just got a new buypass immoberliser as my scooter wunt start but wen i put it on it sparks every single time now and run perfect but it made a pop out ov the egzast an now its runin shit ??? still got a healthy spark an every thing else works fine can any 1 help >?
have a look at the exhaust gasket. it might have blown. that causes no back pressure and small engines need back pressure. try that. i had the same problem on my suzuki katana and it turned out to be that.
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Try fixfault.com to fix motorcycles.