Anything`s possible at this point but a whole bunch of symptoms point to the mixture being way too rich:
-sooty plug
-hesitating coming off idle
-misfire/bogging past half throttle
-idle mixture screw does next to nothing. Fully closed the engine dies, other than that setting has little effect
-exhaust fumes reek of petrol
Based on my studies of late ALL of these symptoms can be explained by a too big pilot jet, and remedied by fitting in a smaller one.
the kids made sure I never made it to the garage to try running the quad without the exhaust but based on my findings so far I`m fairly certain the answer here is a smaller pilot jet, which I will be ordering once I send this post. Results to be reported come next weekend.
__________________
2004 Longjia Grido 50 scooter
1999 Cagiva Mito 125 Evo, Yamaha XV125 engine, Ducati SS fairings, getting turboed
1993 Yamaha GTS 1000
Ex:Bashan BS200-S7 `07 Streetfighter-quad
|