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Ya I think I jacked up my hull too high, the hull boom same level with bottom hull of my tunnel, i will try lower it down a bit.
What you mean is I need to bored more wide on linear wall than Wiseco...

Hi sir,

What portion size need to cut (lenght & wide) for Yamaha 50hp 3cylinder at cylinder wall or linear?
Thanks

Yes sir, i run extra piston (Wiseco 3130P4) and bore clearance is 2.678in, and my problem is my engine always overheat after run for 300-500mtrs, and i burned 6 Wiseco piston in 1 year time. Until...

Hi Fast Red,

What is the perfect dimension cut/sized (wide and long) of port suitable for Yamaha 50hp 3 strokes model 6h4?
Another question is why my engine always overheat during the race and...

Hi Fast Fred,

What is the different between build up port on the piston compare the original one. Thanks