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Old 09-16-2022, 09:13 PM   #1
Chris_feldk
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Default Yamaha G1 Speed Low Top Speed

I had recently got my g1 running and it seems to run pretty good. I am wondering if there are any ways to speed it up, i have put a longer screw in the governor spring and jetted the carb. I have a tachometer installed and it revs near 6000 rpm and gets only about 14 Mph i believe i have 18 inch tires as well just really wondering if there is a way i can speed it up. Any ideas will be greatly appreciated, Thank you!
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Old 09-16-2022, 09:28 PM   #2
CP241
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Default Re: Yamaha G1 Speed Low Top Speed

Check your clutch operation. Worn clutches can degrade performance in major ways. After all, they are what transfers engine power to motive force.
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Old 09-17-2022, 01:36 PM   #3
DOOmsman
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Default Re: Yamaha G1 Speed Low Top Speed

Cp is right, also check that belt is not to long(stretched) or worn (to narrow).
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Old 09-17-2022, 01:45 PM   #4
Chris_feldk
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Default Re: Yamaha G1 Speed Low Top Speed

It also seems that the clutch and belt get extremely hot and is even uncomfortable to just touch the belt. I might end up changing it. I'll let you guys know!
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Old 09-17-2022, 08:41 PM   #5
slonomo
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Default Re: Yamaha G1 Speed Low Top Speed

If you have heat on the belt, that means it's slipping. Could be a belt issue or clutch issues. Make sure you get a "OE" quality belt, I've never had good luck with cheap ebay or amazon belts.
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Old 09-18-2022, 06:22 PM   #6
Chris_feldk
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Default Re: Yamaha G1 Speed Low Top Speed

Quote:
Originally Posted by slonomo View Post
If you have heat on the belt, that means it's slipping. Could be a belt issue or clutch issues. Make sure you get a "OE" quality belt, I've never had good luck with cheap ebay or amazon belts.
I believe I have the original belt that came with it or might have only replaced once i will buy a OE one and install it.
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Old 09-20-2022, 09:41 AM   #7
Curt-IA
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Default Re: Yamaha G1 Speed Low Top Speed

The OEM Yamaha belt is only a few dollars more than the cheapo amazon/ebay ones. I would definitely get the OEM, like they said the belt makes or breaks the overall performance of the clutches. If it is too long or narrow it's like trying to start in 3rd gear in a 5 speed vehicle, and you never reach top speed either, really hampers performance.

You can make sharpie marks on the primary clutch sheaves and see how much of it rubs off after a top speed run. That shows you how far the belt is travelling up the sheave.
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Old 09-17-2022, 08:45 PM   #8
CP241
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Default Re: Yamaha G1 Speed Low Top Speed

https://www.youtube.com/watch?v=uCEvBGT8twM

This video explains clutching and how it should work so you know what to look for
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Old 10-03-2022, 12:10 AM   #9
griffo002
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Default Re: Yamaha G1 Speed Low Top Speed

I did that to my governor and it went like a bullet.....Jack it up and check the clutches are working properly.
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Old 10-03-2022, 12:31 PM   #10
Chris_feldk
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Default Re: Yamaha G1 Speed Low Top Speed

Quote:
Originally Posted by griffo002 View Post
I did that to my governor and it went like a bullet.....Jack it up and check the clutches are working properly.
i have before it looks fine. how fast do you think your motor reved? I keep mine casually at 5500 rpm and nothing has happened yet.
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