Question about 2004 Honda CR 125 R

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I have a 2004 CR125R that i baught in 2006 brand new it has less than 20 hours on it. ever since i've got it, it hasn't liked anything other than high rpm/powerband...if im just riding along at low rpms or sitting idling, then it fouls the plug,...I have the manual for it, and have every standard carburator part (main jet, slow jet, etc) and every carburator adjustment set to standard,...32:1 fuel/oil standard mix with premium gasoline, Motul 8 premix and standard NGK BR9EG spark the book nothings wrong, but trying to ride anywheres tells me otherwise...does anyone know of similar problems with similar dirtbike, or the solution to this problem?

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Reason is pretty common as these 2 stokes and all 2 strokes they really only designed for one thing - Wide open throttle ! Race track performance. short bursts of flat out to clear all fuel and oil enough to idle through tight corner then straight into wide open throttle again.
Some alternatives for you to try would be lean out the fuel air screw just tiny amount 1 / 8th off a turn in. See if bit leaner setting helps your low RPM a bit also you could consider less oil in the fuel mix 32:1 is pretty high on oil. Most would run these at around 40:1 at the track you don't need to make big changes just adjust to 36:1 first just to check the results - you will soon know if is improvement or not ?
Only change one thing at a time then test ride or you will never know the right direction if the change helps then great but if no change or worse, put it back to original setting and try something else until you find the right direction If the bike is at its best flat out then there cannot be to much wrong thats actually perfect really! so just some very fine tuning should get you where you want to be - Good luck! regards Jamie

Posted on May 27, 2011

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I have a 2004 CR125R that i baught in 2006 brand new it has less than 20 hours on it. ever since i've got it, it hasn't liked anything other than high rpm/powerband...if im just riding along at...

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