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



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Old 03-24-2021, 12:52 PM   #1
HarleyTim
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Default 1998 G16E very slow, no torque

Hello, I've got a 1998 G16E that is slow, maybe 10mph and has no torque. I (270 lbs solid) and my daughter get in it for a little ride and when we hit a slight incline. The cart slows to about 8mph or less. I was thinking its a battery thing, the newest battery is 2017, but the more I research in to this it may be inherent in the cart itself. I plan on putting new batteries in very soon, but I wanted to see if the more knowledgeable people here could steer me in a direction that may produce more speed or torque out of this cart.

From what I can tell, all the electronics are the OE parts. I've looked and I can't seem to find a 48v conversion kit for it, and both my closest Yamaha dealers are telling me that the speed controller for it can not be re-programed.

Am I SOL here?

Thanks
Tim
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Old 04-02-2021, 07:00 AM   #2
rstacy
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Default Re: 1998 G16E very slow, no torque

There are a few things to check. What is the overall battery pack voltage under load? An easy way to check this is to put the car up against a wall and apply a little pedal while monitoring the battery pack voltage to see if it is dropping off.

Battery cables could be corroded.

The forward/reverse switch can also melt/burn causing high resistance and poor performance.

The motor brushes could be worn.
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Old 04-02-2021, 07:47 AM   #3
Reddawg454
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Default Re: 1998 G16E very slow, no torque

Putting the cart up against a wall is a very bad idea. Stalling the motor can fry numerous components. Check the voltage while going up that hill at 8mph to avoid damaging the cart.
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Old 04-02-2021, 07:56 AM   #4
rstacy
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Default Re: 1998 G16E very slow, no torque

Quote:
Originally Posted by Reddawg454 View Post
Putting the cart up against a wall is a very bad idea. Stalling the motor can fry numerous components. Check the voltage while going up that hill at 8mph to avoid damaging the cart.
I disagree. Notice that I said a little pedal. All you want is a small draw. Do it just long enough for the reading which wont fry anything (Not in a Yamaha anyway).
This is safer than trying to take a reading in a moving car.
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Old 04-02-2021, 09:04 AM   #5
Volt_Ampere
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Default Re: 1998 G16E very slow, no torque

Bad idea. The commutator can be cooked easily by stalling this kind of motor under load. You can probably get away with it but I would not recommend it.
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