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comininhot

06-04-2007 08:19 PM

525 Rpm's

I have a pair of 525 efi's one will only turn up 4500 with new plugs and and all new filters any help.

UNSANE

06-04-2007 08:21 PM

fuel pump??? I think there is an electric and a mechanical. Someone wiser will opine.

comininhot

06-04-2007 08:54 PM

there is low feed and high psi for the injection it just runs fine the rest of the time it just wont turn up.

mels277

06-04-2007 09:58 PM

what are these engines suppose to turn at max rpm??

gsmith9898

06-05-2007 07:16 AM

5450

dollerparts

06-05-2007 07:26 AM

4800-5200 is merc spec's.try 2" smaller props.you gain/loose 150rpm per inch of pitch

Eschneider

06-29-2009 07:38 AM

similar issue! what did you end up doing?

Quote:

Originally Posted by comininhot (Post 2150834)

I have a pair of 525 efi's one will only turn up 4500 with new plugs and and all new filters any help.

I am experienceing same issue on my formula 400 with twin 525's - 1 of my engines will only throttle up to 4000rpm. i was thinking fuel filter as the other engine runs fine. How did your sutuation resolve itself?

Any feedback would be great!

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