Hello everyone!

so another newbie and not surprisingly I need advice. My 09 xt660r is suffering from surging. It hasn't always been like this and has only suffered since I had the coil replaced at around 1500 miles. I've tried increasing the co as instructed somewhere on this site which hasn't worked. Ive looked at the idle speed but it doesn't sit at one figure in fact its up and down like a yo yo. Is this normal? Should the idle speed sit at a constant figure? Any suggestions will be welcomed. This is my 2nd xt and I don't understand why when I bought it it was fine and now it surges more than my old 05 model.

Dave B

idle should very much be constant.

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Hi

hmmm as I thought. Any suggestions as to what could be causing this? I guess this could be the cause of the surging if the revs are up and down?! could it be the replacement coil that yamaha fitted?

If that is all that has changed since the surging started then I think you have answered your own question. Unless you were a fly on the wall when the replacement was fitted, you have no way of knowing what was actually done.

I guess I know that but I was hoping it would be something I could sort without having to go to the dealer. They're so full of it and I don't believe they know what they're talking about especially when I asked them about this problem and their answer was "it might just be how it is" I've learnt more today from this foum and trust it far more than any dealer.

Thanks everyone!

OK, questions,

Why was coil replaced ? Was it replaced for new ? Did the issues start right after ? Are they consistent or intermittent ? Cold or hot issues ?

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