Bogging with black Spark Plugs
2000 Rebel. No acceleration. Crank the throttle and it dies - in neutral or under load. Replaced the gas and cleaned the jets - no change. The plugs show a very rich mixture - both are the same. If I add choke, it only gets worse so it's obviously over rich, but how??? It can't be the accelerator pump system with black plugs. If it was the needle and seat, it should run fine for a sec or two after the carb rebuild, as the fuel bowl fills, and besides there's no evidence of flooding through the air filter with the engine off. The air filter is brand new, so no problems there.
Is this some sort of choke issue? I understand the choke is not like a typical one (a flap that cuts off the air). Can it be choking with the choke off? Bike sat for 2 years...
Any help would be appreciated.