View Full Version : 5 hp

the ace
05-28-2009, 12:33 PM
Was wondering if any one knows how much hp can you get out of a 5hp honda engine if you did some modifications to it? I have about 20 lawns where anything larger than a 21" mower is not an option and after buying a commercial 21" toro I'm just not impressed with the power at times so I was wondering if, a.) it's possible to monkey with the engine and get some serious power out of it and b.) is it even worth it?

05-28-2009, 10:28 PM
The only thing I would suggest is putting a tachometer on the engine and make sure the high speed rpm's are set at 3600, Anything more is just asking for trouble.

05-28-2009, 11:27 PM
Most 21s come out of the box at about 2800 rms - 3000 rms. So bump it up to 3600 and you should be happy.