I purchased a 21 foot center console with a Yamaha 150 4 stroke. I think it is model 150TXR but not certain on the code yet. The price was right even without a motor. The previous owner passed and the setup was being sold by a relative. He claimed that the motor would run but that there was a balancer made of a plastic material that has disintegrated. He offered to start the motor saying that it would harm the motor if it was run as plastic from this balancer may be throughout the oil passages ect. I only wanted the boat and the price was right so I purchased it. I am almost motor savy but know nothing about these larger 4 strokes. Can anybody verify a part or where to look at a diagram which may show this plastic balancer thing. It seems that new powerhead or rebuild might be worth while or I may just part it out. I appreciate your replies. Thank you in advance.