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Top end carnage, can anyone id this cylinder?


Rossp

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Just bought a new to me banshee and within thirty mins of run time I lost a cylinder. The previous owner bought the motor as is so he doesn’t have any idea how it’s built. Could you guys help me out identifying this cylinder? The crankcase was also half full of coolant on the side that I lost so I believe that is what caused all of this. 9d16571ef6ca2da8987d29d6031d8e24.jpgd4e3fa46bb39064be2368d7d0d86aa93.jpgb46091f66a74ab42f68b338eda0c6f5d.jpg129feaeaabecb10b3a8b0eccf3e5739b.jpgede79dfea6f46ad2d58d244cb58d0e8c.jpg

 

 

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That’s a cub, and you are going to need to tear that all the way down and inspect the lower end as well.

That’s the plan over the next few weeks. The bike overall is in pretty rough shape so I plan on taking this winter to get it cleaned up and everything rebuilt. Would you guys agree this failure could be head gasket related? There was some damage to the other cylinder too, just nowhere near as bad. This morning before it let go it had 115 psi of compression on both sides. I thought this was pretty low with 21cc domes.


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