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  1. #2176
    Join Date
    Sep 2010
    Location
    Shuswap Highlands
    Posts
    1,469
    For an inherited machine, that older 4stroke is fine as a low maintenance load hauler for up a logging road or other established trail. Gifted horses and all that.

  2. #2177
    Join Date
    Apr 2004
    Location
    Creekside
    Posts
    1,166
    So time to bring this back up, what's everyone's plans for this winter? I am making do with the 2014 for one more year while I wait to see how the new AC 800 motor works out. Done everything to it that I am going to, and have three day weekends planned for all winter so plan on riding and sled skiing way more.

    Sled is a 2014 AC M8000 153 bumped to 162. 2016 36" front end, Powder Pro skis, 2016 rear, skid. Pro Climb running boards, Proclimn front Bumper, Skinz Rear bumper, C3 Belt Drive,Full Elka Stage 5, Bikeman Clutching and Sled Shed Cooker Can,

    Click image for larger version. 

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  3. #2178
    Join Date
    Dec 2010
    Location
    Vancouver Island
    Posts
    1,589
    Very nice. Running my '08 Summit 800 again this year. 2nd year of riding and really stoked on it.
    "...if you're not doing a double flip cork something, skiing spines in Haines, or doing double flip cork somethings off spines in Haines, you're pretty much just gaping."

  4. #2179
    Join Date
    Sep 2010
    Location
    Shuswap Highlands
    Posts
    1,469

    Maggot snowmobile thread

    Sweet! Just tore off the tarp and cover and opened a few panels, after walking the hound this evening. Upgrading the seat and a ski rack. '14 summit 600. No more sore back from an old Polaris Indy lite!

  5. #2180
    Join Date
    Apr 2004
    Location
    Creekside
    Posts
    1,166
    This will be my 3rd winter, last year finally got to the level of being able to ride well enough to really start getting into the places with good terrain . As well did more sled skiing and assisted touring. Want to get that kicked into high gear this year.

  6. #2181
    Join Date
    May 2004
    Location
    give'er eh!
    Posts
    1,234
    Im going to add to my collection of first ascents and descents on my 850.

  7. #2182
    Join Date
    Mar 2007
    Posts
    977
    So who knows about two-stroke engines? My question is should I get the top-end rebuilt this fall, or do a tune-up and keep it running on the old pistons for another year?

    My 2007 RMK 900 has been a champ as long as I've owned it and thrashed it. It's nearly 10 years old with about 2,750 miles on the engine. The engine has purred for years with minimal maintenance, although last year I noticed a slight variance in the throttle response. I tried doing a compression test on the pistons. The engine apparently has a 'decompression valve' that lowers the compression to allow it to be started with a pull crank. The left piston pulled up to 90psi when I pulled on the pull-start, but it bled off to 0psi. The right piston got up to 60psi with the pull start, then bled off to 0psi. I started it with the left piston running only and compression tester on the right piston, and got around 120psi with the right piston. Based on snowest forum pages, 90psi and 120psi are in the correct ballpark numbers. I didn't try running the engine on the right piston only to measure the left cylinder. I may try that tonight. There are cracks in the rubber throttle body connector. I've heard that can cause the engine to run funny so I'm going to replace it. I know I should do a top-end sometime soon, but lazyness has me thinking I should go another year as-is.

    Also, is anyone selling a used Cheetah Rack or similar?

  8. #2183
    Join Date
    Dec 2010
    Posts
    1,009
    I want to braaaap now!!!!

    Picked up a skidoo xm 163 t3 so I can climb vertical faces and huck huge cliffs. Or do I need a turbo to do that ?

  9. #2184
    Join Date
    Aug 2014
    Posts
    807
    Quote Originally Posted by simple View Post
    I want to braaaap now!!!!

    Picked up a skidoo xm 163 t3 so I can climb vertical faces and huck huge cliffs. Or do I need a turbo to do that ?
    I just what there to be enough snow so I can begin the process of learning to braaaap.

  10. #2185
    Join Date
    Mar 2006
    Location
    Trouserville
    Posts
    13,944
    Quote Originally Posted by Gerome View Post
    So who knows about two-stroke engines? My question is should I get the top-end rebuilt this fall, or do a tune-up and keep it running on the old pistons for another year?

    My 2007 RMK 900 has been a champ as long as I've owned it and thrashed it. It's nearly 10 years old with about 2,750 miles on the engine. The engine has purred for years with minimal maintenance, although last year I noticed a slight variance in the throttle response. I tried doing a compression test on the pistons. The engine apparently has a 'decompression valve' that lowers the compression to allow it to be started with a pull crank. The left piston pulled up to 90psi when I pulled on the pull-start, but it bled off to 0psi. The right piston got up to 60psi with the pull start, then bled off to 0psi. I started it with the left piston running only and compression tester on the right piston, and got around 120psi with the right piston. Based on snowest forum pages, 90psi and 120psi are in the correct ballpark numbers. I didn't try running the engine on the right piston only to measure the left cylinder. I may try that tonight. There are cracks in the rubber throttle body connector. I've heard that can cause the engine to run funny so I'm going to replace it. I know I should do a top-end sometime soon, but lazyness has me thinking I should go another year as-is.

    Also, is anyone selling a used Cheetah Rack or similar?
    Meh. It's a Polaris motor with vastly different compression between cylinders. It's fiiinnne. What could go wrong?



















    do a top end

    now
    Besides the comet that killed the dinosaurs nothing has destroyed a species faster than entitled white people.-ajp

  11. #2186
    Join Date
    Mar 2007
    Posts
    977
    Hehe, good point.

    Hey, is it as simple as it looks? Eight head bolts, a couple radiator lines, a couple electric plugs, and six exhaust bolts to get to the pistons? Then replace pistons, gaskets and torque bolts correctly? It looks like a couple evenings worth of work. Maybe easier than pulling the whole engine.

  12. #2187
    Join Date
    Mar 2007
    Posts
    977


    Ok, to answer my own question, I think it is as easy as it looks.

  13. #2188
    Join Date
    Apr 2004
    Location
    Creekside
    Posts
    1,166
    Assuming the cylinders are in spec and ,the crank is good. Way more work if you need to take it down to the crank.

  14. #2189
    Join Date
    Mar 2006
    Location
    Trouserville
    Posts
    13,944
    Yeah it's not that complicated. Just make absolutely sure you drain all the coolant and don't get any in the case when you pull the cylinders. Once you get the jugs pulled, keep a towel over the case because it likes to pull things in (like wrist pins and roller bearings). It seem like a pain in the ass as you figure out all the shit you have to disconnect but it all goes back together way faster.

    Use a torque wrench for the headbolts and follow the pattern when tightening. Unless you think you need to check the crank, there's zero reason to go beyond the cylinders.


    Make fashionable highball mugs out of the pistons when you're done.
    Besides the comet that killed the dinosaurs nothing has destroyed a species faster than entitled white people.-ajp

  15. #2190
    Join Date
    Mar 2007
    Posts
    977
    Yeah, I'm convinced, I'll change the pistons. I have no idea how to check the crank, but nothing indicates the motor has any major issues right now. Top end parts are about $300, which is cheap insurance for another 5+ years of abuse. I saw another video where the guy put paper towels in the crankcase to prevent losing the circlips and roller bearings too. He also measured the diameter of the piston walls and spacing of the piston rings. I assume I can get away with using stock pistons if the piston walls still look like they are in good shape. I have to look on my old computer to see if I have a pdf of the shop manual, otherwise I have to go search for the torque specs. Fun things to do with all the free time I don't have

  16. #2191
    Join Date
    Oct 2006
    Location
    Uber Alles California
    Posts
    3,576
    ah just blow it and spend 4k on a new engine like I did

  17. #2192
    Join Date
    Apr 2004
    Location
    Creekside
    Posts
    1,166
    Forget a new engine, new sled is where it’s at!

  18. #2193
    Join Date
    Mar 2007
    Posts
    977
    Haha, the new sled money was already spent on the new kid.

  19. #2194
    Join Date
    Mar 2006
    Location
    Trouserville
    Posts
    13,944
    Quote Originally Posted by Gerome View Post
    Haha, the new sled money was already spent on the new kid.
    You got the receipt still, right?
    Besides the comet that killed the dinosaurs nothing has destroyed a species faster than entitled white people.-ajp

  20. #2195
    Join Date
    Mar 2007
    Posts
    977
    Its the no refund or exchange policy that gets you every time.

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