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Could you have carburetor icing? Started the CG250 yesterday, and it did not want to run w/o the choke. Kinda felt around the carb, and it was cold. Put my hand on it to maybe warm it a bit, felt the fins on the cylinder and the head, both chilly, but warming up. Took a while to get it to run properly.
I have done nothing except swap in some roller cam followers.
I do note that it seems the clearance gets bigger when the thing is finally warmed up. I did not listen close when it was cold, but it seemed louder by the time I got home.
The CB with OHC may not do this, but will be subject to needing the carb warm as they all are vaporizing liquid(fuel) and that takes heat. I have not ridden in temps as cold as this so it is kinda new to me.
tom
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