I have an 85 moto 4 200 that seems like it misfires and looses power when under a load. Example first gear all ok, second gear all ok, third gear at 3/4 throttle going through snow or up hill it starts loosing power and miss firing. It did this before i rebuilt the top end, replaced and rebuilt the carb, and put a new plug in. I have also installed a new gas tank due to other problems.

I also noticed that when cold, it idles fine. but as it warms up i constantly need to speed up the idle or it will die from idling too low.

Im thinking possible weak coil, but i would like to know what all you think before i go throwing parts at it.


Thanks
Mike M

 

Hmm ok