RPM's?

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07-19-2009, 11:24 PM

footchopper

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RPM's?

How many RPM's should I be turning on my 7.4 (carb'd) Bravo 3. Formula 252, currently runs 54 on GPS @ 4300.

07-20-2009, 01:44 AM

Griff

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It should have the WOT operating range right on top of the engine. I think its 4400-4800 or so, maybe 4200-4600???
Spin it as close to the top WOT # range as possible to make the most power.

07-20-2009, 02:18 AM

Boat Tech

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The mercruiser service manual said your rpm range is 4200-4600 rpms. And also if you still have the stock flame arrestor it might tell you what the max rpm would be.

07-20-2009, 11:46 AM

footchopper

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Thanks

07-27-2009, 09:33 PM

footchopper

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New Plugs!!!!!!!!!!!

Today I went and changed my spark plugs to the factory recommended AC Delco plugs. I also changed out impeller assembly. Now I was running WOT @ 4950 RPM's !!!!!!!!! Must have had a bad NGK plug. Not sure, but it runs awesome now.