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Old 01-24-2018, 11:01 AM
zogthegreat zogthegreat is offline
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Default custom mounting flange for Keihin (or Mikuni)

Hi everyone!

So I'm waiting for parts to come in the mail and I got a little bored. I also had a carburetor sitting in it's box. It's a reproduction of a Keihin that I got for $23.00 on eBay. So I decided to make a mount for it.

I started by making a template of the intake both on the Honda clone that I'm using and the carb:



I glued these to a piece of 1/4" steel and I used a 1 1/8" bi-metal hole saw to cut the intake holes, (I should have gone out and bought a 1" hole saw, but I felt lazy!). I then cut a 3" piece of 1" steel pipe to act as a manifold:



So that the pipe didn't bottom out on the flange, I put a washer in the center of the flange as a spacer:



I welded the head/Honda side first, then I mounted it onto the head. I bolted the carburetor to the second flange and set that onto the manifold, positioned it properly and then tack welded the flange in place.



Then I took everything apart and welded the second flange into place:



To prevent rust, I sprayed the outside with high temp engine enamel. I will figure out some thing for the inside of the manifold later, , (not really sure what yet, maybe some enamel paint).



Once everything was finished, I mounted the carb:





Then I started up the motor and did the basic tuning of the carb:

https://youtu.be/QKYhrluExW0

If anyone wants to copy this, here are the patterns for the flanges:

http://ohsmeg.com/bill/projects/moto...e/template.pdf

(EDIT) here is the link for the carburetor:

https://www.ebay.com/itm/PZ22-22mm-C...72.m2749.l2649
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Old 01-24-2018, 11:06 AM
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I've done that using big washers instead of drilling the big holes. It beats trying to buy one and DIY is always more satisfying. Good job!
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Old 01-24-2018, 11:08 AM
mckutzy mckutzy is offline
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That's pretty cool looking...
Basically how I made my in take adapters...

I also filed the flanges flat, as I had a bit of a warp fitting to the face of the block.
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Old 01-24-2018, 11:15 AM
zogthegreat zogthegreat is offline
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Quote:
Originally Posted by qtband View Post
I've done that using big washers instead of drilling the big holes. It beats trying to buy one and DIY is always more satisfying. Good job!
Thanks. Yeah, the thought of spending $40.00 for an adapter when I can make one basically for free makes my teeth grind! It's not that I'm cheap, but if you can DIY then why not?

Quote:
Originally Posted by mckutzy View Post
That's pretty cool looking...
Basically how I made my in take adapters...

I also filed the flanges flat, as I had a bit of a warp fitting to the face of the block.
I used a angle grinder, first with a grinding disk and then a flap disk to smooth it out.

What did you guys do for the inside to prevent rust?
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Old 01-24-2018, 01:09 PM
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Nothing for me... Just kept an eye on it... Cleaned it out when I saw it...
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Old 01-24-2018, 01:38 PM
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I just bought the gopowersports one for 20$
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Old 01-24-2018, 02:52 PM
zogthegreat zogthegreat is offline
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Quote:
Originally Posted by gman3850 View Post
I just bought the gopowersports one for 20$
Thanks for the heads up on that. The only ones that I could find were $40.00 + shipping.

---------- Post added at 04:52 PM ---------- Previous post was at 04:44 PM ----------

BTW, does anyone have any suggestions on how to hook up the return line to the fuel tank? I'm not sure what the law is up in Quebec, (or down here in Florida for that matter), and I want to cover my derrière.

I was thinking just a brass hose fitting mounted to the top of the tank, but if anyone knows something that can be flush mounted, that would be better.
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Old 01-24-2018, 04:02 PM
mckutzy mckutzy is offline
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I don't see a pump, So you wouldn't need a return line...
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Old 01-24-2018, 05:36 PM
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Quote:
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I don't see a pump, So you wouldn't need a return line...
So I can block off that nipple then?
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Old 01-24-2018, 07:53 PM
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Don't paint the inside of the intake. Gas will just remove the paint.
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Old 01-24-2018, 10:59 PM
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So I can block off that nipple then?
As Im not totally familiar with this carb, Im going to vaguely say yes cap it...
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