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mx317 mx317
5/12/2020 6:26 AM

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?

Take it to the limit, one more time!

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Elsie88 Elsie88
5/21/2020 10:28 AM

Post up a few pics if you can. I have a few extra cylinders and will gladly compare them for you.

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mx317 mx317
5/21/2020 11:44 AM

Thanks! I compared it to my other ones and determined it was the optional cylinder. The exhaust is wider with less space between it and the transfers and the intake is cleaned up a bit. I'll still post a picture when I get home. Tom Morgan just ported one for me and I hope it runs as good as it looks!

Take it to the limit, one more time!

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project racer project racer
5/21/2020 5:12 PM

The 250 would have been great if they only would have made that cylinder standard, instead of optional.

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