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



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Old 12-18-2012, 02:33 PM   #11
rwt101
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Location: Pigeon Forge TN
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Default Re: Compression Issues

adjust the valves I think it is .0004 on both.
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Old 12-18-2012, 04:57 PM   #12
1BADYAMAHA
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Default Re: Compression Issues

Thanks NOBUCKBUILD, i have removed the valve cover and the valves appear to be opening and closing. I even removed the exhaust valve and use emory cloth and lapping compound to clean the valve and the seat. I need to get my hands on a feeler quage however to check the valve adjustment. I will do this tomorrow and adjust if needed. I beleive the clearance should be .004 but I will verify before adjustment. Thanks to everyone who has helped so far, I truly appreciate it!
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Old 01-05-2013, 04:28 PM   #13
rwt101
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Default Re: Compression Issues

Did you ever solve your problem?
Bob T
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Old 09-20-2013, 03:02 PM   #14
1BADYAMAHA
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Default Re: Compression Issues

No, same issue even after replacing rings, I am not sure however if I have the valves adjusted correctly, is there a manual or any literature to walk me through this?
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Old 09-20-2013, 06:17 PM   #15
sho305
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Location: West MI
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Default Re: Compression Issues

Turn engine to tdc, you will get compression and both valves stop moving. Adjust so you can just barely fit a .004 on tip of valve when adjuster is tight, if it has a lock nut as some don't. Rotate engine a couple times and check it again, that will fully seat the rockers/etc it may change and you have to set it again.
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Old 10-07-2013, 02:35 PM   #16
1BADYAMAHA
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Default Re: Compression Issues

ok, valves adjusted, terminals cleaned, replaced rings and honed cylinder. Still the same thing, even with a new battery and starter/generator it still has a hard time turning the motor past the compression stroke. This is getting ridiculousI am tempted to buy a rebuilt motor and just be done with it
!!! If any one has any suggestions please help
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Old 10-07-2013, 03:44 PM   #17
bigstik40
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Location: Erie, Pennsylvania
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Default Re: Compression Issues

Well, I read through all the posts and a couple other things to check that wasn't mentioned before, is to 1. make sure the V-belt between the starter and engine is not slipping. And 2. make sure the solenoid is able to pass high current without having excessive voltage drop. Also, I know you said the starter is new and all connections are clean and tight. So if that is true, and the solenoid is ok, then the battery health would be suspect. Try measuring the battery voltage before and during your attempt to crank the engine to see what the voltage is dropping to. If the voltage is dropping too far the battery may not be supplying sufficient current to crank the engine. Something must have been overlooked in previous tests/checks because this engine should crank !! Good luck, wish I could be more help, I know how frustrating this must be. - RAY.
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Old 10-07-2013, 07:47 PM   #18
slonomo
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Default Re: Compression Issues

What size battery do you have?
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