Here’s some notes from others, I had saved in my files———
—————–
I would like to know where to get impellers also for a 7.5hp bailamatic.
I have used a honda impeller part number 19210-ZW9-013 I had to shim the
housing with 1/16 inch stainless and also shim the impeller to the shaft.
I am getting ready to fix a Firestone that was made by Scott I believe and
it would be nice to purchase the impellers if someone knows where to get them?
I only shimmed the top impeller using a honda impeller on the engine I re-did
since the lower one runs the bailamatic I didn’t re-do it. You can see it
run here. I did send an email to flying scott but didn’t get a response.
Thanks for the help.

Joe
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Re: Scott 10 hp where is water pump
Postby Mumbles » Tue Jul 05, 2016 9:34 pm

cannuck wrote:
Is it necessary to replace both .

Not unless you want to use the bailer option.
I think some guys have tried it by removing the one
impeller but for this ’56 7.5, I made up an aluminum
hockey puck to fill the bailer impeller cavity and plugged
all of the unnecessary holes. Now it runs cool and pumps
like a fire truck.
=================
I ran across this inexpensive, readily available Honda impeller
that is supposed to fit the Scott Atwater Bail-A-Matic 7.5hp.
Just passing along the info. Curious to find out if it works:

Honda 4-stroke 8hp 9.9hp BF8D BF9.9D
19210-ZW9-013
Number of Blades: 6
Plastic Hub
Height: 14.77mm
External Impeller Overall Diameter: 45.04mm
Internal Shaft Insert Diameter: 13.35mm
==============
Ron Hawkins used Honda 19210-zw0003 impeller
Ron Hawkins I just removed the original liner
and the modified the inlet and outlet holes on
the 9.9 Honda liner and epoxied it into the S/A housing.
===============
Ron Prochaska
Author
Tony C Zamp only problem I’ve had so far on the 5th dry
start the factory drive pin is too small. It slipped.
I used a 6/32 stainless bolt and enlarged the slot on the
impeller. Had 3 more dry starts no issues I’m torturing
this to see how well it will handle the housing being up
so high. So far this is better than old nos impellers I’ve
tried in the past. I have not wet them before starting once.
I’m sure if you wet before starting you will have no problems
ever. As if now I’m ready to put it on my boat
=================
Jason Pickerell
I don’t understand how that impeller works by itself, but it
seems to, and many people have said that they did the swap.
When I mocked it up in the housing on my engine, the height
was great, but when I lined up the center bore of the impeller
with the center of the hole through the housing, the blade tips
didn’t quite touch the vacuum side of the housing. Maybe it’s
working good enough as a slosh pump on that side IDK.
I wound up epoxying the liner from the Honda inside the Scott
Atwater housing and die grinding holes in it. Once assembled,
and run, the tell tale stream was like a water jet!
=========
Ron Prochaska been there done that honda thing.. Works great
if you can add .064 to the ID of the housing and polish the
bottom..you remove the incert then turn a aluminum ring to
id .064 od to fit the housing… Bingo the small honda will do
it but it took me one whole winter to convert the damn thing
way back when
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• This reply was modified 2 years, 3 months ago by Buccaneer.

One of the e-bay sellers is Discount Marine Parts.  I have never purchased anything from them, but they are pretty well known.  Let us know what you find out, if you do.