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Originally Posted by Mamono
My question is two-fold. First, is the suggestion of carbon buildup a possibility? If so, would ATF break down the carbon like the other guy said? If ATF is not the way to go, what would work?
Thanks
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Welcome to the forum.
It's possible that carbon built up on the seating face of the valve........because it was stuck open.......and now it won't seat properly.
ATF won't do a thing to fix this problem.
You need to pull the head and have the valves done. Typically, the guides and seals are replaced at the same time. I had the prechambers replaced at the same time.
It's important that the head go to a very well qualified shop.
I sent mine to Metric Motors in CA. Anybody local was just playing with themselves.
Your local mechanic can R & R the head for about $800. or so. The cost at Metric will be between $400. and $1100. depending on how much needs to be done.