had the ped out today, its not been run for a few weeks, so i didnt expect a comfy ride lol. but anyway, for a few miles it ran fine, no popping or backfiring and driving very well. then i stopped at the petrol station, filled up, then drove out, after reaching full throttle and about 40/45mph, it was popping a little bit, then gradually more and more. . it didn't lose much speed so its not that bad, just a jerky ride and sounds shit. can anyone shed any light before i tear it apart and check everything, just to find its catch 22 and obviously the last thing i check. btw, as some may know, one of the bits of the front variator fan pulley has broke, this may help you, as im stumped, it cant be a jet issue i dont think. link to video on my twitter, follow me if ya like @Bill_Silkstone bill.
It could just be something simple first of all replace spark plug clean carb out and check for air leaks in the manifold
I would go with Jonny on that one. If ped was left aside for a while you should have changed the petrol that was in it before starting it :/ Purge the fuel line and clean the carb and that should be you done