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350xrider911
02-17-2008, 05:27 AM
today i took apart the 86 modle and found it had a higher comprison piston. it doesnt look like the one, in my 85 it has, a 10.25. but i ran the numbers its a wiseco pro lite saying its a 12.1. but its got the same size pop up on my 85. and its bored .50mm i thought you could only go .40mm but the head gasket anit the same. my 85 it metal with and, the 86 wasnt. does the it cuz there difent years. some one replace only the exauste valve guide seal but not the intake, those were trashed they were plit. and the intake vlave was realy sharp. ill try and post ome pics. later of every thange

Dirtcrasher
02-17-2008, 12:12 PM
If you weren't running race gas with a 12:1 piston then that explains the poor running and the split seals were letting oil in there. Is the top of the piston black??

350xrider911
02-17-2008, 02:28 PM
it had alot of carbon builed up. but i dont know how long it was ran.