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#1
07-15-2013, 11:30 AM
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1996 K301 replacement engine
I've a '96 K301 spec 47504. I thought all K301's had the flat section on crank counter weights. Mine are round. One thick, one thin. Both valves have rotators. Style D Mahle piston. Has balance gears. Fully adjustable Walbro WHG carb A few questions.
1. Any significance to the round counterweights vs flat ? 2.Are valve rotators meant to keep seats cleaner ? 3.How long has Kohler used Mahle pistons ? 4.Has anyone kept the balance gears ? 5.Is the K301 the most out of balance single K engine ? Chris
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1968 104 , service replacement '96 K301, 42" deck 1997 Scotts 42502X8 , repowered with '96 B&S 18hp TwinII , 42" deck 2007 LA130,21hp Intek v-twin, 48" deck  As you slide down the banister of Life, may the splinters point in the right direction . 
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#2
07-15-2013, 12:50 PM
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Here are my answers:
1. Any significance to the round counterweights vs flat ? I have no idea 2.Are valve rotators meant to keep seats cleaner ? Valve rotators are meant to rotate the valve so that it seats at a different spot each time. Not necessarily for keeping clean, they are for keeping the valve and seat sealing properly. It keeps them from wearing on one side. 3.How long has Kohler used Mahle pistons ? I have no idea 4.Has anyone kept the balance gears ? Some people do, some don't. I prefer to. 5.Is the K301 the most out of balance single K engine ? No, 301 up has balance gears. I'd say it starts with the 301 because the bore finally got big enough that the weight of the motor rotating assembly became large enough it needed more balance help. ANY odd number cylinder motor is "out of balance". Single cylinder, 3 cylinder, 5 cylinder.......
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#3
07-15-2013, 03:51 PM
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J-Mech, thanks for the response. I'm leaning toward leaving the balance gears in. It's a low hour engine in great shape. I keep reading horror stories about grenade gears wreaking havoc and destroying blocks. I just wonder if the balance gears get blamed far more than other causes. I'd bet Kohler didn't put them in just for the hell of it. Chris
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1968 104 , service replacement '96 K301, 42" deck 1997 Scotts 42502X8 , repowered with '96 B&S 18hp TwinII , 42" deck 2007 LA130,21hp Intek v-twin, 48" deck As you slide down the banister of Life, may the splinters point in the right direction .
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#4
07-15-2013, 05:14 PM
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Flat vs. round, see this:
http://************************.com/index.htm. Leave balance gears in? Never.
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John Proud Owner of a Model 100 and a Model 124. A homemade cart, 2 x 42" mower decks, a 38" deck, a 42" front NF blade, and a lawn sweeper!
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#5
07-15-2013, 05:37 PM
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Quote:
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#6
07-15-2013, 06:00 PM
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Try to google: Welcome to Brian Miller's Garden Tractor Pulling Tips & Tricks!
Then scroll to : Balancing the crankshaft and connecting rod assembly. Occ won't let me type the URL, sorry.
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John Proud Owner of a Model 100 and a Model 124. A homemade cart, 2 x 42" mower decks, a 38" deck, a 42" front NF blade, and a lawn sweeper!
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