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help Rpms all over the place

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Old 05-14-2007, 07:01 PM
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Default help Rpms all over the place

new motor 509/550hp big block chevy,1.50 grear bravo drive,2000 awsome 260fx 26 foot cat, no throttle response-climbs to rpm slow/ also rpms are all over 4100-5100, my msd box is set for 5600 im running a 24 pitch prop tops 71mph on gps, and everyone else is running a 28 pitch prop with 500 hp running 80's on gps, any ideas I changed the carb from a 950 to a 750 just to try no change so i put the 950 back on, no back fire at full throttle.
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Old 05-14-2007, 07:17 PM
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hows the ignition system?
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Old 05-14-2007, 07:22 PM
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Timing is off. And or, weak coil, Bad MSD box, Springs loose or worn out inside distributor. Probably should have that engine set around 32 degrees total.
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Old 05-15-2007, 07:13 AM
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Check engine grounding.
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Old 05-15-2007, 08:33 AM
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Quote:
Originally Posted by PatriYacht View Post
Check engine grounding.

Ah Yes
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