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



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Old 05-23-2010, 01:57 PM   #1
Stilettobob
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Join Date: May 2010
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Default Help! I've Lost Forward but have Reverse

I have a 1980(?) G1 Gas 2 stroke Yamaha. It is an unbelievable work horse that I use throughout the year dragging kids on sleds in the snow or hauling a small trailer with mulch for thwe wife's garden. Anyway, while mulching I lost FWD. When I turn the key and hit the gas....nothing! No starter noise. Just a light click from a relay. but when I put the key in REV it starts and backs up like crazy. If I start the key in rev and as soon as it catches, turn the key to fwd the G1 goes into fwd.

Anyone got the electrical diagram and/or diagnostis foer this machine?

Thanks in advance,

Bob in Charlestown RI
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Old 05-23-2010, 02:34 PM   #2
jreimers
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Default Re: Help! I've Lost Forward but have Reverse

hey bob, look at the sticky posts in red at the top of the yamaha page. there is one titled wiring diagrams. good luck, jim
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Old 05-24-2010, 05:16 AM   #3
GMB74
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Default Re: Help! I've Lost Forward but have Reverse

Sounds like a bad solenoid. You can swap them to check. If you gain forward and lose reverse, you have found your problem. I have heard of people taking the solenoids apart and cleaning the contacts to fix them.
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Old 05-25-2010, 12:24 AM   #4
kogieblack
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Default Re: Help! I've Lost Forward but have Reverse

Or bad key switch.
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Old 05-25-2010, 07:43 AM   #5
Todd Dolfi
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Default Re: Help! I've Lost Forward but have Reverse

I have 84 G1 gas and had/have same broblem. I switched my soleniod and put the next hotter plug in it fixed it for the most part but every now and then it still acts up for a min. or to. If you find out something else is the cause of this please post so I can fix mine 100%. Thanks and good luck...
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Old 05-25-2010, 09:12 AM   #6
berthasquare
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Default Re: Help! I've Lost Forward but have Reverse

Replace or repair the switch key relevant connection which I assume to be loose or broken..
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Old 05-25-2010, 06:36 PM   #7
smallblock450sl
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Default Re: Help! I've Lost Forward but have Reverse

On later model solenoids (they lay flat and have 2 large posts at front and rear) an easy test to check wireing up to the solenoids is...There are small black wires (slide on connectors) at the bottom/back of the solenoids, these are the grond wires and should have 12 volts to them all the time. Now there is a light blue (to one solenoid) and a yellow (to the other) these activate the solenoids with 12 volts positive from the key switch and stop switch at the pedal. You should have 12 volts to these wires with the key switch in either forward or reverse and pedal pushed. If you get good readings...solenoid/solenoid's or starter problem. Since you have reverse, I would think the forward solenoid or key switch is your problem.
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