Hey man... Assuming you dont have an air leak- you're either running too lean, not enough shims, or plugs are not hot enough. Add a copper shim, go one step hotter on your plugs, or change fuel. You could also go with less nitro content on your fuel. Basically your plugs are getting too hot. This can be alleviated by reducing compression(add a shim), reducing nitro, or using a more heat tolerant plug. You could also richen your mixture.



thanks trey! it did start acting up when i took the break in shim out, i use 97t plugs, i tried a 77t and did the same thing, so i put the break in shim back in, (seems to run great with it in). going to also change front bearing today.