Yamaha Discussions about Yamaha ATVs.

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Old 01-14-2008, 09:06 PM
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my friend and i had a discussion on horsepower????? he thinks his foremen 450 has 12hp and my grizzly 660 about the same . anyone have a clue???????????????
 
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Old 01-14-2008, 10:18 PM
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No...

My Wolverine 450 has 26hp so his Honda should have around the same and I think the 660 has around 50hp.
 
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Old 01-15-2008, 12:04 AM
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<div class="FTQUOTE"><begin quote>Originally posted by: grizzhog

my friend and i had a discussion on horsepower????? he thinks his foremen 450 has 12hp and my grizzly 660 about the same . anyone have a clue???????????????</end quote></div>


My Briggs & Straton snowblower has almost 12 hp. I think the 250cc ATVs have more than 12hp.
 
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Old 01-15-2008, 12:42 AM
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<div class="FTQUOTE"><begin quote>Originally posted by: ss454

No...



My Wolverine 450 has 26hp so his Honda should have around the same and I think the 660 has around 50hp.</end quote></div>

I'm assuming you're referring to crank hp right?
 
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Old 01-15-2008, 01:46 AM
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originally posted by 2fast4urass on dec 17th

Can-Am Outlander 800__61.7 hp
Can-Am Outlander 650__55.4 hp
Kawasaki BF750 Carb___50.1 hp
Sportsman 800_________50.1 hp
Kawasaki BF750 EFI____49.8 hp
Suzuki KQ700__________48.5 hp
Yamaha Grizzly 700____45.6 hp
Sportsman 700_________44.3 hp
AC 700________________41.4 hp
Kawasaki BF650________41.4hp
Yamaha Grizzly 660____40.9 hp
Can Am Outlander 500__40.4 hp
AC 650 H1_____________39.3 hp
Honda Rincon 680______38.5 hp
Suzuki KQ450__________36.7 hp
Sportsman 500 EFI_____36.0hp
Sportsman 500 HO______34.5hp
Honda Rubicon_________33.9hp
Arctic Cat 500________32.0hp
Sportsman 450_________29.7hp
Can-Am Outlander 400__28.9hp
Honda Foreman 4x4_____26.9hp
Honda Rancher 420_____26.1hp
Yamaha Grizzly 450____26.0 hp
Yamaha Grizzly 400____26.0 hp
Yamaha Big Bear 400___22.9 hp

Figured id share this i got it from another fourm and says these numbers come from the crank and not the wheel's..if anyone wants ill link em to the site...</end quote></div>

I dont know about the accuracy of these but having ridden with a lot of these wheelers the comparisons seem fairly accurate.....
 
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Old 01-15-2008, 02:06 AM
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You can look up HP numbers on the California Air Resources Board (CARB) site. You have to convert them from metric but they're certified numbers.

It's also good for getting a heads up on what manufacturers have coming on line as they usually post certifications pretty early on.
 
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Old 01-15-2008, 02:07 AM
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Those number look about right, The Can AM 500 & 650 must be at a high rpm to reach those HP numbers. Kinda like those 600cc Rice rocket motorcycles ,sure they have more HP than some 1000cc motorcycles but the need 11,000 rpm to achieve it, and have half the bottom and mid range torque.
 
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Old 01-15-2008, 05:38 AM
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Kawasaki says my 220 bayou had 17hp@7500 rpm. I upped the compression and put a bigger carb on with a KN filter and took the baffle out. Gotta be in the 20's now. So, I'm getting the same HP as a 400 Big Bear? LMAO

And I KNOW my 230 will out run and out pull the 220,,, probably even with the brakes on and towing a trailer. [img]i/expressions/face-icon-small-tongue.gif[/img]
 
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Old 01-15-2008, 10:13 AM
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30.9 cc are equal to 1 Hp. So the Honda 450 has 14.6 Hp and the Grizz 660 should have 21.3 If you look at the numbers it just doesn't look right, but I work for a man that sales Chuck Wagons and they say their pumping out 340 cc or 11Hp. Things you have to consider are transmission, pipes, and any other thing that may add power.
 
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Old 01-15-2008, 11:28 AM
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<div class="FTQUOTE"><begin quote>Originally posted by: Redneck_giant

30.9 cc are equal to 1 Hp. So the Honda 450 has 14.6 Hp and the Grizz 660 should have 21.3 If you look at the numbers it just doesn't look right, but I work for a man that sales Chuck Wagons and they say their pumping out 340 cc or 11Hp. Things you have to consider are transmission, pipes, and any other thing that may add power.</end quote></div>

Ather Factors Besides Dissplacement.


a DOHC has more power than a SOHC.

2 Valve per cyclinder motors have less power than 4 Valve motors.

High Compression Ratio vs Low compression Ratio motors.

RPM : 100hp @ 11,000 from a small motor is not the same feeling as 100HP @ 4500 from a larger motor.

Carb size 40mm vs a 32mm carb

High Duration Cam vs a low Duration Cam.

My old 2 stroke Ski doo Elan 250 had 12.3 HP but a 250 2 stroke motocross bike has what, 30hp?
 


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