rubbersdown
12-11-2010, 12:08 PM
My bro in law has a 99 400ex. He just did the rings on it and its running very odd so he dropped it off to me and said "fix it" lol.
It starts up just fine but tics kind of loud and the throttle has a really hard "thump" in it when the bike is running, almost like its pushing back and resisting. When the bikes off the throttle feels normal but when running it feels like something is hitting the carb or something, its a pretty hard thump. I have never personally felt this before. Anyone have any ideas? My first guess is that maybe he put the cam in 180* out and its backfiring out the carb and thats why I can feel it in the throttle? Although it seems that if the carb was out 180 that it wouldnt start?
It starts up just fine but tics kind of loud and the throttle has a really hard "thump" in it when the bike is running, almost like its pushing back and resisting. When the bikes off the throttle feels normal but when running it feels like something is hitting the carb or something, its a pretty hard thump. I have never personally felt this before. Anyone have any ideas? My first guess is that maybe he put the cam in 180* out and its backfiring out the carb and thats why I can feel it in the throttle? Although it seems that if the carb was out 180 that it wouldnt start?