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Garden Tractors Discussion Forum

Re: k161 and k181 difference

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Tom Arnold

03-06-2013 04:38:44

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Both the crank and con rod are different by 1/4". Yes the bore size is the same at 2.938 inches so I don't know how you can bore your engine out and end up with the same diameter as the larger displacement engine.

You say your bore measures 2 7/8 but that equals 2.875 inches, not the 2.938 inches shown in the Kohler K manual. Perhaps you are not using the correct tool to measure your bore.

Why not stick with the 7 HP engine by purchasing a new con rod and getting the crankshaft polished? i don't think that one more HP is going to make a huge difference for you. Take the bore to 10 thou oversize, do the valves, make sure the head and deck or dead flat. Install new valve guides and springs.

Parts to do this are readily available on e-Bay.

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03-06-2013 05:49:45

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 Re: k161 and k181 difference in reply to Tom Arnold, 03-06-2013 04:38:44  
it's not the 1 more horse power i am trying to get, its just the correct parts for the correct application.

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03-06-2013 05:47:53

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 Re: k161 and k181 difference in reply to Tom Arnold, 03-06-2013 04:38:44  
i am working with a 1961 Cub Cadet Original with a Kohler K161 (small bore)
the k161 had a small bore (2.875) (prior to a certain spec# which mine falls under) and a large bore(2.938) mine is the small bore and is egg shaped, so a rebore is neccasary, i was told you cant get the K161 small bore piston /rings/.010 over /rod .010 under anymore so you have to bore to a k181 std.which is 2.938. i do have a good source for parts,i am going to do all valves, deck,head, etc. on brian miller garden tractor tips site, he stated that a k141 will need to be bored to a 2.938 because the oversize piston and rings are not available, so i would think a k161 is do-able on the boring to a 2.938. is that correct?

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03-06-2013 08:26:29

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 Re: k161 and k181 difference in reply to calcubman, 03-06-2013 05:47:53  
This might help you out.

The rod can be bought .010 undersized. I would go with the larger bore and be done with it.

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03-07-2013 11:33:12

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 Re: k161 and k181 difference in reply to dhermesc, 03-06-2013 08:26:29  
thanks for the info. i ordered the kit std piston & 10 under rod.

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03-08-2013 09:54:52

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 Re: k161 and k181 difference in reply to calcubman, 03-07-2013 11:33:12  
I've used that supplier on K321 and K301 engines - never let me down yet.

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