how to adjust valves on a yamaha moto 4 80 - ATVConnection.com ATV Enthusiast Community



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Old 10-03-2015, 06:44 PM
Weekend Warrior
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Default how to adjust valves on a yamaha moto 4 80

just wanting to know where i can find instructions or a video on how to adjust the valves and the settings
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Old 10-06-2015, 03:00 AM
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I was hoping someone else would write in as I have only done this on later Yam 80s, and it was a long time ago. However I recon yours will be the same. Remove the screw in caps over the valves. Turn the engine onto top dead centre on the compression stroke, there is a recent posting in the Yam section about doing this on a Warrior. Check the inlet valve clearance, I'm not certain but I think it was 0.003", if it is out, slacken the locknut on this rocker arm, turn the adjuster, (anti-clockwise to increase clearance), tighten the locknut when the clearance is 0.003" and repeat for the exhaust valve. Re-fit the covers.
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Old 10-06-2015, 06:54 AM
Weekend Warrior
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Thank you, however I have found an online manual for the 4 wheeler. The steps you mentioned were correct. It purrs like a kitty. Starts on first try.
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