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1969 16'/17' is a 25" 6hp kicker too long?
#1 Print Post
Posted on 05/19/17 - 11:26 AM

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Joined: 05/06/13

I have a 1969 whaler Tashmoo or Bass Boat hull and the kicker mount placement
on the transom is 23" to the bottom of the hull (due to the slope of the transom and angle of the hull is 22 1/2" and 23 1/2" over an 8" spread).

There is a 4 stroke 6hp about 90 minutes from me with the high thrust sail prop and alternator. It has the ultra long 25" shaft. Is this doable? At least on the later Montauks a 20" is recommended. I did find a chart online that indicated on 18"-22 1/2" transoms a 20" shaft was recommended but 22 1/2" + transoms a 25" shaft was used.

I do not really want to buy or build a mini jack plate and wish to thru bolt this kicker. I believe I could shim it up an inch with HDPE plastic before bolting it on.

Will this kicker work for me? Or should I look for a 20" shaft kicker. This motor is a year old and the $400 saved over new could go for a gps/fishfinder.

The boat is used on Lake Champlain.

Thank you for your advice!

(fixed typo in year)

Edited by Joe Kriz on 05/19/17 - 11:31 AM
Joe Kriz
#2 Print Post
Posted on 05/19/17 - 11:33 AM
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Can't be a Tashmoo or Bass Boat model as they weren't made in 1969.

Regardless of the model, all kickers for the 16/17 Classic models were 20 inch long mounted directly on the transom.
See page 11 of the Owners Manual for 9-17 foot Boston Whalers in our downloads section.

Joe Kriz -
1977 Montauk 17'
#3 Print Post
Posted on 05/19/17 - 2:48 PM

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My bad, the registration says 1972, my memory isn't what it used to be.

I stated in my post that The manufacturer recommends the 20" shaft. But at 22 1/2" transom the chart I found stated 22 1/2" was the border for 20" shaft vs a 25" shaft.

As my transom is right at 22 1/2" I was wondering if the 25" shaft is doable, shimmed up an inch.

Alan Gracewski
#4 Print Post
Posted on 05/19/17 - 2:57 PM
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SF: At the speed you are going with the kicker, another 5" of engine length will not make any difference. Outboards are specified for length based primarily on having enough lower unit in the water for the propeller to bite, but not so much that additional drag results. If you wanted to go 20 knots, you should stick with the recommended length. However, you will be going 5 knots or less so it is not any big deal. I personally would not even bother to shim it up.

The only down side I can see is the extra length will increase your working draft with the engine down. If you are not going to run in very shallow water, this probably does not matter to you.


Joe Kriz
#5 Print Post
Posted on 05/19/17 - 4:59 PM
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I suggest to everyone to follow what Boston Whaler suggests and prints in their documents.
Everyone please read page 10/11 of the Owners Manual for 9-17 models under Auxiliary Engines.

I can think of a couple of other reasons why you probably would not want the 25 inch shaft and there are probably more reasons then I can think of.

1. Will the motor tilt completely out of the water when underway without dragging? Some boat/motor combinations will not. Might create a big rooster tail for show though.

2. The extra 5 inch length gives more hanging out the back when even tilted up which can bounce much more on the transom possibly creating problems like cracking, breaking, the transom etc. when underway or when trailering if in the up position.

3. You are already talking about a 4 stroke which is heavier then a 2 stroke, plus now you are adding another 5 inches of shaft. How much more weight is that?
You don't mention what size and weight the main motor is.

The list could go on.

Good Luck and let us know how it works for you.

Joe Kriz -
1977 Montauk 17'
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