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  • Writer's pictureKai

Synchronising Carburettor Throttle Valves

Welcome to a mini tutorial on how to synchronise throttles in a carburettor after a complete rebuild using iron bearing balls.

Step one: Check the status quo

Step two: Adjust throttle 2 and 3 first.


Step three: Adjust throttle 1 and 4


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hey bud,


thanks a lot for posting such a good information,


whats the base point on the screws after replacing them,

should the butterfly be completely closed?? I understand carbs #2 & #3 should be in sync and take them as reference to adjust #1 & #4.


thanks !

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TB's numbering them 1 to 4, 4 being the TPS end.

Use 3 as datum/reference

the adjusting screw to the left of 4, adjusts 4

the adjusting screw to the right of 2, adjusts both 1 and 2 together.

the adjusting screw to the right of 1, adjusts 1

so do them 4, 2 and 1 all compared to 3


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