Weak throttle response
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Seriously though, it sounds like your air filter is not flowing well. It could also be venting too much blow-by oil into your intake.
1. Try cleaning the filter.
2. Make sure your crank case is not too full of oil.
The Best of Harley-Davidson for Lifelong Riders
"During hot idle, or when the motorcycle is
off-throttle and running at hot temperatures,
EITMS shuts off fuel to the engine’s rear
cylinder, leaving it to idle on the front
cylinder only. Without combustion, the
rear cylinder and exhaust header will begin
to cool, bringing relief to the rider (and
passenger) soon after. Once the rear cylinder
cools to a predetermined temperature, or as
soon as the rider accelerates, both cylinders
resume operation. And by maintaining
constant rpm during rear cylinder
“shutdown,” transitions between one and
two cylinder operation are nearly seamless.
EITMS is purely for rider comfort. When it
activates and “shuts off” the rear cylinder, it’s
not because the motor is overheating. It’s
designed to reduce the heat radiating from
the rear cylinder to the rider"


