CR125 idle/ starting problems...

sgoeb13 · May 2, 2004

A riding buddy of mine has a 2003 CR 125 that seems to have a few issues. He bought the bike new last summer and it has always been hard to start and wil not idle at all. Another friend of his told him that this was normal for a CR 125 so he is living with the problems. I'm sick and tired of him saying how much he hates his bike (since he loves to ride so much) and would like to get your guy's input on what to do to get his bike to idle and start well. He has an FMF pipe/ silencer and has never re-jetted (I know this is part of the problem but it never idled with the stock exhaust either), other than that the bike is stock. I think he's affraid to tear into the carb to re-jet but I told him I'd do it for him since I have no problem going through carbs. Please help me to get my buddies bike running well. Thanks for any input you can provide. -Steve

Jeff Gilbert · May 2, 2004

I think your on the right track Steve, sit on his head and make him let you re-jet it.

sgoeb13 · May 3, 2004

Any idea where to start with the jeting? Pilot, needle clip position, main, air screw? Most of my jetting has been done on 4-strokes. Is there an idle adjustment anywhere(thumb adjuster), I didn't see one when I looked really quick the other day. -Steve

_j0kA_ · May 3, 2004

on my 250 there is an idle screw, if you dont see one i think you can pull the choke knob up and turn it till you get the idle the way you want.. as far as jetting goes i would move clip position up one, then play with the air screw.. if it runs best above 2 1/2 turns i think you go to a richer pilot - if its within 1/2 turn you goto a leaner pilot

it should run quite a bit better, gl

darringer · May 3, 2004

I believe on that carb there is both an air screw for mixture adjustments and a throttle stop screw. To set the throttle stop, start the bike and hold the throttle open about an 1/8 to keep it running. And at the same time turn the throttle stop screw in (clockwise). What this does is not let the slide return all the way down, thus letting the engine idle speed adjustable. Keep adjusting to get the desired speed. After setting the speed, adjust the airscrew for best performance.

_j0kA_ · May 3, 2004

oh yeah, double check the float height to make sure its not getting exsessive/not enough gas

sgoeb13 · May 4, 2004

Thanks guys! I'll post the results after I get a chance to do some wrenching. -Steve

marcusgunby · May 4, 2004

koka , Nope its only on the really old carbs the choke acted as a idle screw as well.

kx134 · May 7, 2004

tell him its a pos and he should sell it to you for 5.00 and go buy a new CR125 that has a "good idle"

j/k, just hit him over the head and while he is unconcious, get that carb straightened out.

CR125 idle/ starting problems...

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