i have a 96 xlt 600 and rebuilt the crank and pistons. i have 115psi in one piston and 125psi in the other two. the polaris dealer in my area which doesnt deal with snowmobiles told me that they should be 150psi. i have never heard anyone have that much, always thought 125 was good. anyway he told me that when my last piston went it scored the wall (which it did) but i honed it and seemed good. anyway he told me i need to send it in and have it replated. i have heard of guys boring this motor out. just didnt know if you can bore it and slap oversized pistons in it and walk away or if you bore it then replate it. i am having a hard time starting it. had it running and synced the carbs and ran it for awhile and parked it. then it never started again. i am about to scrap it but have to much time and money invested in it now. any suggestions are greatly appreciated. thanks
boring a 96 xlt
- Thread starter bestfib
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600cc? I've never heard of them having that kind of compression. I got one running mint at the house up north that I could compression test and see what I have, but I thought 120 was normal for them. I can say that anything about 130psi I've ever seen has taken 93 octane and ours uses 87 per the owners manual.
bouncer
Member
Compression is not causing your hard starting problems. 115 and 125 are good numbers. Would like to see them more equal but could be that far off because of a cylinder getting washed out with excessive gas.
I would look at carburation , ignition as the culprit.
They sell over size pistons for this engine so you would be able to re-bore. They did not come from the factory with plated cylinders.
and is not necessary.
I would look at carburation , ignition as the culprit.
They sell over size pistons for this engine so you would be able to re-bore. They did not come from the factory with plated cylinders.
and is not necessary.
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thanks all, i didnt think i was mistaken for the compression. can anyone tell me this, when i rebuilt this motor couldnt really tell if it mattered where the stator went, i put back the way it came off except the slotted hole could be off a little. would that make a difference? i have spark. i have to believe it is a fuel system myself and will be pulling all carbs and lines to re-clean them and start over with them. the fact that it ran and now it doesnt makes me believe that i may have clogged a jet or filter.
timing can (should) be checked with a dial indicator through the spark plug hole. mark the flywheel at the spec for that motor and use an auto type timing light to verify correct timing. It could be off a degree or two and still run, but would be hard to start and tune if too advanced. retarded a little and it will start nice, but won't perform as well as it could.
Needle and seats are prone to go bad on these motors, so replace them if you have not already.
Needle and seats are prone to go bad on these motors, so replace them if you have not already.