running rough

81 Honda CM 400 T discussion forum:


running rough

running rough 
mojoe said 2007-11-05 17:50 
 
I have an 81 400cm and it ran good till about a week ago. I now have to let it warm up for about 5 minutes before I can ride it or else the left cylinder will miss fire and run like crap till it gets good and warm. Also, it will run rough if I give it slow throtle after it is warm, but if I give it a hard throtle, then it runs fine. Any suggestions as to what it is and what I can do about it. 
 
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