I'm pretty sure I damaged my pistons the other day because of overheating on my 08' Polaris Dragon 800. Moderator BC Dan told me that these sleds are infamous for top-end problems, so I decided to tear it down, and sure enough there seems to be a lot of scoring on the pistons.
To give some background about what happened. I did not warm my sled up. I took off from the parking lot and was hammering it pretty good. About a mile in my engine bogged down but the sled was still crawling. After I came to a complete stop the pull start wouldnt budge, so I assumed that the engine had seized and the piston rings or piston had melted to the cylinders.
Once I pulled the top of the engine off, the pistons moved up and down freely. I was expecting them to be melted. Is this typical? If I had let the sled cool down for a while would I have been able to restart it?
I also posted some pictures of pistons, cylinders and crankcase/rods. Would you guys mind telling me if anything other than the pistons need to be replaced. I do not feel scoring inside the cylinders that my finger nail catches on, but the pistons have significant scoring that I can. I plan on buying one of the Fix Kits available for the Dragon per BC Dan's recommendation.
Another mechanic also suggested that I bore the cylinder heads out to 860 and replace with a oversized piston head. Is this a good idea? I wouldn't mind the extra power.
Any advice is greatly appreciated!
Thanks!
To give some background about what happened. I did not warm my sled up. I took off from the parking lot and was hammering it pretty good. About a mile in my engine bogged down but the sled was still crawling. After I came to a complete stop the pull start wouldnt budge, so I assumed that the engine had seized and the piston rings or piston had melted to the cylinders.
Once I pulled the top of the engine off, the pistons moved up and down freely. I was expecting them to be melted. Is this typical? If I had let the sled cool down for a while would I have been able to restart it?
I also posted some pictures of pistons, cylinders and crankcase/rods. Would you guys mind telling me if anything other than the pistons need to be replaced. I do not feel scoring inside the cylinders that my finger nail catches on, but the pistons have significant scoring that I can. I plan on buying one of the Fix Kits available for the Dragon per BC Dan's recommendation.
Another mechanic also suggested that I bore the cylinder heads out to 860 and replace with a oversized piston head. Is this a good idea? I wouldn't mind the extra power.
Any advice is greatly appreciated!
Thanks!
08 Polaris Dragon Top-end replacement
0 commentaires:
Enregistrer un commentaire