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!

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.

Re: Yamaha G1 Speed Low Top Speed
 

Cp is right, also check that belt is not to long(stretched) or worn (to narrow).

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!

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.

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

Re: Yamaha G1 Speed Low Top Speed
 

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.

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.

Re: Yamaha G1 Speed Low Top Speed
 

Alright guys, I took a look at the old belt and it was worn down terribly. i bought a 40 dollar one off of golf cart king .com. And installed it, it accelerated quicker and had higher top speed with a lot of load on it but. it still only went 14 mph.
is it the clutch? or something else? thanks!

Re: Yamaha G1 Speed Low Top Speed
 

Most carts top speed with the governor is 12-15 mph. If it had a load on it I'd say 14 is pretty average. If you modified the governor you should get more top speed. Are you sure it's spinning at 6000 rpm? How do you know the rpm is correct? Could the setup on the tach be incorrect? Most tachs I've set up with a 2 stroke needed a special setting. With stock tires at 6000 rpm you should be over 20 for sure.

If the engine is truly spinning at 6000 rpm then you are getting some major slippage in the clutches or they aren't fully shifting.

Take a black sharpie marker and draw lines on the clutch sheaves from center to the outer edge. Take it for a ride as fast as it will go. Stop and look at the lines on the sheaves, see if they are worn all the way off or just worn partially. That will tell you how far your clutches are shifting out.