Whats the difference in the thick and thin again? My 4000 is thin, my 3800 is thick but is still a 61cc like the 3700. I think all my 3400’s are thick.Need to check your topend rings to see if you really have the 3700 thin ring one. Some of those were thick ring 3800.
Have both and about 50/50 chance here it seems.
Sold a super nice one to a collector.
Whats the difference in the thick and thin again? My 4000 is thin, my 3800 is thick but is still a 61cc like the 3700. I think all my 3400’s are thick.
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