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US
Trying to remember how to identify the GP cylinder from the standard cylinder on a 1973 CR250M. I just bought another Elsinore cylinder off eBay (it's a sickness) and it's a standard bore and it appears to be the GP 12100-357-810 optional cylinder. When I compare it to my other cylinders, the exhaust port eyebrows extend farther and reached the transfer port edge while the others do not. It also appears to have the intake cleaned up and matched, but no other ports are touched. Anyone?
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