www.iFourWinns.com

Hey, I brought up prop first! I want a cut of the $ - Then I'll share it to help get his prop reconditioned.

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2001 Horizon 260 - 7.4 Volvo GSI DP

WELL ,the waether wasnt good today ,strong winds and rain ,so hopefully tomorrow I will test out the revs using the remote fuel supply,I had another idea as well,probably a long shot ,but...what is the chance of the problem being a rev limiter? just a thought?

The Electronic Control Module has a rev limiter ( when the GM V8 engine is used in trucks it is set at 5,600 rpm I believe). If that is the problem, it would limit it to the same RPM in and out of the water.

Graham

My boat had a problem even planing off, when ethanol was added to the fuel here, the problem turned out to be a corroded anti-siphon valve on the gas tank. The engine would rev normally in neutral in the water but would not pull the boat up on plane. Then I found that the prop on it (14.5X19) only let it pull 4000 rpms, so I switched to a 15x17 and it pulled the proper rpms after that.....

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88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

Pull out a spark plug, take good pictures of it. That will tell us what the engine is doing.

If it's really white, it's running lean (fuel issue).

If it's clean and goldish, it's running correct.

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1981 Columbia 8.7
2015 Yamaha FZR - 87mph - sold
2006 Yamaha GP1300R - sold
2003 Chaparral 215 SSI - sold
2009 Stingray 195CS - sold
2000 Four Winns H180 - sold
1976 O'day Daysailer II - sold
Rick's Four Winns H180 Mods/Upgrade Thread

The knock sensors won't let it run lean, they'll limit RPM to the point when there is no "knock" ( preignition). At 4,000 rpm or whatever it may well be running OK as far as the mixture is concerned.

Kiwi- hope you don't mind we are having fun at your expense trying to help figure your puzzle out. It's cold, snowy and nasty up here. We have to do our boating thru you during these months so we want it fixed too.

Keep us in the loop.


(my guess is still lower unit/prop related)

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2001 Horizon 260 - 7.4 Volvo GSI DP