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General Jet Boat Discussions
Yamaha performance bulletin 40/30 vs 60/40
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<blockquote data-quote="dhoganjr" data-source="post: 358146" data-attributes="member: 12925"><p>I don't see how those 2 tests are even close to being accurate, for one the test dates are 13 months apart. That could mean as much as 2 model years difference, the test in 2010 could have a 10 model year and the test in 6/2011 could possibly have a 12 model year. The boat is 20 lbs heavier on the 40 test and is a ccj deluxe model. Wind speed is higher on the 60 test, plus altitude and temp is higher. 0-20 speeds were taken with an aftermarket speedometer, usually not that accurate. There are way to many variables to compare and make a decision from these two reports.</p><p></p><p>IMO you should be able to feel the difference in a 60/40 vs a 40/30. The 60 should pull away, neither will be incredibly fast, but you should get at least 2-3 mph faster. Plus a better holeshot and be able to carry more weight. The 60 won't work as hard to keep it on plane.</p><p></p><p>Just my .02 worth from those 2 reports.</p><p></p><p>(Disclaimer) Don't take it to mean that I'm putting down the 40/30, that is not what I'm getting at, they are good engines. If you are deciding between these 2 try and get a ride in both and decide from there. But I think you'll notice more than the reports say.</p></blockquote><p></p>
[QUOTE="dhoganjr, post: 358146, member: 12925"] I don't see how those 2 tests are even close to being accurate, for one the test dates are 13 months apart. That could mean as much as 2 model years difference, the test in 2010 could have a 10 model year and the test in 6/2011 could possibly have a 12 model year. The boat is 20 lbs heavier on the 40 test and is a ccj deluxe model. Wind speed is higher on the 60 test, plus altitude and temp is higher. 0-20 speeds were taken with an aftermarket speedometer, usually not that accurate. There are way to many variables to compare and make a decision from these two reports. IMO you should be able to feel the difference in a 60/40 vs a 40/30. The 60 should pull away, neither will be incredibly fast, but you should get at least 2-3 mph faster. Plus a better holeshot and be able to carry more weight. The 60 won't work as hard to keep it on plane. Just my .02 worth from those 2 reports. (Disclaimer) Don't take it to mean that I'm putting down the 40/30, that is not what I'm getting at, they are good engines. If you are deciding between these 2 try and get a ride in both and decide from there. But I think you'll notice more than the reports say. [/QUOTE]
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Yamaha performance bulletin 40/30 vs 60/40
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