front suspension is custom made. the shock mounts and so forth are completly made of aircraft billet aluminum and machined. the belly pan and tunnel aren't the same year. and the belly pan is not even close to being stock. THIS THING HANDLES BETTER THAN ANY NEW SLED!!!! my buddys have riden it and i rode theres and they didn't want to get off it.
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February 8th 2009 at 2:32 PM
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whitexc
Average Member
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948 Posts
Group: Members
Member Since: February 19th 2006
Location: Pendleton, NY, USA
Current Sled: XC
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Is it like a 55" ski stance or what.....pretty sweet by the looks of it.
Polaris...it IS the way out!
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February 8th 2009 at 3:36 PM
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Racing_joe66
Junior Member
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218 Posts
Group: Members
Member Since: February 13th 2007
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53" on the outside and 48" center to center.
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February 8th 2009 at 4:33 PM
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Quote originally posted by Racing_joe66
53" on the outside and 48" center to center.
Too bad it's illegal to use on most states trails...
Jared
*2006 Fusion 600HO. BMP Pipe Mod, SLP Air Horn, SLP Flo-Rites, 1.6" track.
*1986 Polaris Indy 400. Fresh Rebuilt engine. [Parting Out!]
*1989 Polaris Indy 650.[Parting Out!]
*1999 Artic Cat ZR700, Clutched, twin piped, 136x1.5 Ripsaw w/ TracksUSA's [For Sale!]
College: UW-Platteville
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February 8th 2009 at 4:35 PM
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Racing_joe66
Junior Member
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218 Posts
Group: Members
Member Since: February 13th 2007
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never heard of a law like that. nothing even close to that here in iowa.
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February 8th 2009 at 4:41 PM
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Quote originally posted by Racing_joe66
never heard of a law like that. nothing even close to that here in iowa.
Wrong.
Quote Link at Bottom Snowmobile: A motorized vehicle weighing less than one thousand pounds that uses sled-type runners or skis, endless belt-type tread with a width of forty-eight inches or less, or any combination of runners, skis or tread, and is designed for travel on snow or ice. “Snowmobile” does not include an all-terrain vehicle, as defined in section 321I.1 that has been altered or equipped with runners, skis, belt-type tracks, or treads.
Jared
*2006 Fusion 600HO. BMP Pipe Mod, SLP Air Horn, SLP Flo-Rites, 1.6" track.
*1986 Polaris Indy 400. Fresh Rebuilt engine. [Parting Out!]
*1989 Polaris Indy 650.[Parting Out!]
*1999 Artic Cat ZR700, Clutched, twin piped, 136x1.5 Ripsaw w/ TracksUSA's [For Sale!]
College: UW-Platteville
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February 8th 2009 at 4:50 PM
[ Modified February 8th 2009 at 4:53 PM
]
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Racing_joe66
Junior Member
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218 Posts
Group: Members
Member Since: February 13th 2007
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thats just the definition of what they consider is a snowmobile. no were does it state that it can't exceed 48"s.
this is what i copied off the top of the page:
It's the Law—Definitions
definition means the following: "A definition is a statement of the meaning of a word or phrase." so what they were explaining is the meaning of what they consider a snowmobile.
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February 8th 2009 at 4:50 PM
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SSnthe10s
Head Horse Power junky
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1544 Posts 
Group: Members
Member Since: November 26th 2005
Location: Dexter, MI, USA
Current Sled: 03' Pro X 700
2008-2009 Miles: 900
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Quote originally posted by wiguy05
Quote originally posted by Racing_joe66
never heard of a law like that. nothing even close to that here in iowa.
Wrong.
Quote Link at Bottom Snowmobile: A motorized vehicle weighing less than one thousand pounds that uses sled-type runners or skis, endless belt-type tread with a width of forty-eight inches or less, or any combination of runners, skis or tread, and is designed for travel on snow or ice. “Snowmobile” does not include an all-terrain vehicle, as defined in section 321I.1 that has been altered or equipped with runners, skis, belt-type tracks, or treads. HAHAHA 0\/\/Nt!!!!!!!!!!!!!!!!!!!!!!!!
-Mike
SOLD-95' RXL Fly bar, 4" pivot riser. Edge track with 144 stainless studs. Triple UNI filters. Rejetted, Clutched. She goes good for an ol' 650.
03' Pro X 700 144 megabites,Clutched,powermadd hand gaurds
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February 8th 2009 at 4:54 PM
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Quote originally posted by Racing_joe66
thats just the definition of what they consider is a snowmobile. no were does it state that it can't exceed 48"s.
hahahahaha. Are you serious?
Meaning; your snowmobile isn't legally considered a snowmobile in the state of Iowa. Thus, it is illegal to be used on the groomed snowmobile trails. 
This really is just too easy. Weren't you the guy that said the Indy 650 motor only makes 75hp tops?
Jared
*2006 Fusion 600HO. BMP Pipe Mod, SLP Air Horn, SLP Flo-Rites, 1.6" track.
*1986 Polaris Indy 400. Fresh Rebuilt engine. [Parting Out!]
*1989 Polaris Indy 650.[Parting Out!]
*1999 Artic Cat ZR700, Clutched, twin piped, 136x1.5 Ripsaw w/ TracksUSA's [For Sale!]
College: UW-Platteville
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February 8th 2009 at 4:55 PM
[ Modified February 8th 2009 at 4:59 PM
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Racing_joe66
Junior Member
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218 Posts
Group: Members
Member Since: February 13th 2007
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SSnthe10s
ok whats so funny? did i miss something?? LOL!!!
WIGUY05---------- you don't understand it do you??
show me exactly were it says it can't succed those so called inches!!!
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February 8th 2009 at 5:23 PM
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Racing_joe66
Junior Member
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218 Posts
Group: Members
Member Since: February 13th 2007
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hey WIGUY05----------- i just called the DNR officer here Al Baxter 319-240-6662, thats his cell phone number. i just called and had a little chat with him. he says i am 100% completly fine!!! if you would like to call and talk with him by all means go ahead!! he has been an officer for like 40 years here in iowa.
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February 8th 2009 at 5:42 PM
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gordonchaine
Lost never to be found.
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1803 Posts
Group: Members
Member Since: December 5th 2008
Location: Wilmington, Vermont, USA
Current Sled: 2007 polaris edge xc
2008-2009 Miles: 1200
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Quote originally posted by Racing_joe66
i already know i will need to do the pistons, thats not a problem. i just am wondering who rebuilds cranks and can stroke them? polaris 650 triples and the 500 twins.
thanks
Do you mean machining down the journals? Where are you gonna find rods to fit a custom application like that? Most any machine shop can do it but I don't see it being worth the time and money you'll have in it by the time it's done for the power. I hope your really good a math too because it's gonna take some time and number crunching to make it all come together. Good luck though.
What's your problem? RUFWM?
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February 8th 2009 at 5:49 PM
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Racing_joe66
Junior Member
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218 Posts
Group: Members
Member Since: February 13th 2007
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yes having them machined so it will have a little longer stroke. i can use the stock rods with no problems. it will just be custom pistons machined to work. i am just looking for a good shop that does snowmobile cranks and would be interested in doing a qauntity for me after doing 2-4 cranks first. i think i will need some luck. thanks!
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February 8th 2009 at 7:17 PM
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when you do a stroker you also have to weld the ports smaller, the stroke motor will require the ports in a completely different spot, a stroker motor is not one you put a hundred miles on in a day.
nothing goes like 3 holes!!
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February 8th 2009 at 7:33 PM
[ Modified February 8th 2009 at 7:35 PM
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bigwedgies
Average Member
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611 Posts
Group: Members
Member Since: November 2nd 2006
Location: lake city, pennsylvania
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i dont know f anyone running a stroker motor for a trail sled, almost always strictly a racing app. if youre gonna fork up the money id think anyone will build you the crank you want, but as said before dont forget to custom port work, usually cylinder shims are also needed, possibly ignition reprogramming. its not a cheap date.
as for people building cranks
HTG PSI SLP ive also heard of previously mentioned indy dan, flannery, thats just the couple i can come up with in a couplke seconds, the list can go on forever.
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February 8th 2009 at 7:45 PM
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gordonchaine
Lost never to be found.
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1803 Posts
Group: Members
Member Since: December 5th 2008
Location: Wilmington, Vermont, USA
Current Sled: 2007 polaris edge xc
2008-2009 Miles: 1200
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Quote originally posted by Racing_joe66
yes having them machined so it will have a little longer stroke. i can use the stock rods with no problems. it will just be custom pistons machined to work. i am just looking for a good shop that does snowmobile cranks and would be interested in doing a qauntity for me after doing 2-4 cranks first. i think i will need some luck. thanks!
I don't understand what your talking about at all. The only way I know of to "stroke" a crank is to machine the journals smaller and that moves the rod to a different spot in the crank shaft there for stroking it. But then you have to use a different rod to fit the smaller journal of the crank If your moving the wrist pin in the piston that will also change the stroke. But that's not "stroking" the crank shaft, is it? I've never heard it said that way.
What's your problem? RUFWM?
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February 8th 2009 at 8:15 PM
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erick
Alternate Realities
erick pretty much excited that it's Friday, though there are no plans for the weekend yet!
Updated Friday at 11:45 AM
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11495 Posts 
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Member Since: April 10th 2001
Location: Strathcona, MN, USA
Current Sled: IQr 800 & RMK 800
2008-2009 Miles: 800
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A two stroke crank can be stroked by slugging the original rod hole and then machining a new rod pin hole.
There are a few shops that specialize in this but a lot of other work goes into an application like this.
Port timing has to be readjusted and new pistons may be required to correct port timing and compression ratios.
A lot of calculating and two stroke knowledge is required to do make a stroked engine perform.
Along with the stroked crank you will also need a machine shop that can machine engine components such as cylinders heads and crankcase.
Experience in port grinding to correct port timing and pipe modifying.
Not a job for an amateur engine builder.
Good Luck on your project
Breaking free from the thoughts in my mind
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February 8th 2009 at 9:51 PM
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gordonchaine
Lost never to be found.
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1803 Posts
Group: Members
Member Since: December 5th 2008
Location: Wilmington, Vermont, USA
Current Sled: 2007 polaris edge xc
2008-2009 Miles: 1200
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Quote originally posted by erick
A two stroke crank can be stroked by slugging the original rod hole and then machining a new rod pin hole.
There are a few shops that specialize in this but a lot of other work goes into an application like this.
Port timing has to be readjusted and new pistons may be required to correct port timing and compression ratios.
A lot of calculating and two stroke knowledge is required to do make a stroked engine perform.
Along with the stroked crank you will also need a machine shop that can machine engine components such as cylinders heads and crankcase.
Experience in port grinding to correct port timing and pipe modifying.
Not a job for an amateur engine builder.
Good Luck on your project
Your still changing the rod and or piston right? The crank its self isn't changing.
What's your problem? RUFWM?
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February 8th 2009 at 11:18 PM
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di_99_2.7
Junior Member
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140 Posts
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Member Since: January 2nd 2009
Location: RACINE, WISCONSIN, USA
Current Sled: 96 POLARIS XCR 600 SP
2008-2009 Miles: 205
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Quote originally posted by Racing_joe66
thats just the definition of what they consider is a snowmobile. no were does it state that it can't exceed 48"s.
this is what i copied off the top of the page:
It's the Law—Definitions
definition means the following: "A definition is a statement of the meaning of a word or phrase." so what they were explaining is the meaning of what they consider a snowmobile.
48" or less is the law in wisconsin...
96 POLARIS INDY 600 XCR SP
W/PLASTIC SKIS W/8" CARBIDES FROM AN 06 FUSION, BELLY BUSTER 54 WEIGHTS, 21 TOP GEAR, PRIMARY & SECONDARY BLACK SPRINGS
COMING SOON: 39 BOTTOM GEAR "NEED TO FIND THE RIGHT CHAIN FIRST"
OVER THE SUMMER "2010" ITS GETTING BORED .30 OVER, SLP PIPES, 144 LONG TRACK CONVERSION.......=)
96 POLARIS INDY TRAIL BORED .20 OVER, AAEN PIPE, PURPLE SPRING.
91 ARCTIC CAT PROWLER CONVERTED TO A 550 L/C WITH RED/WHITE PRIMARY SPRING
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