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Discussion Starter · #1 ·
Have a 2012 z400 quadsport, fuel injected, with a terrible high idle. The engine has got a standard bore cylinder but a vertex high compression piston in it. Everything else is stock.

I have messed with the idle screw but changing it does not affect the idle no matter what I do.

Does anyone have any experience with this kits and have advice?
Do I need additional parts to get it running better?
What am I missing here?
Any help is much appreciated!
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