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Unread 10-17-2017, 02:08 PM   #1
Gone Wild
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Default 24mm bored 3-circuit carb for the gx390 & 420/440/460 clones

Hey guys,

We got our hands on some 24mm carburetors. They look like a traditional 21mm carburetor but better.

Choke lever that doesn't fall off and 3rd circuit so you can play with jets in the mid range of RPM's

http://www.vegascarts.com/24mm-Bored...4boredcarb.htm

Thoughts?

-Aaron
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Unread 10-17-2017, 02:57 PM   #2
HBR
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Default Re: 24mm bored 3-circuit carb for the gx390 & 420/440/460 clones

Does that 3rd circuit adjust with a screw or do you change jets?
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Unread 10-17-2017, 03:03 PM   #3
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Default Re: 24mm bored 3-circuit carb for the gx390 & 420/440/460 clones

Quote:
Originally Posted by HBR View Post
Does that 3rd circuit adjust with a screw or do you change jets?

The carbs are not adjustable, unfortunately.
Drilling or Changing the jets out are the (2) options.
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Unread 10-17-2017, 06:48 PM   #4
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Default Re: 24mm bored 3-circuit carb for the gx390 & 420/440/460 clones

I ordered one. Let the experiments begin.
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Unread 10-18-2017, 07:26 PM   #5
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Default Re: 24mm bored 3-circuit carb for the gx390 & 420/440/460 clones

I just ordered one too. I was going to bore out one of my spare carbs to 1" but this is close enough for a start.
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Unread 10-18-2017, 07:36 PM   #6
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Default Re: 24mm bored 3-circuit carb for the gx390 & 420/440/460 clones

Sort of the same idea I was thinking. I was going to buy another carb to work with but this gives me a head start and I can A-B test easily against my present set up.
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Unread 10-19-2017, 07:51 PM   #7
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Default Re: 24mm bored 3-circuit carb for the gx390 & 420/440/460 clones

Dug up the extra adjustable main jet kit I bought on Ebay for $10 a while back. Going to try it out on the new carb when it shows up here. Stay tuned.
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Unread 10-19-2017, 08:09 PM   #8
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Default Re: 24mm bored 3-circuit carb for the gx390 & 420/440/460 clones

I'm going to rob the parts from the carb I'm running now. By the looks of the choke side the velocity stack air filter adapter will need to be opened up some. Yes the time for experimenting has begun.
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Unread 10-19-2017, 08:31 PM   #9
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Default Re: 24mm bored 3-circuit carb for the gx390 & 420/440/460 clones

And I was the guy that was going just run the rest of the year with no more mods ? HMMM P.S. Have you done any timing experiments yet ?
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Unread 10-19-2017, 09:25 PM   #10
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Default Re: 24mm bored 3-circuit carb for the gx390 & 420/440/460 clones

I just renewed the plate today for another year. I'll be doing some road testing this weekend God willing. I'll do another video of it running down the road.
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