Hey all, Today was the first day that we could get out and ride here in MN, so we got a good 10 inches of fluffy powder to play in. A few of us took a ride, and after about 5 miles we were going through an open field, so I opened her up on some harder pack and caught up to the group. While I was at full throttle (approximately 10 seconds) , she popped, and then acted like she fouled a plug. We pulled the plug on the clutch side, and I noticed a nice hole in the piston right below the spark plug.
I tore it down, and the cylinder looks to be ok, so I know I need to get a new piston/rings, but is there anything else I need to look at so this doesn't happen again? The sled has about 550 miles on it, has been raced in the past, and to my knowledge, has never been apart before. It had about a gallon of older fuel in the tank, but I topped off the rest of the tank with fresh gas. It's jetted with 260's, which I think is ok...temp here was about 30 F, with elevation less than 700 ft.
Running NGK BR9ES spark plugs.
Any advise as to what may have caused the failure? Does not appear to be a lot of carbon in the chamber, so I don't think it was that, but I really don't want this to happen much, as we only seem to get one good snow a year here.
Thanks for any help you can offer.
I tore it down, and the cylinder looks to be ok, so I know I need to get a new piston/rings, but is there anything else I need to look at so this doesn't happen again? The sled has about 550 miles on it, has been raced in the past, and to my knowledge, has never been apart before. It had about a gallon of older fuel in the tank, but I topped off the rest of the tank with fresh gas. It's jetted with 260's, which I think is ok...temp here was about 30 F, with elevation less than 700 ft.
Running NGK BR9ES spark plugs.
Any advise as to what may have caused the failure? Does not appear to be a lot of carbon in the chamber, so I don't think it was that, but I really don't want this to happen much, as we only seem to get one good snow a year here.
Thanks for any help you can offer.