I recently had a kx-85 cylinder overbored 2mm and ported to improve the power and powerband. I then installed a new topend using a wiesco topend kit.On the first ride after break-in, the bike ran o.k. but seemed to be running rich on the topend.On the next trip to the track i went from a 135 main to a 132 main based on what several other's were running in thier kx-85's but i was using a br8eg plug and it was a very hot day , we experinced a minor siezure after letting the bike cool down it was fine and it was fine upon inspection. The next time at the track i went to a br9eg plug and the bike ran extremely well for several hours of riding although it was a cooler day.Today we went back in the heat of the day with the same setup and although it didnot sieze it sounded and acted like it was going to before we stoped running it.The topend is still in good shape but, it seemed to be makeing a grinding noise just before we shut it off. I will probable try to call Eric tomorrow but thought maybe someone may have an idea what to look for ,try , or do .
sorry to be so long,THANKS!!
sorry to be so long,THANKS!!