1977 B75 4 stroke

[JitteryMoose]

So I'm looking for some direction. I just acquired an old Honda B75 outboard. It's in excellent condition. I need to replace the impeller and couldn't find parts for this model. I decided to try the one from the next generation of this model the BF75 which is readily available. If it works I'll report here to begin compiling a list of substitute parts for this outboard.

I have a couple of questions to throw out.

1. Does anybody know of a thread like this already started for B75's?

2. Does anyone have any experience to add to this topic? I came across a similar question posted elsewhere where someone found that the carburetor from the BF75 doesn't work on the B76 because it's mount is vertical instead of horizontal.

My hope is that there is a way to keep this model from becoming obsolete. Thanks in advance for any help!

P.S. I'm already wondering about possible substitutes/ mods for thermostat and ignition coil.

 

[jgmo]

First off let me give you my disclaimer and caveat:I DO NOT KNOW IF THIS WILL WORK NOR HAVE I EVER TRIED IT.

Having said that, compare the intake manifold for the B75 (item 5 in diagram from the link below) and the manifold to cylinder head gasket punch-outs (item 2)

http://www.boats.net/parts/search/Honda/Outboard Engine/0/B75K2 LD/INLET MANIFOLD/parts.html

Compare with the same items depicted for the BF75 in the link below.

http://www.boats.net/parts/search/H...F75D SA/INLET MANIFOLD C.D.I. UNIT/parts.html

The bolt pattern and gasket punch-outs look the same to me.

What I'm saying is that, for the later carburetor to work, you would need to mount it on the later, horizontal flow, inlet manifold. If the manifold matched the early block then it COULD be as simple as getting the correct length bolts and reconfiguring the throttle linkage to retrofit the later carb.

It's just an idea and it would cost you an extra $71.10 + tax & shipping to find out.

Good luck.

P.S. boats.net has a return policy. I am interested enough as to whether or not this is a viable option, I will pay for your return shipping charges if you decide to try and it doesn't work out.