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Kohler Magnum 18 And 20 Question


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#1 farmer john OFFLINE  

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Posted October 19, 2013 - 10:41 AM

hi guys; i have a bolens gt 20 hydro with a bad motor, running on one cylinder, no compression, has a kohler magnum 20 in it, i found a roper with a kohler magnum 18 for $300, motor is good, would it be a direct and easy switch? my kohler manuels show these motors on the same manuel are they the same , little bigger piston? larger carb? what would be the difference? thanks john



#2 Canawler OFFLINE  

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Posted October 19, 2013 - 11:38 AM

The 18 and 20 are basically the same engine.  They share op and service manuals.

The bores are the same but the 20 has a longer stroke.

As far as interchangeability, I image the crank snout size and style could be different depending on the spec numbers.



#3 HDWildBill OFFLINE  

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Posted October 19, 2013 - 12:05 PM

As Canawler said they are basically the same engine.  I would think it would bolt right up and depending on what you are using the tractor for you would only notice a slight down grade in power.



#4 JDBrian OFFLINE  

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Posted October 19, 2013 - 08:06 PM

A small downgrade, but It should definitely have more power than the 20 running on one cylinder! 






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