Question about 2006 Honda CBR 125 R

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Cbr 125 struggling and cutting out on me when driving!

Hi i have a problem with my 07 cbr 125. When i'm driving on the road sometimes the bike jerks and struggles to keep going, sometimes it completly cuts out on me and it can take a few good turns to get it started again.Then, when i try to give it a wee bit of throttle it doesn't rev right and trys to clunk out on me again.

It can take a good minute or two to start responding right again, but after a while of driving it will struggle and clunk out again. I took it to a mechanic and he says it was the wrong spark plug but after replacing with a new one, it is still happening.

There is a new performance exhaust system fitted to the bike about 2 months ago and i thought that it might be affecting it somehow because the bike backfires on me a lot but it has been fine up until now!

Any advice would be very helpful, Thanks!

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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 screw on the lower side of the carb float bowl. Remove the screw 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 try to 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. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws 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. Before putting the slide back in the throat of the carb, move the clip on the jet needle one notch lower. 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. This process should get you back on the road.

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Posted on Jun 18, 2009

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Look under the gas thank there is 2 pipes check to see if they are in correctly then check the overflo pipes.

Posted on Apr 29, 2011

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