No top end unless its going up hill.

Denis Zen

Active Member
Mar 30, 2021
143
177
43
Riding up highway 101 at sunset
I recently changed carbs on my 80cc anbull bike motor and cant seem to get the motor to run smoothly at full throttle UNLESS i am going up a slight incline then it runs smoothly until the load is gone then back to rrrrraaaaattttttt.

The bike idles fine and runs smoothly until I get to the last 4th of the throttle and it just blahhhh. I live 58 feet above sea levels

Ive taped up where the carb and manifold connect so Its not an air leak. Ive played with the sparkplug gap, no help. My bikes getting plenty of gas. (Checked fuel filter and gas line.) I use Husqvarna oil mixed at 30- 40% and fires right up first kick.

Should I try swapping the jet from the old carb or what? This is driving me crazy!
 
  • Like
Reactions: fasteddy

Nightster

Well-Known Member
Mar 3, 2021
735
1,720
93
58
Texas
Sounds like it could be a jet issue, maybe some others will know more. But since you’ve checked everything else I would focus on the jet at this point
 
  • Like
Reactions: fasteddy

Denis Zen

Active Member
Mar 30, 2021
143
177
43
Riding up highway 101 at sunset
I replaced the carb because it was supposed to be good to go with out any
adjustments and an auto choke.

I havent replaced or changed any jets so far. I am still messing with the spark gap. I have 5 sparkplugs and I am systematically going from 23 to 28 and so on. So far it doesnt seem to make any difference at top end.

This is what leads me to believe its a jet problem. I even changed magnetos in case it wasnt producing enough spark. And same thing.
 
Last edited:

Denis Zen

Active Member
Mar 30, 2021
143
177
43
Riding up highway 101 at sunset
Oh I am running a niome flex tailpipe also, could that have something to do with it? I could swap to the stock one but I dont like my tailpipe riding 8 inches off the ground .

I am going to try the tailpipe swap just for sh*ts and giggles.