When idling, the engine peaks then drops over and over. I've rebuilt carburetors and cleaned the tank and fuel lines.
SOURCE: Buell blast is backfiring. Sat for 2 years so,
If you did not completely disassemble the carb and remove all jets/emulsion tubes/needle valves then you did not clean the carb adequately. You could try adding either Seafoam, the Yamaha CARB-CL-EAN-ER, or Techron fuel system cleaner in an auxiliary gas tank and running the engine for a short while to ensure the mix gets into all the nooks and crannies. Let it sit for a couple hours to do the work, then drain out the float bowl, hook up the bike's gas tank and see what happens. Otherwise you need to remove, strip, clean, reassemble, and reinstall the carb.
SOURCE: Eratic idling and misfiring under pressure
confirm that the fuel pump delivers the proper pressure to the injectors
SOURCE: 1997 skylark tries to stall on take off & idles rough, & misfire
Waited for engine to cool and checked all vacuum hoses and sensors, according to vacuum diagram and found a couple of dry rotted hoses. I replaced them and troubles went away.
SOURCE: High Idle On Start-up.
Most fuel injected motorcycles do start up in a "fast idle" mode. Although I don't know much about fuel injection on Harleys (H-D will not tell you much about it unles you are one of their technicians), I don't think the system is equipped with an engine temp sensor. Since the crank case sensor get it's pulses from pockets cut into the outer edge of the left side flywheel half, the sensor will have oil on it.
SOURCE: High idle on start-up
Its your idle senser sits on top of the manifold u will see it looking at u when u take off air filter cover. Little black plastic.plug in.
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