Idle mixture for Keihin butterfly

Idle mixture for Keihin butterfly

This is the "Idle mixture screw" for H/D Keihin butterfly carburetors.

Made to order by KEYSTER PRECISION WORKS LTD.

This is a convenient hand-adjustable screw for CV carburetors that was previously available from YOST in the US, but the butterfly version is no longer available.

This is a special item made to order by Kishida Precision Works Ltd., a long-established carburetor manufacturer made in Japan.

The same dimensions as the original, the adjustment part (usually only adjustable with a small flathead screwdriver) is an original 8mm hexagonal shape that is a good guide for the return amount when adjusting and can be adjusted with a flathead screwdriver.

It is the right length, shape, and size to easily adjust by pinching it with your hand.

The O-ring is made of the same rubber material as the alcohol-resistant needle (commonly known as the AA Needle), which was developed independently by Keyster (Kishida Precision Works Ltd.) under a patent.

For all of you who have been struggling with the settings of Keihin butterfly! Buy it now!

[Additional note on compatibility]
We apologize for the addition and correction that this product cannot be used or installed on the very early types.

Only for this very rare early model, which has a very small number of existing models, the shape of the mixture part (including the carb body and the mixture alone) is completely different from the butterfly carbs from after that.

It is more like a Bendix or S&S carb, with the mixture body exposed and able to be turned either by pinching it with bare hands or with a screwdriver, and no O-ring is used, only a spring.

The shape of the tip of the mixture is also very simple, with a taper angle... more like an air screw.

Please check the actual vehicle if you have a 1976 vehicle before ordering.

For carburetors from 1981 onwards, the carburetor is originally blinded, so please use a slide hammer or drill to remove the blind cover before use.
The carburetor screws are delicate, so we recommend having them done at a professional shop.