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Does the rear cylinder come in any with more rpm's?
Rev it to 2500 or so and pull the rear plug wire, see if it drops any rpm's.
Ding ding ding! And the winner is Schex. When I started trying to diagnose my problem one of the things I tried was trying to spray some startling fluid (ether) around the intake ports. Unfortunately I didn't have that little tube to direct the spray, so some of it always got sucked into the carb since the air cleaner was off. Once I found the burned cam position sensor I quit thinking about anything else until I had a new ignition and new coil, but still had my trouble. Yesterday I was rooting around in the garage and found some carb cleaner, complete with the spray tube. I sprayed some on the rear intake port and presto! Rpm increased. Pulled it down this morning and sure enough, bad intake seal. Good to go now, I think. Thanks for the suggestions everyone and in particular hillcountrycustoms who was generous enough to offer the loan of a coil.
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