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Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles



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Old 12-21-2022, 04:59 PM   #1
y g cart
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Default G1 no baffle in cylinder exhaust control

Decided to cook the muffler as some have suggested while I have it off to rebuild my S G . Looked into the exhaust port and see just a rod with 2 holes in it. looks like a butterfly of some sort should be there. Can I run this with out it? thanks in advance
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Old 12-21-2022, 07:42 PM   #2
Leon willis
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Default Re: G1 no baffle in cylinder exhaust control

Looking throw the exhaust port you can see two holes in the piston that means the piston is in backwards
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Old 12-22-2022, 09:04 AM   #3
y g cart
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Default Re: G1 no baffle in cylinder exhaust control

What I am seeing is a rod in the exhaust port with linkage attached that moves with the throttle. Seems there should be a plate attached to it.
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Old 12-22-2022, 03:39 PM   #4
Leon willis
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Default Re: G1 no baffle in cylinder exhaust control

If Yamaha put there I would keep it there wait go on YouTube and find maybe the you will have step by step
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Old 12-22-2022, 06:52 PM   #5
mikeasis
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Default Re: G1 no baffle in cylinder exhaust control

Quote:
Originally Posted by y g cart View Post
What I am seeing is a rod in the exhaust port with linkage attached that moves with the throttle. Seems there should be a plate attached to it.
This was were the butterfly valve was.I take it the oil injection has been deleted.
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Old 12-24-2022, 09:26 AM   #6
slonomo
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Default Re: G1 no baffle in cylinder exhaust control

That's some kind of exhaust back pressure butterfly that Yamaha engineered, not totally sure of the actual purpose. Every G1 I've ever owned I removed them, most I've worked on they have been removed. They were hooked to a ball and socket linkage that ran to the carb throttle linkage. If the butterfly portion is removed, the vertical shaft should stay installed because it plugs the holes. Hopefully the linkage is also removed? Should not affect performance at all.
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Old 12-25-2022, 11:49 AM   #7
y g cart
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Default Re: G1 no baffle in cylinder exhaust control

Thanks, thats what I was hoping to hear. Still have to delete the oil injection.
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Old 03-23-2023, 05:21 AM   #8
AUTOMAN
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Default Re: G1 no baffle in cylinder exhaust control

Idle stability control.

cliff
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Old 08-15-2023, 09:16 AM   #9
Reeves Racing
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Default Re: G1 no baffle in cylinder exhaust control

You can replace your exhaust manifold with one from a snowmobile. They didn't have the butterfly or shaft and are a direct replacement.
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