I thought I have run into every problem that could happen with the 80 (69cc) china motor.
I have fixed my motor with the help of the great people on this forum, but I am stumped this time.
My motor has been running great after many bugs were worked out. It has been dependable transportation to and from work. I just hit 1,100 miles and then after a good ride to work, it started hard, and had no power going home. I did one thing at a time (learning the hard way, not doing too many things and get lost) to fix the problem. This is the list of things I tried. After each one I did a test ride with no improvement.
I put a new plug, I checked for air leaks, I checked motor mounts, I cleaned carburetor, I tried another carb, I tried fresh gas, I checked the exhaust for blockage, I pulled the head and checked for carbon and scratched cylinder walls, replaced the rings. I bought another motor and it runs great, (so there is no drag from the bike causing power loss.) I hate to trash that motor, but more important is, I would like to figure the problem out so if I run into it again I can fix it. I was thinking of ordering a head and piston for my next step. I can't see where the power could have went, It is such a simple motor, and it looks in good condition.
I have fixed my motor with the help of the great people on this forum, but I am stumped this time.
My motor has been running great after many bugs were worked out. It has been dependable transportation to and from work. I just hit 1,100 miles and then after a good ride to work, it started hard, and had no power going home. I did one thing at a time (learning the hard way, not doing too many things and get lost) to fix the problem. This is the list of things I tried. After each one I did a test ride with no improvement.
I put a new plug, I checked for air leaks, I checked motor mounts, I cleaned carburetor, I tried another carb, I tried fresh gas, I checked the exhaust for blockage, I pulled the head and checked for carbon and scratched cylinder walls, replaced the rings. I bought another motor and it runs great, (so there is no drag from the bike causing power loss.) I hate to trash that motor, but more important is, I would like to figure the problem out so if I run into it again I can fix it. I was thinking of ordering a head and piston for my next step. I can't see where the power could have went, It is such a simple motor, and it looks in good condition.
