Tham Posted June 23, 2006 Report Share Posted June 23, 2006 I'm currently using a 3K Aisan carburetor on my 4K engine. This carb doesn't hold idle very well, and I think it's partly due to the return spring, which is built into the throttle linkage, unlike the 4K carb which uses an external spring hooked to a bracket on the manifold. I'm thinking of switching back to my previous 4K carb, which has a hot idle compensator, which is basically a bimetallic strip. This compensator introduces air into the intake manifold at higher temperatures and leans the mixture, and thus gives a smoother idle too. The currrent 3K carb does not have this compensator. However, I undertstand that a lean mixture makes the engine run even hotter, so I wonder if that might be a problem. Quote Link to comment Share on other sites More sharing options...
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