Other XR400R no rev problem

so today I went to ride my bike and I noticed it was hard starting and didn't seem to have as much power as it should. But I rode it anyway and halfway through the ride I hear a loud pop and then my bike immediately went to struggling to run above an idle. It idles fine but when you twist the throttle it coughs, sputters then eventually dies I'm curious as to what this might be can anyone help me?



Side note I can't seem to post the video up here I will continue to try.
 
Last edited:

SRAD97750

Moderator
Staff member
When I had this problem with an XR400, it was the choke causing issues where it would idle but not rev or run.
Also the float level was really finicky to get it to run right. Just my short experience with an XR400.
-BIG DAN:thumb:
 

SRAD97750

Moderator
Staff member
I also was missing this oring on the idle mixture screw and it caused many problems for idle tuning.
s-l400.jpg

-BIG DAN:thumb:
 
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