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thats should help on that my ct90 just needed carbs cleaned

not sure never had to time mine maybe some one can help on that but mini ran rough till i rebuilt the carb i clean it with Yamaha carb clean if you cant get it at a local dealer then order it here Yamaha Carburetor Cleaner 32 oz. - ACC-CARBC-LE-NR not sure if they ship outside the usa if you get...

sounds like your timing is off by 1 or 2 degrees also take the carb apart and clean good make sure all the jets are clean and see if that helps and replace the points and condenser

ive got 2 both 1975 and there 90cc and i love them i can get mine up to about 60mph pretty fast i go trail riding with them

my suzuki trail hopper with a lifan 138cc got to 81mph on the race track