Questions & Answers for: DT 125 R yamaha motorcycle runs rough

Wont start bought a second hand 2002 model 2 days ago on the test ride bike was observed to run "lumpy" but was told that the bike had been used very little in the last year and just needed a good run

I have a yamaha 125cc.that will start but won't stay running. more details please. 1. if it starts can you rev it 2. how long does it run for 3.can you start it every time after it stops

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...runs good at low revs. HOWEVER at about half revs it feels like it hits a rev limiter and starts to run rough and no power left. I disconected the gear box speed sensor this stopped the rough running ...

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i also have a dt 125 96' model do you have both valves half open or one right to the the bottom and 2 right to the top for bottom end power ? cheers danny.. just bought a dt125r the power valve has ...

problems with Yamaha dt125r motorcycles Hi, John for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or ...