Question about Yamaha DT 125 R Motorcycles

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Loss of power...

Just bought the scooter,been stood a while so ive been told.starts great revs great.when you pull off its ok for about 100+ yards then you have to let go of the revs and free wheel for a while then use the throttle again.ok for a bit..the more you travel the worse it gets,feels like its running out of petrol,buts it has a full tank.ticks over great a bit smokey though....cheers kev...

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Hi kev,

thank you for using fixya.

i'm a 2-stroke fan myself, all my bikes are 2 stroke. with the issue you currently have, i would say that the culprit will be the following.

1. carb mixture for oil, air and gas. you may need to have this tuned making sure that the 2-t oil is not more than the gas.

2. body {background-color: #FFFFFF;font-family: "Verdana"; font-size: x-small;} p { margin: 0px 0px 0px 0px; } overheating, there are many points for a 2 stroke engine to overheat even on in idle, one reason is too much oil or too little oil (transmission oil that is). when it overheats, the gas/oil/air mixture will be heated and too denced to burn, leaving it with low combustion and smokey burn.

best way to get through this is to check your piston and rings of any scratch for a possible blow by, and have parts replaced if possible. for the carburator, just set the timing and the tuning to 1:4:5.

should you have other questions, please let me know.



Posted on Apr 20, 2009


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