my squab 50cc scooter will go very slowly with very low revs but when u rev to actually get anywhere the revs cut out and it goes down to idleing again.it took me 1 and a half hours to go 3 miles to work.ive put a new exhaust on,and carb.its been in 3 different garages who charged me 200 in total to tell me they cant find anything wrong with it.help!!!
check main jet to see if its clean.you should be able see through it.also check size. it should be at least size 72. if not . a new one will cost around £5.
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Try fixfault.com to fix motorcycles.