Jump to content
Sign in to follow this  

CR 125 bogging??

Recommended Posts

My 2003 CR 125 is bogging a little. Like when you are turning or almost stopped and open it all the way it bogs but when you give it like 3/4 throttle and wait till the revs get up then you can open it all the way. Is this normal on 2 stroke bikes?

Share this post


Link to post
Share on other sites

My dad said the powervalve was kinda stuck or something when we did the top end. Ill ask him again but he oiled it and said it might loosen itself up. could this be the reason?

Share this post


Link to post
Share on other sites

They don't loosen up they get tighter from carbon buildup. The valve needs to be removed and decarbonized. Might as well put in new rings or new piston and rings while in there.

You may also want to richen up your A/f screw and see if that helps the bog at all.

Share this post


Link to post
Share on other sites

My guess is that the pilot or needle clip is rich maybe both. Didnt really understand where the bog was in your post. If it bogs off idle when you crack the throttle that indicates a rich condition on the pilot.

Share this post


Link to post
Share on other sites

Ill go out and ride it again wednesday and pinpoint exactly where it is. My dads a mechanic and we have a service manual anyways. Would it bog if i was in second? Because i cant really remember what gear im in. Sorry if any of this doesnt make any sense

Share this post


Link to post
Share on other sites

It could... but I weigh 230 lbs before gear and still rip around the track on my 125 and it never bogs. Takes a ton of clutch work to keep the RPMs up at times but I can take the gate in 2nd gear without it bogging. So Id say no it shouldnt really bog. The symptoms you describe dont sound like a PV issue to me but anyways, Im willing to bet theres a 90% chance its a jetting issue.

The best way to pinpoint exactly where the bog is is to put a peice of tape on your throttle housing and mark your throttle fully closed and fully open and measure the distance between the two marks and mark 1/2 way and then half way from the mid point to the closed mark and half way to the open mark.

Share this post


Link to post
Share on other sites
My 2003 CR 125 is bogging a little. Like when you are turning or almost stopped and open it all the way it bogs but when you give it like 3/4 throttle and wait till the revs get up then you can open it all the way. Is this normal on 2 stroke bikes?

We had a 2003 Honda CR125...quite possibly one of the best bikes we ever had!

We used Maxima Racing USA Castor 927 oil w/ high octane race gas in a 32/1 mix w/ a ProCircuit Pipe. Keep the power valves clean..very clean. Keep the air filter clean, change often. You might have to go up a size or 2 on that main jet but we never done anything. May not be of any help but just some info for you.:smirk:

Share this post


Link to post
Share on other sites

I dont think its a jetting problem because when we got the bike it wasnt bogging, but i dont know what octane gas they were using. I also crashed and my bike flipped and stuff, thats when i kinda started to notice it. Would that mess anything up?

Share this post


Link to post
Share on other sites

Im using regular pump gas and mixing 32:1. Ill email the other owner and ask how high of octane gas he was using

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

×