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Originally Posted by Tomcat13t
I want to do a needle shim modification but don't want to ruin a good thing. My GZ tops at 83 and can pull me and my girlfreind around on the highway with little to no problem. I have noticed a little blueing on my muffler, right at the begining. I read that it means its running a little too lean but I don't know if just a little is normal.
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You may not need to shim the needle unless exhaust or intake is modified.
You likely just need to do a idle mixture adjustment. (pilot jet) They are set extremely lean from the factory to pass emissions.
:cool:
