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1980 XS1100 restore

Motorcycle repair forum -
Hey all, long time lurker. Finally decided to buy a bike and I've been enjoying bringing it back to life. My only concern is there is an audible sound and drop in RPM everyonce in while when being started cold. I have a few other fuel related issues that are related to cracks in the carb boots so I don't doubt it could be caused by that (I'm getting the new boots tomorrow anyways) but want to know if anyone else has an idea? I'm going to guess it's a lean condition causing some kind of misfire and it hangs the rpms.

Goes away completely once warm, goes away completely at above ~1500 RPM, doesn't come back until engine cools down and the cycle starts over.
Date: Jun 19, 2017   

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