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| Re: Twin Su tuning |
Subject: Re: Twin Su tuning
by ddgonzal on 2013/1/23 20:47:56
Those are Hitachis rather than SUs. They only use one of two springs, so it's much easier than an SU. The lighter spring is used on A-series. L-series engines used the heavier spring.
You do not need a tool to meausure vacuum, you can stick a piece of hose into each carburetor and listen to the sound. Adjust the balance screw until the sound is even.
If that is a stock A14, the stock A12GX carbs should run well on it.
To identify the needle, remove it by taking out the set-screw. The number is stamped on the thick end. M83 was the original GX needle
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