Well,for one thing you posted in the wrong category.Post in engine conversions or a moderator will move shortly.Any way a pic would be nice and do you have any ccs of the motor.If not,measure the bore in mms through the exhaust port with a popsicle stick.Then measure the stroke the same way and post it and i can tell you the ccs.But a pic of it would be better with no shrouds on it if possible.It might also have needle bearings on the crank.