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R1ffR4ff · 06-01-24, 08:50 PM

Yes. Failing or failed Petcock and float heights incorrect/stuck. Has happened to me on one of my old Hondas with CV carbs when the bike was left on the side-stand. The fuel also got past the inlet valves and contaminated the oil. You could smell the petrol in the oil from the filler hole and caused a vapour-lock/hard turn-over.

I drained the oil and replaced it with some cheap 20w50 and ran that for a few mins and then dumped it. I repeated this again and the put proper oil in with new filter . I did not want any bottom-end shell contamination that could ruin the engine.

You may be lucky and no fuel in the oil but if not see above.

06-01-24, 08:50 PM	#20
R1ffR4ff Member Mega Poster Join Date: Feb 2017 Location: JAMOADR(1999 Curvy) 36,000 miles Posts: 1,434	Re: running on one Yes. Failing or failed Petcock and float heights incorrect/stuck. Has happened to me on one of my old Hondas with CV carbs when the bike was left on the side-stand. The fuel also got past the inlet valves and contaminated the oil. You could smell the petrol in the oil from the filler hole and caused a vapour-lock/hard turn-over. I drained the oil and replaced it with some cheap 20w50 and ran that for a few mins and then dumped it. I repeated this again and the put proper oil in with new filter . I did not want any bottom-end shell contamination that could ruin the engine. You may be lucky and no fuel in the oil but if not see above. __________________ "Stultus est sicut stultus facit"