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Thanks for the ideas chaps. I have cleaned the tank out and tried new fuel. Will try taking it out for a run and see how bad it really is, just sound…login to view the rest of this post

Yes might be worth a go. Just not sure if it's the early stages of something more catastrophic. Thanks for the replies

Yes checked all the cables and caps. Tested the Sparks too all look strong. Wonder if poor valve clearance would cause such a problem?

Hi my 4xv started ok after a year of lying up and with a new battery fitted, it idles fine when it's warmed up, but defo sounds like it's off a cylind…login to view the rest of this post

Hi everyone I'm new to this forum but was on the old one for ages.
I have always found the Yamaha forums really helpful in times of need. My 4 year project is my much loved 4xv 1998, ex race bike which I'm slowly putting back onto the road, nearly there. I have loads of pics which I will post later ...