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Old 06-24-2013, 06:25 AM   #1
lappa
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Default Yamaha G2 Exploded clutch/Sheave

New to the forum. I was at my Brother-in-laws nursery and he asked me to have a look at his buggy. Its a Yamaha approx. 1986-87 so I assume is a G2.
The clutch diagrams I've looked at seem similar through-out the G range.
Two of the weights have worn through and ripped through the steel dust shield.
My questions are as follows:
Is the main clutch centre bolt RH thread?
Are the pins on the centre spider just a press fit? I can see the ones on the main assembly are held in with Allen keys.
Are there w'shop manual readily available - I've searched and haven't come across any.

Thanks in advance for any info.

Lappa
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Old 06-24-2013, 09:36 PM   #2
Mike Mac
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Default Re: Yamaha G2 Exploded clutch/Sheave

Lap, yes on the RH thread,and heat the allen screws with a propane torch to free up the lock tight that holds them tight. Can't remember on your other questions. Sorry!!
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Old 06-24-2013, 09:38 PM   #3
sho305
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Default Re: Yamaha G2 Exploded clutch/Sheave

The weights are not cheap, they are the weight and link in one piece. That pin is pressed and peened in and usually the one that lets go. The G2/G9 used this clutch then yamaha moved to the roller style on newer carts. The pin in the spider and movable sheave come out with set screws (allen). They are supposed to be loctited so you heat them a little to remove. Don't tighten them very much or they don't want to ever come out. There should be a manual you can download here someplace, I've seen it. Check the moving sheave for thickness they can wear through, and for the cost you might as well get a new aftermarket clutch. Otherwise new or good used weights should fix it. The bolt is standard fine thread iirc. You don't need to remove the fixed sheave, take the bolt out and it all will fall off. They put a plastic type of bushing in the pins and once it wears through they go bad fairly soon. I guess they do last a long time, but somewhat of a pain to fix. Not hard just takes a while. I bought some used ones for mine the sheave is thin so plan to get a new clutch next.
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Old 06-25-2013, 04:25 AM   #4
lappa
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Default Re: Yamaha G2 Exploded clutch/Sheave

Thanks to all that replied. Further investigation ID'd it as a G9A. Weight and pin repair kit $163, Bush $14, Cover $80 or complete Unit $641. That in Australia.

Parts ordered.
Thanks again

Lappa
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Old 06-25-2013, 07:45 AM   #5
Mike Mac
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Default Re: Yamaha G2 Exploded clutch/Sheave

Hope you called "Cartpartsplus", thats sounds a bit expensive!
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Old 06-25-2013, 07:31 PM   #6
sho305
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Default Re: Yamaha G2 Exploded clutch/Sheave

They are all over ebay also. What was it here like $80 US for the three weights? I bought used got two good ones and one of mine were still good. Here a clutch is around 300 for aftermarket.
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Old 06-26-2013, 07:59 AM   #7
kev2504
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Default Re: Yamaha G2 Exploded clutch/Sheave

Speaking of clutches, is the Comet much better than the Yamaha?
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Old 06-26-2013, 08:56 PM   #8
sho305
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Default Re: Yamaha G2 Exploded clutch/Sheave

Depends on what you do with the cart. In general the aftermarket clutches are better if you offroad and stuff or have a lifted cart. If you golf (or are really mellow, just campground ride, etc) and want a smooth quiet running/takeoff cart then the stock clutch is nicer for that. The aftermarket clutches you can adjust, can make them takeoff much harder or shift at different rpm so they are very ideal if you change the engine or modify one as you can tune them to the engine. They are not quite as smooth as stock clutches, but can be made to work pretty close to that if you want. Otherwise they are not that much different, they serve the same purpose.
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Old 06-27-2013, 09:23 AM   #9
kev2504
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Default Re: Yamaha G2 Exploded clutch/Sheave

That is what I thought. Think I will rebuild the stock one, in the near future. Got to do a little hear and there, to get it by the wife.

Thanks
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Old 06-27-2013, 05:46 PM   #10
sho305
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Default Re: Yamaha G2 Exploded clutch/Sheave

That is fine the problem is with my G9 the alum sheave wears from the belt and when it gets dished in it does not shift right. Eventually it wears through and gets holes in it and trashes your belt. That sheave is like 200 plus the weights, that is what a new clutch costs.
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