Question about 2003 Honda CRF 150 F

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2003 Honda CRF150F problems

I recently let a friend ride my 03 honda crf150f while I was gone, he said the bike just quit on him. When I got back I changed the spark plug and filled it up with gas, it wasn't fresh but has probably been in the can for a month or two. Now when I hit half throttle all the way to full throttle it sputters (for lack of a better description). Could it just be the gas or do you think there is a bigger problem? Would 101 octane damage the motor if I run it in this bike? Also do you have any suggestions for exhaust and aftermarket parts to gain a few more horses for a reasonable price?

Thanks,
Clif Tinkham

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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. 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.
Put 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. Pay special attention to the noted area. A “very helpful” rating for this answer? Thanks!

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Posted on Jun 26, 2009

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The reason why you probally fouled a plug because 03,04 hondas had bad valves you need to check your vavle clerance my sponsered rider rode a honda that we always had to replace the plugs in at 30 dollars a peice his was a 250f but same differance u need to check your valves and adjust your air screw the brass flat screw in the under the carb in the front after you drain the bad gas out of it..... good luckl

Posted on Jun 27, 2009

  • thomas foster
    thomas foster Jun 27, 2009

    no 101 octane would not hurt it at all they tell you to run at least 93oct as far as power goes playing with that air screw will get it dialed in exhuast is always a good first step but you need to get your problem sta8end out 1st

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