Jump to content
Sign in to follow this  

XR75 idleing when hot problem

Recommended Posts

A small prob with my XR75. When I start it it runs and idles ok, as it gets warm I have to turn the throttle stop in more and more to keep it idling, until it reaches the end of its travel and thats still not enough to keep it running. Ideas anyone?

thanks

Share this post


Link to post
Share on other sites

It could also be a worn out needle and needle jet as a 75 will have a lot of distance on it now.

Share this post


Link to post
Share on other sites

the cylinder and rings could just be worn and when it gets hot the ring end gap increases and u loose compression, do a comp check when hot, then put a little bit of oil down the cylinder and do it again, usually as an engine warms up the idle goes up. also what color is ur plug it could simply be you are running to rich so it runs good when cold b/c it is like a choke.

Share this post


Link to post
Share on other sites

It also could be the ignition system breaking down. By system, I mean any one part of it, the stator, coil, wiring, points, condensor, etc. . I'm going to put a cdi on mine, if I would stop being outbid on Ebay. 😢 I would start with a new, yes "new" carb, then go from there.

Share this post


Link to post
Share on other sites

the cylinder and rings could just be worn and when it gets hot the ring end gap increases and u loose compression, do a comp check when hot, then put a little bit of oil down the cylinder and do it again, usually as an engine warms up the idle goes up. also what color is ur plug it could simply be you are running to rich so it runs good when cold b/c it is like a choke.

Its just had a rebore, new piston/rings, so that should be fine. If its running too rich, how do I lean it up? Sorry, I'm sure its simple but I'm no expert on old machinery.

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  

×
×
  • Create New...