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Author Topic:   Yamaha 4-stroke Short Shaft on 15-inch Transom
fdm posted 08-22-2002 03:52 PM ET (US)   Profile for fdm   Send Email to fdm  
I recently purchased a 25-HP four-stroke, short shaft, tiller, Yamaha. It quit running twice before the dealer told me water was coming up through the exhaust into the cylinders and that I needed to raise the engine on plates or build up the transom. First I find it hard that this would happen, but the dealer said there is a directive out now and that this is a problem on the short shaft motors. Has anyone else had this problem?

I've seen the T & H and CMC extensions mentioned here. Any comments on these or others?

Currently the cavitation plate is even with the transom bottom, but the dealer says I can probably raise the engine two inches without problem even though the owner's manual says don't go above the transom bottom. Appreciate the help.

JBCornwell posted 08-22-2002 05:00 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
I do not believe your dealer, FDM. If what he says is true, Yamaha would have recalled the engine and fixed it.

Either way, I would take the issue to Yamaha.

Good luck.

Red sky at night. . .
JB :)

Peter posted 08-22-2002 06:28 PM ET (US)     Profile for Peter  Send Email to Peter     
I agree with JB's assessment and don't believe that is happening. But if that is truly happening then you have a warranty claim against Yamaha because the product has a major defect.
jimh posted 08-22-2002 08:11 PM ET (US)     Profile for jimh  Send Email to jimh     
I am confused by your description of the outboard engine as "short shaft". How long is it? In inches, please.
lhg posted 08-22-2002 08:36 PM ET (US)     Profile for lhg    
A short shaft is 15". That puts a powerhead pretty close to the water under certain conditions, but as mentioned, the engine design should allow for it, even with the engine trimmed all the way in. I've never heard of this problem before with a 13' Whaler using a 2-stroke. Assuming you're dealing with a 13' "blue" Whaler, I'd have him swap you out with a 20" engine, and get the lift plates to raise it up to a 20" transom height. BW recognized this problem in 1992 with the 20" transom change. Let's see how Yamaha stands behind their products on this one.
jimh posted 08-28-2002 03:24 PM ET (US)     Profile for jimh  Send Email to jimh     
It would be good to keep track of this situation. Many people are looking for 15-inch shaft engines to re-power older Whaler 13-foot hulls.

If this Yamaha engine is not suitable then it should be noted and avoided.

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