20 Most Recent 2004 Honda CR 125 R Questions & Answers

compression range is 120-160 ok but anything under 120 needs top end,if not you will start to where on those cylinder walls with the ring

This sounds like a problem with "idle mixture" There is usually a simple screw with a spring around it on the carb to adjust it. With the engine running warm and idling, be sure that the choke is wide open, and turn that screw in (clockwise) a half a turn. From there, fine tune clockwise to the point that the engine runs rough or 'surges' . Then back it out counterclockwise ¼ turn. That usually gets the fouling and poor running back to normal.

First thing to check is spark if O.K try fuel drain tank clean out carb re-fill with fresh fuel try it again good luck

There should be a screw in the carb body turning this in raises the tick over turning out lowers it normally. Check the throttle cable[s] adjuster is set correctly. Also check that the throttle action is free running if the cable is not well lubed this can prevent the carb slide from seating at the proper level inside the carb. Some bike have adjusters on the carb top make sure this is not keeping the slide from seating. If you get somewhere fairly quiet open the throttle about half way and let go you should hear a metallic clink as the slide seats on the stop.

When the motor stops can it be started straight away and is OK for a time then stops again? Or do you have to wait then it is OK to start again? Could be water has got somewhere it shouldn't. Can sometimes be the fuel tank is not breathing, check the breather pipe or hole in or under the fuel filler cap to make sure they are not blocked. Water is great at blocking these if the tank don't breathe the fuel don't flow. Also check the kill switch and small switch on the clutch lever (if fitted) that prevents you starting in gear.

I don't think so because if there is a problem with spark plug bike will not start, Even if it start then you will not get proper throttling. Check your Ignition coil if this coil is weak then you will get this problem

if you got a locking tab that you bend lugs up to stop nut moving then 30 to 40 lbs will do ! P...

This could be any number of things, stuck throttle cable, idle set too high or stuck choke butterfly. Give these a check and you should at least have an idea where the problem lies.

i have a Honda CR125R 2004 , i tried the NGK B9ES but i found that the motor was flooding the plug and killing the plug , so i am using a higher burning plug which is the NGK B7ES and i have not had any further problems with it

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

Hi i had the same problem with a 2003 rm 250 and it was the crank shaft oil seal i replaced that on the clutch side and i put in a new plug and took it out it was spiting oil for bout 10mins of riding and then it was fine so maybe try that seal hope tht helps