clytle374

I just bought a used 100. It's got good compression and seems in good shape except for being a little dirty and having a lot of carbon on the exhaust valve stem when I look into the exhaust port. Is there anyway to de-carbon the engine without disassembling it? It is supposed to be relatively new and I don't want to reseat the ring. Kind thinking someone ran a high ratio of castrol oil in it.

Thanks
Cory