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Yes it could be fouled plugs. I had a set of plugs give me a fit. The bike would not run .It was winter and I just installed big carbs so I figured it was just because it was winter.
Then when it warmed up it would not run and the bike always runs fine.
I pulled the plugs to check spark . First I held the plug on the side of the engine. and cranked the engine.The spark was not at the electrode. I could see th esparks down inside the insulator.
This is the odd part.When I ungrounded the side of the plug the spark moved to the tip.
I got another plug and it did not act that way, I put the new plug in and the bike ran fine.
Seeing light is good .I would still run a wire or a jet reamer through it just to scrape the hole clean.
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