[Rich Biebel]

It's pretty difficult to describe and is a lot to disassemble. The entire generator end has to come apart. A service manual might help but you'd be better off taking it to a professional, like me that is familiar with them. It's not a simple deal to take it all apart and know what you are looking for. I work for a generator service company in Dover, NJ. I do all the RV work so I know those machines very well. I don't race at Island and have not for years. What racing I do is usually in S/C at various races and tracks. Maybe there is an Onan repair place somewhere in your area. You could buy a service manual online but it's not real helpful for a repair like this. There really is no other way to check this other than disassembling it to verify the timing indexing is either good or bad. A new rotor may be needed if the pin broke as it is not repairable. Parts availability is a possible issue but should be available.