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  #1  
Old 06-28-2019, 07:56 PM
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Default K161 bore size

Does anyone happen to know the serial number break from when they swapped from the small bore k161 to the large bore?
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Old 06-28-2019, 10:45 PM
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It is better to investigate what you have, then guessing, as things change as owners/ people work on them.
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Old 06-29-2019, 02:12 AM
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Quote:
Originally Posted by ol'George View Post
It is better to investigate what you have, then guessing, as things change as owners/ people work on them.
I'm more curious than anything. I only have one engine that I was willing to tear into and its 668300. It is a small bore so I at least know the number is higher than that
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Old 06-29-2019, 07:08 AM
R Bedell R Bedell is offline
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I can't say that I ever heard of a small and large bore for the K161. There is NOTHING in the Kohler K Series Service that mentions that.

However, there is a bore difference between the K161 and the K181 when Cub Cadet started substituting the K181 for the K161 in replacements.
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Old 06-29-2019, 07:25 AM
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Quote:
Originally Posted by cubby102 View Post
I'm more curious than anything. I only have one engine that I was willing to tear into and its 668300. It is a small bore so I at least know the number is higher than that
I will see if I can find something in my old books, I do remember the difference.
I have a small bore engine around here some place.
I think it might be a engine from an original that is a rope start.
as far as tearing into an engine, all one has to do is remove the head, and measure the bore.
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Old 06-29-2019, 11:03 AM
bill682 bill682 is offline
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K161 engine spec numbers prior to 281162 have a 2-7/8" bore, after that spec number they have a 2-15/16" bore.
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Old 06-29-2019, 07:01 PM
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This is from page 1.2 of Kohler Single Cylinder Service Manual ENS-575 Revision 4-72.

Here is a link to the manual....

https://www.gravelymanuals.com/pdf/K...v_Man_0472.pdf
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