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07-08-2020, 08:23 PM | #1 |
Not Yet Wild
Join Date: Apr 2020
Posts: 58
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2015 EFI JR7 Stuck Intake Valve
I am working with a 2015 G29 EFI cart. The intake valve keeps sticking. Once I got the head on the bench I had to tap the intake valve out of the head with a punch. It didn't take a lot of force though. Once I got the valve out and put some oil on it, it moved freely in the guide. I am stumped as to what is causing this. The cart will run for a day or so then the valve sticks again. The valve don't appear to be bent and the guide don't seem to be loose. If both valves were sticking I would think that sufficient oil supply is not reaching the rocker galley. It is always just the intake valve. Any ideas?
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07-08-2020, 11:37 PM | #2 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: 2015 EFI JR7 Stuck Intake Valve
Bad fuel and not cleaning the intake tract & valve guide thoroughly enough. I've been down this road several times.
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07-09-2020, 06:44 AM | #3 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,421
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Re: 2015 EFI JR7 Stuck Intake Valve
Carbon buildup and/or glazing can cause "stiction". Stiction is sticky friction, and it's a real problem. You can manually clean the surfaces of the valve and valve guide, then use "stiction eliminator" additive to the oil. That will dissolve the deposits and help the valves move freely. The additive also has a micro lubricant that will help.
https://www.hotshotsecret.com/stiction-eliminator/ https://www.youtube.com/watch?v=xPxz7dFawY8 |
07-19-2020, 10:00 PM | #4 |
Not Yet Wild
Join Date: Apr 2020
Posts: 58
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Re: 2015 EFI JR7 Stuck Intake Valve
I removed the head and cleaned it very good. Replaced the intake valve and lapped both valves. Flushed out the fuel system and serviced with fresh gas without ethanol. Time will tell if this is a fix. Will post updates.
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g29, jr7, stuck valve, valve, yamaha |
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