Question about 2007 Yamaha Ybr 125
Are you sure the 2008 YBR even has a carburettor ? I thought the YBR went fuel injection from 2007.
If you can't afford to have it looked at by a garage, you need to buy the Haynes manual. They're very easy bikes to work on, and you'll just have to learn by doing.
Could be dirty fuel, dirty lines/carb/throttle body - check your fuel filter if you have one, and no harm to clean out the tank anyway.
Could be the plug is knackered - check the gap, and that it isn't messed up and sooty, could be the plug cap.
Could be the electrical side - start the bike on the stand, and give the big bunch of wires in the rubber jacket (behind the headlight) a good wiggle around. I had a problem there with a connector block melting, and the bike wouldn't go at all til I found it.
With the bike idling, spray something like WD40 or carburettor cleaner all around fuel intake side, esp where there are any rubber sleeves etc - if the bike revs pick up, you know there's an air leak somewhere. That would cause rough running at idle.
You need the manual ! Best of luck.
Posted on Sep 12, 2010
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Posted on Jan 02, 2017
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