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



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Unread 05-19-2017, 12:23 PM   #1
Not Yet Wild
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Default yamaha being jerking and being sporadic

ok guys I have a g29 Yamaha 07. The cart has a newer controller and batteries installed about 1 year ago. the problem I'm having is the cart will run sometimes but not all the time. when it does run, it jerks and runs sporadic. I thought for sure it was the throttle position sensor, but it wasn't. Then changed out the motor speed sensor and that didn't work either. Any ideas? I usually don't mess with Yamaha and don't have any manuals on them.
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Unread 05-19-2017, 01:11 PM   #2
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Default Re: yamaha being jerking and being sporadic

I also noticed when it doesn't run, if I jack it up and spin the rear wheels at will start to run and kick on and off.
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Unread 05-19-2017, 02:43 PM   #3
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Default Re: yamaha being jerking and being sporadic

Motor. Pull it & check the brushes & commutator.
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Unread 04-21-2018, 01:01 PM   #4
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Default Re: yamaha being jerking and being sporadic

i know this is an old post but it did end up being the brushes in the motor. thank you
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Unread 06-06-2018, 06:19 PM   #5
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Default Re: yamaha being jerking and being sporadic

1 of our consignment customers has brought me her 2009 Yamaha cart. its doing something similar. sometimes runs fine, but I may walk out there right now put it in rev and it just jerk. like going in and out of gear. next time be fine. same goes for fwd. was hoping maybe something simple like the switch or a connection issue. I will try and pull the motor this weekend and check it. if it is the brushes are they replaceable or is it time for a new motor. this 1 looks to be a replacement.
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Unread 06-15-2018, 08:34 PM   #6
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Default Re: yamaha being jerking and being sporadic

Iím wondering the same thing. My 2012 Drive started jerking when accelerating from a stand still, as well putting out a grind or stutter when rolling slowly to a stop. This behavior began two weeks ago. Today, I drove it down the street, and power/speed seemed to be down about 75%. Then, after about a quarter mile it began jerking, stuttering and eventually stopped moving altogether. All the while, the digital battery gauge was jumping all over the place. Any thoughts?
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