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Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
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04-28-2014, 05:00 PM | #1 |
Not Yet Wild
Join Date: Apr 2014
Posts: 2
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G9 not starting compression??
Totally new to carts, was asked by a friend to work on his G9 gas cart. I have worked on every ATV under the moon and rebuild them from crank up all the time. So bear with me and give me hell as we go along here.
I turn the key hit the pedal, the electric motor turns the drive clutch like a "pull" start normally would turn over an engine. This is all it does. It does not fire the engine. IT has spark, but it appears weak. I have known to hold throttle open to check compression, with a tester in the hole IT reads 50psi, clearly very low and would not start just due to this. I just want to confirm there is no other trick to reading a cart compression as that electric motor is the only way to turn the cart over. Is there a link or site anyone can recommend to guide me through a top end build. I believe cart engines/cylinder is all one piece and not like an atv engine? So would this be a big job? |
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04-28-2014, 06:26 PM | #2 |
Sometime's............
Join Date: Oct 2007
Location: Tacoma Washington
Posts: 11,874
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Re: G9 not starting compression??
Exactly how you check compression, at "wide open throttle". First, thake the valve cover off and see if a push rod came loose of a rocker arm. You should have 155 to 175 psi compression on that engine.
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04-29-2014, 06:57 PM | #3 |
Not Yet Wild
Join Date: Apr 2014
Posts: 2
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Re: G9 not starting compression??
I'll take a peek in the valve cover in a day or so if I can get to it after work. As far as the unit being one piece, are these able to be bored out?
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04-29-2014, 07:05 PM | #4 |
Sometime's............
Join Date: Oct 2007
Location: Tacoma Washington
Posts: 11,874
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Re: G9 not starting compression??
Shure, they have .25 and .50 over piston and rings available.
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