I have a 21 TE300i with a riot 120. I rode it the first year with no trouble. Before the start of the second season I put in a new piston at 100 hours. 10 hours later, the piston seized, had some scratch on the sides and the ring caught the exhaust port. Bored and nikasil the top, 10 hours later another piston fail. Had it bored/nikasiled to match the piston to be sure it wasnt too tight. Rode it 5-10 hours at the end of the season. Put 10-15 ours on the dirt, on the 2nd winter ride, I lost the piston again.
Each time has been on groomed trail leaving the parking lot riding on hard groom. I make sure its warmed up and not too hot, this time I looked a the temp guage when it had issues and I was at 190 (I am told this is warm but not a problem).
Any thoughts on what could be happening? Am I running too long on hard pack in a high gear? It does have a high compression head (0-6000') but I am riding around 6000+. I have ridden it pretty hard in deep stuff without issue. Plugs looks med/dark brown. I have the Injectors moved back to the intake and a Coober ECU.
Each time has been on groomed trail leaving the parking lot riding on hard groom. I make sure its warmed up and not too hot, this time I looked a the temp guage when it had issues and I was at 190 (I am told this is warm but not a problem).
Any thoughts on what could be happening? Am I running too long on hard pack in a high gear? It does have a high compression head (0-6000') but I am riding around 6000+. I have ridden it pretty hard in deep stuff without issue. Plugs looks med/dark brown. I have the Injectors moved back to the intake and a Coober ECU.