Hi all im new here so please bear with me, I purchased a Yamaha engine it is a 2 stroke 2 cylinder but having problems with the hp, it has a yamaha 25hp engine cover on but we ordered a 25hp power head and its alot smaller than out engine so we are unsure, we were told its mid 80's there is no plate anywhere on the engine with the engine code etc on so we cannot get a piston for it. Im hoping someone may be able to help with other ways to check, i measured the bore and its 72mm i have uploaded loads of pictures to try help. hope i make seance
