Reply To: GT125 2003 Performance Issues

[Mike Daborn]

Hi,

I have stripped and clean the carbs again. I installed the pilot air screws and opted for 2 1/2 and 2 3/4 turns front to rear. The pump appears to work but when I attach the pump to the carbs the bike dies. If I go direct from a mobile fuel unit to the carbs the bike idles and revs  like a dream without the airbox fitted or the carbs clamped to the manifolds. I checked the plugs and both are very sooty so I guess I need to later the pilot screws maybe a quarter to half a turn each?

I don’t understand why the pump appears to work but the engine dies when it is connected.