Horse power on 735cc engines?

[hlw49]

My 651V Kawasaki is rated @ 21.5 Hp, & with carb tweak, it can become 691V @ 23 hp, & again tweaked further, it becomes the 730V @ 24 hp, same bore & stroke. And all 726cc. So mine is living easy imo.

• Displacement​

  726 cc (44.3 cu. in.)

• Bore x Stroke​

  3.1 x 3.0 in. (78 x 76mm)

Not that easy on some of those engines they limit the throttle opening with the lever on the carb throttle shaft. They may also be playing games with hp rating and just call it a different hp than it actually is. They can call it less hp and get by with it but not more hp.

 

[7394]

I hear ya, I do know my 21.5hp Kawasaki won't bog down like the neighbors 25hp Briggs when we cut his same grass.

 

[bertsmobile1]

They also slip restrictive gaskets between the carb & the manifold
Honda do that on all of their engines
when carb jet size used to be done you could see from the IPL's that different engnes had different jets but now days looks like they only list a& sell the single largest jet
I came across that when I did a jet replacement on a badly corroded carb and the owner came back wanting to know what I had done because the machine now did things it could not do before

 

[hlw49]

Craftsman use to be bad about listing hp of the engine different than the model no. of the mower have a Kohler that is a CV 20 that the mower said it was a 18.5

 

[ILENGINE]

Craftsman use to be bad about listing hp of the engine different than the model no. of the mower have a Kohler that is a CV 20 that the mower said it was a 18.5

Most of the ones on Craftsman that I saw were higher HP on the mower than what the engine said. which was the basis for the lawsuit over HP ratings. Craftsman was the primary defendant in the case followed by Briggs. Kohler didn't have to change how they rated their engines since they were not playing the HP game.

 

[Hammermechanicman]

Anyone remember the 11, 11.5 12 and 12.5 HP briggs flathead engines that basically identical?

 

[Rivets]

If my memory is any good, those where the engines which got Briggs in trouble and started the questionable hp lawsuits.

 

[ILENGINE]

There was a lot of shenanigans going around with HP ratings. Craftsman with using higher HP ratings on mower claiming to use a different rating system. Like the hood said 23 hp but the Kohler command under the hood was a CV22. Briggs the engines listed above but also a case of a customer having a MTD mower with a 4.25 hp engine on his mower. the problem was there was also a 3.75 sticker under that sticker and was found when the top stick came loose. Heard a case of a Toro dealer ordering his spring stocking order and the model listed 17.5 hp Briggs engines but when they arrived had 15.5 HP engines. And when the dealer inquired about the engine change was sent replacement 17.5 HP stickers to replace the 15.5 on the engines.

 

[Rivets]

I remember those stickers. Lucky the dealer I worked for only had four of those units.

 

[hlw49]

CV20 off that Craftsman now sits on my 2000 X1901 Dixie Chopper