Sanding ?!?
Sanding valve stems scares me. I had the same problem as you , albeit one cylinder. With the head off I applied various lubricants to the valve stem , including carb cleaner , and gently rotated the valve. It took several tries , and a couple more head removals , but the offending valve has now been trouble free for 3 years.
Stick with it. (pardon the pun.) CK
Sanding valve stems scares me. I had the same problem as you , albeit one cylinder. With the head off I applied various lubricants to the valve stem , including carb cleaner , and gently rotated the valve. It took several tries , and a couple more head removals , but the offending valve has now been trouble free for 3 years.
Stick with it. (pardon the pun.) CK
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