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525 Rpm's

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Old 06-04-2007, 09:19 PM
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Default 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.
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Old 06-04-2007, 09:21 PM
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fuel pump??? I think there is an electric and a mechanical. Someone wiser will opine.
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Old 06-04-2007, 09:54 PM
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there is low feed and high psi for the injection it just runs fine the rest of the time it just wont turn up.
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Old 06-04-2007, 10:58 PM
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what are these engines suppose to turn at max rpm??
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Old 06-05-2007, 08:16 AM
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5450
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Old 06-05-2007, 08:26 AM
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4800-5200 is merc spec's.try 2" smaller props.you gain/loose 150rpm per inch of pitch
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Old 06-29-2009, 08:38 AM
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Default similar issue! what did you end up doing?

Quote:
Originally Posted by comininhot View Post
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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