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96' Mach Z

647 views 1 reply 2 participants last post by  Free Air 
Sounds like you are running lean on the top end. Check your spark plugs. Do a "clean cut". Rap it out for about 30 seconds, top speed, then hit the kill switch. Check the color of the plugs. If they are white, you are dangerously lean. Boost bottles are a poor mans supercharger, they have little to do with jetting. They must be carefully designed for the engine in order to work right. Kind of like an expansion chamber exhaust, but it's on the intake..

If you are lean, WHY are you lean?

Main-jet to small, install larger main-jet.
Main-jet plugged up with gum, clean carb.
Carb running low on fuel, filter clogged, pump faulty..
Carb loose or rubber mount cracked open allowing air leak into engine..
 
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