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Sorry for the delay in someone getting to your question. I would think the more likely problem is a rough valve seat. If you have quite a few miles on the engine, then this is pretty common, but it can happen on engines with just a few miles. The gas we have now with additive corn fuel is hard on valves and guides. Take this into a good shop and have them put it on the scope and check the compression. That should show you the cause for sure. Hope this proves helpful here. Please get back to me if you need more as all follow ups are included in our fee.
I will get back to you with that.............it may be a few hours before I hear.
When do you want me to call? Sometime this weekend would be good.
Glad to do it...........I will watch for your post.