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when is an ideal time for top end rebuild

This is a discussion on when is an ideal time for top end rebuild within the Polaris forums, part of the Brand Specific Snowmobile Discussion category; I keep getting conflicting reports on when to do a top end rebuild on my 99xlt. Sled has 5400 miles on it and compression is ...

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Thread: when is an ideal time for top end rebuild

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    when is an ideal time for top end rebuild

    I keep getting conflicting reports on when to do a top end rebuild on my 99xlt. Sled has 5400 miles on it and compression is 119, 121, 121 (PCM). Some peeps are saying when it hits 6000 you should just refresh the top end, others are saying as long as compression is with in 5-10% and you're above 100, then leave it alone and drive it.

    Can someone throw me a bone and let me know what i should do. I ain't bored, so i don't need the extra work on doing a top end. Kids keep me PLENTY busy.

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    Ugly_old_Poo_kid's Avatar
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    Ideal time for a top end rebuild, is over the summer when you aren't using the sled.
    CanadianXCR and polaris91 like this.
    ---------------------------------------------

    16 - Axys 800 Switchback - Yeah, I had to get one of them!! http://www.polaris.com/en-us/snowmob...itchback-pro-s
    05 - Edge 800 Touring - Flying couch - SOLD
    03 - Edge 700 SKS - Warhead - in progress of another chassis rebuild.
    91 - 650 RXL SKS improved stock drag sled - Bastard Child

  3. #3
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    is time to make the firewood!!!
     
    xcr440's Avatar
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    ^^^ and before it blows up......
    2003 Pro x 700
    almond/blue,10-66, black/red,team 719, T-flow, 440 mains

    1997 XCF 440

    1997 XCR440
    HSP Black,S51HR, Team Sec,19/39,380 main,17.5 PAJ's,ufo's,T-flow below shelf,159 P-4 nozzles, stock 6DH7 needle #2 pos.

    1998 Indy 500

    1987 Sport 340

    Past toys;
    1998 Explorer|1999 F-250 SD V10 | 1997 F-150 SC 5.4L | 1995 F-150 RC 5.0L | 1980 F-150 RC 5.0L | 1980 Chevy CK 1500 350ci 3.4 ton lifted springs |

    1998 XC 700 | 1996 ULTRA SP | 1995 XCR 600 | 1991 RXL | 1992 XCR 440 | 1990 INDY 400 | 1987 INDY 400 | 1987 INDY TRAIL |

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    LOL, thanks guys, so in other words, just pull the engine out and do it, lmao. I guess it can sit on my workbench and i can chip away at it.

    How do i know what size pistons to get? New on the top end rebuild, but am certainly willing to put this into my repertoire of "I DID IT BY MYSELF".

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    Ugly_old_Poo_kid's Avatar
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    You measure the cylinder diameter, with a tool meant for it.

    These are pretty cheap, and you can get a measurement with a digital caliper that's close enough to tell if it's a standard bore or oversize.

    Amazon.com: Anytime Tools 6 pc 5/16" - 6" PRECISION TELESCOPIC T BORE GAUGE SET: Home Improvement
    ---------------------------------------------

    16 - Axys 800 Switchback - Yeah, I had to get one of them!! http://www.polaris.com/en-us/snowmob...itchback-pro-s
    05 - Edge 800 Touring - Flying couch - SOLD
    03 - Edge 700 SKS - Warhead - in progress of another chassis rebuild.
    91 - 650 RXL SKS improved stock drag sled - Bastard Child

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    is in need of feet of snow
     
    FastPolaris's Avatar
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    IMO, i'd be more worried about the bottom end more so than the top end. If you're going to do the top spend the extra money and do everything.
    Second prize is a set of steak knives. Third prize is you're fired.

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    i think i would be happy with those numbers and the mileage for another 1000 fairly gently used miles, but if i had the cash i would go thru it top to bottom, plus new hoses, motor mounts ect
    scorp stinger w fuji 440, dont ask
    (2) 1994 440 sports
    1 - bone stock with 488
    2 - low gears built for ditchbangin
    (2) 1994 488 trails
    1 - bone stock, p+p 488
    2 - distressed snowmobile recovery unit. 133x1.5
    racks and smash bars loaded with tools, parts,
    recovery equip
    1998 700 xcr...in limbo
    plus proly enough parts to put together 4 complete
    triple wedge snowmobiles

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    Quote Originally Posted by FastPolaris View Post
    IMO, i'd be more worried about the bottom end more so than the top end. If you're going to do the top spend the extra money and do everything.
    esp if pulling engine. to me top end is one of those "munched a ring, fix today ride tonight" projects
    scorp stinger w fuji 440, dont ask
    (2) 1994 440 sports
    1 - bone stock with 488
    2 - low gears built for ditchbangin
    (2) 1994 488 trails
    1 - bone stock, p+p 488
    2 - distressed snowmobile recovery unit. 133x1.5
    racks and smash bars loaded with tools, parts,
    recovery equip
    1998 700 xcr...in limbo
    plus proly enough parts to put together 4 complete
    triple wedge snowmobiles

  9. #9
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    is Ridin the XC600RMK this
    year.....good times
     
    XC600RMK's Avatar
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    what sled do u have?
    You need to put a diaper over ur mouth, cuz that's where all the CRAP is coming from.....

    IM A FRIEND OF FAST,he knows me well....

    2004 Polaris PRO-X 600, lots of add ons and go fast parts.......
    1998 XC600 converted to a RMK, best of both worlds. Lots of add ons and go fast stuff also.....
    My sons, 1998 XC600,450 original miles, lots of add ons,updates and go fast stuff......
    Lil fellas, 1983 Polaris Star 250, clean lil sled made up to look like a sno-x sled....

    **2000 Chevy Blazer ZR2, Flowmaster exhaust,Hi-Flow intake & 33" Mudders
    **2003 Dodge Ram Quadcab, Flowmaster exhaust,Hi-Flow intake

  10. #10
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    Quote Originally Posted by XC600RMK View Post
    what sled do u have?
    me?

    if not, excellent reminder to fix my profile
    scorp stinger w fuji 440, dont ask
    (2) 1994 440 sports
    1 - bone stock with 488
    2 - low gears built for ditchbangin
    (2) 1994 488 trails
    1 - bone stock, p+p 488
    2 - distressed snowmobile recovery unit. 133x1.5
    racks and smash bars loaded with tools, parts,
    recovery equip
    1998 700 xcr...in limbo
    plus proly enough parts to put together 4 complete
    triple wedge snowmobiles

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