www.iFourWinns.com

What should the max rpm's be for this engine? It seems I've lost a little top end. Have changed the fuel filter and the engine runs great, no missing, idles and starts fine. Prop has been reconditioned.

Thanks

4600-5000 RPM.

Here is a link to where you can download "Fast Facts" and catalogs: http://www.fourwinns.com/customer-service-catalogs.aspx

Owners manuals: http://www.fourwinns.com/customer-servi ... nuals.aspx

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NEW - 2000 Cobalt 246 w/454 Magnum 385HP | SOLD - 2000 FW Horizon 180 LS w/5.0Gi 250HP Volvo Penta

Thanks

It would help if you post which boat you have including year and also the prop you have.

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NEW - 2000 Cobalt 246 w/454 Magnum 385HP | SOLD - 2000 FW Horizon 180 LS w/5.0Gi 250HP Volvo Penta

230 four winns horizon. It's DP, not sure of pitch.

What year?

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NEW - 2000 Cobalt 246 w/454 Magnum 385HP | SOLD - 2000 FW Horizon 180 LS w/5.0Gi 250HP Volvo Penta

2005. Sorry trying to do two things at once. Work gets in way.

According to the Fast Facts, a 2005 230 with the 5.7GXi DP should have the F5 propset and hit a top speed between 48-51 MPH. The full throttle operating range should be 4600-5000 RPM.

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NEW - 2000 Cobalt 246 w/454 Magnum 385HP | SOLD - 2000 FW Horizon 180 LS w/5.0Gi 250HP Volvo Penta

Thanks that's what I saw also. I don't believe I'm getting that high of rpm.

Looking for what could be causing the lower rpms at full throttle. Motor runs fine, no hesitation, no start or idle problems and changed fuel filter.

I try a couple times a year to give a brief WOT run to verify I can hit the factory expected RPM and speed. I do this as it is my check to make sure everything is ok but to achieve my expected RPM and speed I do have to make sure the underside of my boat is clean and I need to trim the drives out quite a bit over normal cruise trim to achieve the factory expected numbers.

What is your maximum RPM and speed that you get now? Is your boat bottom clean and did you trim your drives to obtain maximum speed?

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Current Boat
- 2001 Four Winns 328 Vista "Hour Decision"
- 2010 310 Mercury Inflatable

Previous Boats
- 30' Doral Prestancia
- 25' Doral Citation

Bottom is clean, waxed before storage and did trim.

rpm is probably 4100-4200
max speed 41 or so.

not a big deal but just curious to why loosing the rpms and speed. did have lower unit work done to it last year, bearings and seals.

I'm heading to lake this weekend so I'll take her out by my self and make sure their isn't any excess weight and try it again.

Thanks for your input guys.