i have a speedfight 2 its a 100cc and 2004. it seems to tick over perfect fide around perfect but when i do the 17 mile commute to work it runs fine then starts to loose power when i pull the throttle any further than tick over and will not accelerate. The only way i can describe it is as if the its pulling ait through the carb as it still runs but just keeps loosing and power as soon as i go to full throttle but as soon as i release it its fine. please help i have a fair scooter knowlege and am good with ma hands and am willing to try any relevant suggestions...

Tom Caulton, April 2008

the bike is running weak ,in other words the fuel air mixture has too much air and not enough fuel check the vaccum pipe to the carb from the vaccum fuel tap is not spilt as ths is common on speedfights also check the flow of the fuel from the fuel pipe after sucking on the vacccum pipe (carb end)the jets in the carb may also need cleaning or the circlip on the slide needle in the carb may need to be moved further towards the pointed end of the needle.

adam, April 2008