I believe the high speed screws weren't adjusted properly, that would make sense as to killing them on the lake which is allows you to run WOT quite a lot. That trip to Alton Bay is 18 miles and we were moving pretty good the whole way. The spark plug that came out of the dead cylinder was dry and looked like it may have been running lean. We rarely get to run WOT on the trails so that would explain why you don't see a problem on the trails like you would on the lake. The only way to really test this is to do short runs WOT and then inspect the plugs to make sure they look good and the mixtures is good.
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