2strok4fun
Member
- Apr 6, 2002
- 1,085
- 1
I have my watercraft cylinder out now for some freshening up and other goodies. This is a steel sleeved motor with a displacement of 476.62cc x 2. While looking at the stock port layout and the entry angles, I notice the entry angle has a multiple angle, the sleeve and the casting have different target points. The front wall of the main xfer has a "kicker" with the sleeve pointing its target point directly to the rear of cyl/boost port. The front wall casting has a more typical target of approx 55% of bore. Also the back wall has a kicker trailing away to the rear of the cylinder as well. There are many people that are doing big bore on these motors going from the standard 88mm bore up to 92mm. This virtually removes the kicker. I think the possible downside to this is more short circuiting of charge. The charge short circuiting is my guess as why the cylinders may have the kicker for emission purposes.
I was thinking of changing the angle on the kicker without doing the big bore, by either grinding, which would increase the area, or by using epoxy. Shouldnt a target area more toward the center of the bore raise peak HP? What are your thoughts?
I was thinking of changing the angle on the kicker without doing the big bore, by either grinding, which would increase the area, or by using epoxy. Shouldnt a target area more toward the center of the bore raise peak HP? What are your thoughts?