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Last consulted
SIP 3.0 valve for SI 27.23 carburettor for Vespa 160 GS / 180 SS
Price: |
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Item code: | 10977 |
cod. producer: | 59633000 |
Availability: | Available Available immediately |
Quantity: |
User feedback
Description
SIP 3.0 carburetor valve for Si 27.23 for Vespa 160 GS / 180 SS, CNC milled, hard anodizedNumbers (for comparison purposes) 5963.3 (DELLORTO)
VESPA 160 GS (GS4) (D) 160VSB1-2T2T AC`62-`64
VESPA 180SS Super Sport180VSC1T2T AC`64-`68
Throttle valve restricts the flow of air to the engine. Its degree of opening is determined by turning the throttle grip. The farther you open the more air can flow you will find. Some throttle slides have air pockets on the top side and cut sections (so-called "inserts") on the bottom side. These add extra air to the gasoline mix and make it leaner as a result. Flat-bottomed slides do not add extra air and are therefore ideal for compensating for a leaner midrange. To be able to meet the required emission values for the new PX, the SI carburettors that are currently available are equipped with a gas valve with two additional air pockets. This attenuates the mix such that partial load pinking and piston jams can occur on tuned engines. The solution to this problem is to replace the gas valve which is equipped with a thicker throttle valve without air pockets (e.g. part no 84.920.400).
Conclusion: The throttle valves are often overlooked when setting up the carburetor and are the icing on the cake in SI attunement.
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