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won't rev past 2250

KraZ
in Help Me !!

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I just bought my first Z - a 1980 28 zx. It ran great until I washed it. Now it won't rev past 2250 rpm. It bogs and won't do anything until it goes down to about 1500. Anything under 2250 it runs great. What can I check? It has new plugs/wires, new fuel filter. How do I check fuel pump? or does this sound like ignition? How do I check the coil? Thanks for any help:ermm:

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