help Rpms all over the place
#1
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Join Date: Feb 2006
Location: Saint Clair Shores
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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.
#3
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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.