What is the cruising RPM for your 4JH2TE?...

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scott wilson

Clogged air filter?

maybe it is a suffocation rather than starvation problem. Scott
 
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Terry

Scott, the engine reaches 3800 rpm in reverse...

gear and about 4200 in neutral. If it were air starvation it would limit RPM in any gear, IMHO. Several replies to this thread as well as Yanmar Help desk seem to think it is fuel. I still need to do the test and post the results. Terry
 
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scott wilson

Terry, I missed that info

and agree with your conclusion ruling out air flow. Scott
 
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Terry

Scott, no problem. With so many posts on this...

thread and so many helpful suggestions, I'm hoping that that is the problem and not something else going on with the engine. Terry
 
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Bradley Cavedo

3100 on ours with 17 inch two blade

We have flex-o-fold with maximum pitch [I think it is 15?] and 17 inch folding prop. 1997 P42 with turbo 63 HP Yanmar. cruise at 3100 rpm. 7.8kts with clean everything. Max rpm in forward is 3750. I don't know what it will reach in neutral.
 
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Terry

Bradley, do you know what size fuel lines you...

have, 1/4 or 3/8 inch ID? Terry
 
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Terry

Bradley, do you know what size lines that...

you have on your boat, 1/4" or 3/8" ID? Terry
 
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