Modern Vespa : Primavera carb problems

Primavera carb problems

OP danie UTC details Hooked '57 VN2, '70 180 Rally, '80 P150X, '80 P200E, '13 GTS300 Joined: UTC Posts: 420 Location: George, South Africa
OP danie Hooked '57 VN2, '70 180 Rally, '80 P150X, '80 P200E, '13 GTS300 Joined: UTC Posts: 420 Location: George, South Africa	UTC quote On a SI carb, the air screw is normally turned out 1½ times. Does the same apply to a SHB carb? And how do you ensure that no air leaks past the felt washer between the carb and the intake manifold? I have "soaked" the washer in grease, but it does not seem to work.

MJRally UTC details Veni, Vidi, Posti 73 Rally, 76 ET3, 80 P200, 61 Ser 2, 65 Silver Special Joined: UTC Posts: 5353 Location: Oceanside, CA
MJRally Veni, Vidi, Posti 73 Rally, 76 ET3, 80 P200, 61 Ser 2, 65 Silver Special Joined: UTC Posts: 5353 Location: Oceanside, CA	UTC quote Welcome to the miserable world of smallframe air leaks. Voodoo put a trick up about sealing the slits in the carb/ receiver with grease on the felt ring. I took it a step further and found the only way to eliminate air leaks for a bit (not foolproof) is to use some gasket sealer/RTV on every junction/gasket.

nomadinsiam UTC details Ossessionato Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E Joined: UTC Posts: 2563 Location: Siam
nomadinsiam Ossessionato Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E Joined: UTC Posts: 2563 Location: Siam	UTC quote MJRally wrote: I took it a step further and found the only way to eliminate air leaks for a bit (not foolproof) is to use some gasket sealer/RTV on every junction/gasket. I got so tired of the felt ring and did the above, but went one step further and got rid of the felt ring altogether. It has worked well so far for many miles.

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