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This is probably addressed to the European guys, have you tried this engine before? I know they are picco based casings but Collari Modified. Are yhey any good?

M7H

Yep....

Well, I hear different stories about them, but in general you don't see them in the championship races.....
But as the XS510 is a new engine which does look nice,
things might change.....

1 important thing, the price is nice, so.......