Engine Trouble i have no clue

bart3ckyy

New Member
Local time
6:17 PM
Joined
May 4, 2024
Messages
3
Location
Poland
i have a problem with my 80cc 2t engine, i do a porting/head grinding/reed valve/banana exhaust with a welded unlocked elbow from the original muffler/carburetor mikuni 24.
and my problem is from 0-40km/h power like stock and with 40+(vmax 54) its farting from exhaust like gets to small gas but spurk plug is ok. i tried with pz 19-phbg 21 with all of nozzle and nothing
and my friend with only porting/head grinding goes 67km/h and has more power from starts

i dont know whats could it be
pls help
 
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