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Jet Boats
General Jet Boat Discussions
Upgrade YAMAHA 40HP to 50HP ?
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<blockquote data-quote="mphelle" data-source="post: 419346" data-attributes="member: 7962"><p>I've done this to a 1988, gained about 400rpm. The part diagrams on boats.net are a bit confusing but the carbs on the 40 are smaller and the exhaust tube used on the 40 is really restricted. Yamaha built the 50 and then de-tuned it to market the 40, you'll know what I mean when you see the restriction added to the exhaust tube.</p><p></p><p>Not great pics but you get an idea of the relative sizes of the venturi.</p></blockquote><p></p>
[QUOTE="mphelle, post: 419346, member: 7962"] I've done this to a 1988, gained about 400rpm. The part diagrams on boats.net are a bit confusing but the carbs on the 40 are smaller and the exhaust tube used on the 40 is really restricted. Yamaha built the 50 and then de-tuned it to market the 40, you'll know what I mean when you see the restriction added to the exhaust tube. Not great pics but you get an idea of the relative sizes of the venturi. [/QUOTE]
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Jet Boats
General Jet Boat Discussions
Upgrade YAMAHA 40HP to 50HP ?
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