Question about 2003 Yamaha FJR 1300 A

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Backfiring through airbox

I got caught in the rain a couple of days back, and since then my FJR 1300 A has been backfiring through the airbox when I start it up, and then settles down after a while. Im not if the rain had anything to do with it at all tho.... When I start it up, sometimes it dies with the choke on (similar to flooding on 2-strokes), The engine sporadically does not respond to throttle, and if I turn the throttle, it halters and ocassionally pops through the airbox. The popping is not consistent on any one side airbox (and therefore I assume ..cylinder). Is this a timing issue? or has the wiring become wet coz of the rain? how can I resolve this, and since I plan to commute to work on this bike, how can I avoid this problem if it rains on me again?

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K.T.T moister can cause your bike to do most or all of the tings you said. Especially if your plug wires are cracked and worn. I suggest running some new wires and boots and use dialectic grease at the plug and up at the coil this will keep moister from buggering things up. Now if this doesn’t solve things then you might want to think about syncing your carbs. if you haven't already Checking your timing wont hurt as well.

Posted on Nov 10, 2008

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