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Old 01-02-2017, 03:41 PM   #1
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Cyber 370 Boat 25 yamaha Tuning! Help needed!!

Hi, I own . a Cyber 370 boat with a 25hp Yamaha enduro engine.. I would like to tune it a bit up as swapping to a 40hp engine makes the boat very dangerous, heavy and unstable. What are your opinions regarding upgrading the engine. Thought off tune the reeds distance and carb or porting.. Propeller I'm running 9.9 x 13 3 blade aluminium and doing 36mph at the moment.

Thanks Guys your help would be really appreciated
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Old 02-02-2017, 10:14 AM   #2
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Why don't you ask the guys at Chaudron? They should know.
Didn't they organize a racing series for that model?
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Old 06-02-2017, 10:53 AM   #3
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I would go with the Yamaha 30hp 3 cyl. 2stroke. Lots of potential -there's an APBA record at 80mph with a cat.
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Old 06-02-2017, 12:29 PM   #4
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Quote:
Originally Posted by PAS055 View Post
Hi, I own . a Cyber 370 boat with a 25hp Yamaha enduro engine.. I would like to tune it a bit up as swapping to a 40hp engine makes the boat very dangerous, heavy and unstable. What are your opinions regarding upgrading the engine. Thought off tune the reeds distance and carb or porting.. Propeller I'm running 9.9 x 13 3 blade aluminium and doing 36mph at the moment.

Thanks Guys your help would be really appreciated
or ask the guys at winrace, i think this was a winrace first, then a hurricane, so a cyber. There are quite a few running 40 hp two strokes here in Norway.
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