Super Jet Is this the marking for a 00 61x?

[vcolf]

Dusted off my sisters old RN limited build on a 97’ superjet. Is this the marking for the desired OEM port match? It is marked 00 on both sides. Does this mean it has a better port match?

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[kevbo]

No, those numbers have absolutely nothing to do with performance. Yamaha used a permanent mold casting with transfers set a 116 degrees open. They then installed cylinder sleeves with 120 degree windows in all 61x cylinders. 62T cylinders have the casting and sleeves both set a 120 degrees open along with a higher exhaust port.

 

[vcolf]

Thanks for the clarification. Have 2 cylinders and will be porting one, they are identical other than the marking. I guess there is no difference in which one I keep stock...


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