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-   -   help Rpms all over the place (https://www.offshoreonly.com/forums/general-q/158230-help-rpms-all-over-place.html)

osen007 05-14-2007 07:01 PM

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.

monstaaa 05-14-2007 07:17 PM

hows the ignition system?

jeff1000man 05-14-2007 07:22 PM

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.

PatriYacht 05-15-2007 07:13 AM

Check engine grounding.

jeff1000man 05-15-2007 08:33 AM


Originally Posted by PatriYacht (Post 2128067)
Check engine grounding.


Ah Yes


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