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Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
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09-19-2015, 09:28 AM | #1 |
Gone Wild
Join Date: Jun 2012
Location: Spicewood, TX
Posts: 219
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Conundrum - G1 Clutch
Lately I have been noticing that my clutch is engaging at very low RPM (700-800). The manual states that it should start to tighten the primary sheave at around 1,400 RPM.
After disassembling the clutch to check the specs, I measured the primary spring and it is right at the 83mm in length that the SECONDARY sheave spring should be. It is nowhere close to the 118 mmm that the manual says it should be. Spring and G1 Service Manual shown below. Is the manual right, or did the spring "free lengths" get transposed? The heavy duty secondary sheave spring will definitely NOT work on the Primary assembly. Ideas? Suggestions? Thanks in advance, Ogre |
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09-20-2015, 09:07 AM | #2 |
Gone Wild
Join Date: Jun 2012
Location: Spicewood, TX
Posts: 219
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Re: Conundrum - G1 Clutch
OK, I'll try the question a different way.
Have any of you G1 (original primary and secondary sheaves) owners recently done any work on your primary clutch? Or do any of you G1 owners have any spare parts, consisting of a primary clutch spring? What is the "free length" of the spring? The difference between 83mm and 119mm is almost an inch and a half. That would make a significant difference in the amount of RPM slinging the weights to get the primary moving sheave to close. Not to mention the amount of force to press in and reinstall the circlip. Any ideas guys? Ogre |
09-20-2015, 11:49 AM | #3 |
Gone Wild
Join Date: Sep 2012
Location: Missouri
Posts: 2,755
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Re: Conundrum - G1 Clutch
Sorry, I can't be of any help. I'm of the "It works or it doesn't!" league. I don't know squat about clutches.
Just thought I'd let you know we are reading your post. |
09-20-2015, 01:33 PM | #4 |
Gone Wild
Join Date: Jun 2012
Location: Spicewood, TX
Posts: 219
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Re: Conundrum - G1 Clutch
Thanks, Steve. I thought, after 20 looks and no reply, I had muddied the water a little too much with the manual, spring length, etc. All I was wondering was did the PO(s) change the spring, or is it the right one.
Always good to hear from someone, even if it is . Since the manual seems to be waaay off, I hope somebody can help me with the correct "free length" of the spring. I was considering some way to add "spacer(s)" to compress the spring, but that will also change the spring rate, and the compressed length, which could affect the top end speed. Not sure which way to go until I can determine the correct spring size. Ogre |
09-20-2015, 02:02 PM | #5 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,421
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Re: Conundrum - G1 Clutch
So did you disassemble the primary clutch and measure the spring? If so, then the spring needs replaced. Good luck finding one, they are no longer in production. Most people will stretch them out and that usually takes care of it for a while, and this is what I did, seemed to work fine. I don't have the G1 parts any more, so I can't measure it to see how it compares. You could place a call to Don Plowman, he's the Yamaha expert. He'll have an answer for you. He can rebuild your clutches for you also.
Have you checked the secondary clutch spring? Maybe the previous owner swapped them unintentionally? |
09-20-2015, 02:37 PM | #6 | |
Gone Wild
Join Date: Jun 2012
Location: Spicewood, TX
Posts: 219
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Re: Conundrum - G1 Clutch
Quote:
First question ... yep, reassembled it with a spacer about 3mm in length, and clutch engages smoother. Lot's of spring manufacturers on-line who can build an order by specs. A little pricey, so maybe go with my original idea ... use spacer(s) to compress it a little more, to see what I get. I'll call Don tomorrow. If he rebuilds G1 clutches, maybe he has a source for correct springs. From all of the write-ups I've seen on here, I'm sure Don will have ALL of my answers, and most likely a solution. Just thought I'd check out the G1ers here first. Thanks Slo, Ogre |
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09-20-2015, 06:50 PM | #7 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,433
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Re: Conundrum - G1 Clutch
The length of the spring will dictate the engagement rpm, the strength will change shift rpm and depending it can change the rate of shift making rpm climb or drop as it shifts.
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