Gy6 labor knocking
 

Ok so i rejetted my crossfire since its been getting colder and now its started randomly labor knocking? Went from a 130 main to 135.

Tried a higher octane fuel?

Im going too but if it was gonna labor knock it should have done it ever since it was rebuilt and running leaner.

Here is the list of mods...

Crossfire 150
Uni filter
Some sota ebay glasspack style muffler off a buggy at the junkyard
60mm jug with HC piston
Big port head with SS valves and titanium springs
A-12 cam
135 main
38 pilot
12g sliders
yellow clutch springs
yellow contra
custom oil cooler

Is it actually getting enough fuel though? Might still be lean from other reasons.

try going back down to the 130, the 135 might be to big

ill try the 130 again just to make sure the knock goes away.....it should be getting plenty....its got a big riding mower tank with 1/4in lines and a big clear glass filter.

muffler may be the prob.

same muffler ive had on it for months.....that whole list of stuff was done a few months ago and its been running like a top till the weather changed

Update....93 octane gas has seemed to fix the issue.....and ive acquired a rare and mythical factory 26mm cv carb off a 75 buck carter brothers 150cc buggy