NC50 Oil in Combustion Chamber / Leaks from Exhaust

I just came upon a 1980 NC50 and after a few days of work, got it to run today. My guess is that it is the first time it had run in five to ten years. When it started, it was bogging hard, spitting oil from the exhaust, and when I shut it off, I noticed it was dripping from where exhaust meets combustion chamber. There is also oil in the combustion chamber, I then realized. Not good.

It is very much a project bike, but I am wondering what's next.

Thanks

Re: NC50 Oil in Combustion Chamber / Leaks from Exhaust

Could just be a buildup. I would see if it burns off. Does it have oil injection? If so, check the lines for drippys...

Had a Hobbit once that was completely filled with oil...got it to idle and let it burn off while blipping the throttle for a while...cleared right out....had I planned on keeping the exhaust I woulda pulled it off and cleaned it tho...

Re: NC50 Oil in Combustion Chamber / Leaks from Exhaust

yeah chances are if it had an oil injector that the seals failed and dumped the oil into the case and exhaust. you can run it to flush it maybe. same thing can kinda happen if gas leaked past the float seal and filled everything up and just slowly thickened as it evaporates

Re: NC50 Oil in Combustion Chamber / Leaks from Exhaust

thanks for the replies... turned out to be build up. i rebuilt the carb, cleaned points, changed plug n battery, replaced fuel lines and tuned the carb and now she purrs.

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