The large type
KAVAN carburetor uses a pressure release to stabilize the
fuel tank pressure when you transition from high speed to
At high speed the
fuel tank pressure builds up and then when the engine is throttled
back to an idle, the input pressure from the exhaust is reduced.
During this period while the pressure is stabilizing, the
idle mixture tends to be rich and leans out slightly as the
Configure the fuel
tank with 3 lines. Two vent and one pick up. Connect the fuel
inlet to the klunk line (pick up line) in the tank and the
pressure release line to one of the vent lines.
Hook the other
vent line to your muffler pressure.