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Author Topic:   30-inch Shaft on 25-inch Transom
onlyawhaler posted 01-03-2013 12:58 AM ET (US)   Profile for onlyawhaler   Send Email to onlyawhaler  
I have a friend up here in Utah that I have been converting over to Whaler for years and he finally [bought] a NICE used 1996 21 Outrage without an engine. He has been out with me on mine for years and we finally have a convert.

This 21-foot model is similar to my [1999] Outrage 20 in many ways in the layout, but comes with a generous 300-HP limit on the capacity plate. Because of altitude and ego, we want to go for the maximum horsepower and still keep on a used-re-power budget. A new engine isn't in the running, so we are looking in the used market

He has Yamaha rigging on it and I am pushing him to find a late model 2005 Yamaha 300 HPDI that has the updates and certified low hours. Those seem to be the trouble free ones of that model and era. We have found one with 197 certified hours. It looks mint out on the East Coast. It is a 30-inch shaft, however, and his Outrage takes a 25-inch shaft. Those 300's in a 25 inch shaft are much harder to find mint, and we would like to make this one work if we can.

Does mounting this potential 300 on a simple transom plate that elevates it 5-inches make this whole thing come together? Seems like a simple fix. I appreciate any comments?


Peter posted 01-03-2013 02:02 PM ET (US)     Profile for Peter  Send Email to Peter     
Probably does. But I thought those 21s could take twin 25 inch shaft outboards so that a 30 was needed for a single?
Tom W Clark posted 01-03-2013 03:33 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
The 1996 Outrage 21 came standard with a 25" transom. Whaler offered a 30" Transom option for 25" dual motors or a single 30" motor.

The easiest way to accommodate a 30" engine on a 25" transom is with the CMC 5" vertical extension: Static-Height-Plates/CMC-Static-Jack-Plate-5-inch-vertical-extension

If you use a set-back jack plate, it will have to accomodate more than 5" of vertical lift.

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