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Old 04-04-2002, 11:18 PM
khouse khouse is offline
LawnSite Bronze Member
Join Date: Feb 2001
Location: lee's summit, mo
Posts: 1,476
By raising the rpm's you may make the mower run faster but the hp rating and torque will drop. It will just seem like it's more powerfull. The most realistic way of getting 2 more hp is to put a 20 hp unit on it. There are other things you can do to a standard engine to increase hp like increasing the bore and or stroke, raise compression,hotter camshaft ect. You will have much more money in it than it's worth. For about $1500.00 you can make a 5 hp briggs turn out 11 to 13 hp @ 8500 rpm's. But you wouldn't want it on a mower.
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