Question about 2002 Honda CR 125 R

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Idles great in gear no power

1978 cr125 where can we get a download manual?
What is the gas/oil mixture
runs great at idel revs up but put it into gear and take off it dogs right out Does not stall but no power. Stock jetting
top end is newly boared and match to piston/rings

Any help would be great this is my kids suimmer project bike and hope to point him in the right direction


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I could not find a free download. You can go to and probably purchase a manual there. Also Google "motorcycled repair manuals". If at all possible, only get a factory service manual. Haynes and Clymer are not nearly as helpful. Gas/oil mix should be 32/1. That's 4 ounces of 2 stroke engine oil per gallon of gas.

ALWAYS have a fire extinguisher on hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a plug on the bottom of the carb float bowl. Remove the plug then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Pay special attention to the main jet. Check the main jet, the stock jet is #360. Remove the idle screw on the outside throat of the
carb and also the air screw on the intake where the air filter attaches. Spray into the screw holes as well.
Be sure to put these two adjusters back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the slide back in the throat of the carb but move the clip on the jet needle to mid-range. Put the rest of the
carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. If the problem is still present, remove the exhaust pipe and try again. The exhaust could be restricting the flow of burned gas out of the cylinder. The only other thing would be the crank seals. Post a comment to get back to me.

Posted on Jun 16, 2009


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Loss of power...

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.



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