slow jet / idle jet - 50/120 for Vespa 125-200cc
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slow jet / idle jet - 50/120 for Vespa 125-200cc
slow jet / idle jet - 50/120 for Vespa 125-200cc
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This is the smaller jet that screws in next to the main jet stack. It regulates fuel/air mixture at the bottom 1/3 of the throttle. A combination of the idle jet and the main jet handle the middle 1/3.
If your idle jet is too big or too small, it can create a "flat spot" in the acceleration. Idle jets have two numbers. The first number is the size of the bore that allows fuel in, and the second is the size that allows air in. So a 45/120 jet would run richer than a 45/140, because the 120 allows less air to pass. To make things more complicated, some vintage Vespas came with "plugged" idle jets, which have no air hole. Item 775929

Suitable for:

VESPA 125cc 1959 - 1966
Vespa Super 125cc 1965 - 1969
Vespa GT 125cc 1966 - 1978
Vespa P125X 1978 - 1981
Vespa 150cc 1958 - 1960
Vespa 150cc 1960 - 1967
Vespa Super 150cc 1965 - 1979
Vespa GL 150cc 1962 - 1965
Vespa Sprint 150cc 1965 - 1979
Vespa PX150E 1981 - 1906
LML Star / Stella 150cc
Vespa Rally 180cc 1968 - 1973
Vespa Rally 200cc 1972 - 1979
Vespa P200E 1977 - 1982
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