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Old 11-09-2012, 03:01 AM   #15
B-Rod's Avatar
Joined: Jul 2007
Location: Alberta
Oddometer: 1,980
An FCR on a 640 would be fun fun fun. Maybe fire off a message or call Motolab. He might have some jetting suggestions, or even JDjetting. To me a 162 main at sea level sounds lean for the air a 625cc pumps through
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