My 89 yamaha exciter has a bad bogging problem after half throttle. If i hold it right at half itll hit about 50-60 but if i go anything morr it just bogs down to about 4500 rpm and stays there. Ive cleaned the carbs about 4 times and have cleaned the fuel pump. All the vent lines are fine and flow freely. It has a new coil pack. But one sparkplug is a dark brown and the other doesnt seem to have much color. They both are new but this one is black and white. I cant think of anything else to do! Anyone have any suggestions??
Just a thought, but put new tank of gas in. If gas is old and has been in tank a while it losses some of its spark. I had a similar issue and found the gas was bad. New gas and problem solved. It's worth a try, unless you've already done so.
the choke cables are frozen in place and icant pull them out. i think they are rusted and could it be the float height in the carburator bowls? i went and bought 8's just to tune it the mixture without it fouling then ill go back to 9's
got them out, cleaned them up, to start it i had to gap the plugs at .010, starts hard and only one plug is coloring. i used a timing light to verify and i dont have spark on the clutch side. the coil pack is new also so i am stumped