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Old 11-20-2017, 02:37 PM
Terry C's Avatar
Terry C Terry C is offline
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Location: Iowa
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Default 7hp or 8hp

I need to identify this k-series
It’s either a 161 or a 181.
Bore is 2.937

My thing is that when I tried a 7hp rod, the piston stuck up above the deck.
So an 8hp had more stroke than a seven?

I’m trying to help out a friend of mines kid. It’s a long story but it boils down to “ no good deed goes unpunished”.
The kid in his excitement ordered 7hp components(.020piston and .010rod gaskets ect). I was handed a box of stuff and an engine. Nothing seems like it’s going to work out.
Was in a 70. Can’t read anything in the nameplate

Thanks
Terry
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Old 11-20-2017, 03:06 PM
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Green stripe wide frame Green stripe wide frame is offline
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They both have the same bore. But the stroke is 2.5 for the k161, and 2.75 for the k181.
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Old 11-20-2017, 03:24 PM
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I’ll check the stroke Thanks
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Old 11-20-2017, 07:11 PM
J-Mech J-Mech is offline
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Quote:
Originally Posted by Green stripe wide frame View Post
They both have the same bore. But the stroke is 2.5 for the k161, and 2.75 for the k181.
Correct. Kind of....

The early 7hp's also had a smaller bore. They can be bored to the larger bore. Original bore for the early 7's is.....smaller, lol. I can't find the spec, and I don't remember it. 2.750"???
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Old 11-20-2017, 07:43 PM
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I checked stroke. It’s an 8.
Thanks for the help fellas
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