Have you removed balance gears from your K-series engine and discovered that it now vibrates with newfound
gusto? Or have you thought about buying a newer, twin-cylinder tractor just to get rid of the single-cylinder
shakes? This modification will greatly reduce transmitted vibration, making your K-series engine run
noticeably smoother, restoring both your faith in Kohler and the feeling in your hands and feet.
A 50% RBF (Reciprocating Balance Factor) is a good compromise in reducing transmitted vibrations from a
single-cylinder engine. For reasons unknown, Kohler engineers under-balanced these engines (only 29% RBF on
the K301) such that they transmit unnecessarily high unresolved reciprocating forces about the vertical axis.
Installing the Crankshaft Balance Plate Kit restores a 50% RBF to the engine, making for a much reduced
vibration signature. The improvement in crankshaft balance yields lower main bearing loads contributing to
longer engine life, reduced transmitted vibrations, and greater operator comfort.
This inexpensive kit requires simple and straight-forward machining of your crankshaft which can be
done at a local machine shop in usually less than one hour. Or, if your personal shop is equipped with a
mill and drill press, you can easily do it yourself. No further balancing of the crankshaft assembly is
required if installed per the instructions. The kit consists of a precision formed, high-quality steel
Balance Plate, two grade 8 mounting screws, and detailed instructions. This modification is for Kohler
K301, K321, and K341 single-cylinder engines only.
Click Here for Balance Plate Instructions
We now offer machining of your crankshaft to accept the Balance Plate. Send us your crankshaft and we
will machine and install the Balance Plate for a professionally done job. Price includes Balance Plate.
Machine and Install Balance Plate on Customers Crankshaft - $120.00 plus $17.00 Priority Mail
Crankshaft Balance Plate Kit price each - $20.00 plus $4.00 Priority Mail Shipping