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 Shimming a BW 40 
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MMT Pro Member

Joined: Thu Jan 28, 2016 8:35 pm
Posts: 67
Post Shimming a BW 40
Been having fun with the new 40. Season started and it has been great.
I did notice the other day that if I push down on the handle to move the cavatation plate upward, I immediately pick up rpms and about 2 mph.

So, I figured a shim might help.
I installed one and it helped some, but when I pushed down on the handle, again I picked up rpms and speed.
So I thought I would add 2 shims.
Before I did, I look at the cavatation plate, it extends beyond the the prop about an inch, maybe a little longer.
When I added a 2nd shim, the plate moved upward on the drive tube and the the prop was even with the edge of the plate and maybe a little beyond.

Would this be an issue? Has any one added 2 shims? How did the 40 perform?

On a side note, what rmps are you getting with a loaded boat. I'm running 3900 to 4100. Wondered what others are getting.


Tue Nov 20, 2018 7:34 pm
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MMT Member

Joined: Wed Apr 27, 2016 7:17 am
Posts: 24
Post Re: Shimming a BW 40
I get between 4100 and 4300rpm loaded


Wed Nov 21, 2018 4:34 am
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MMT Pro Member

Joined: Thu Jan 28, 2016 8:35 pm
Posts: 67
Post Re: Shimming a BW 40
I think I have it dialed in.

Runs right at the surface.

4250 RPMs.

1st time I have ever been able to run a longtail sitting down..


Fri Nov 23, 2018 5:27 pm
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