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  #1  
Old 04-30-2015, 04:57 PM
1965slocub 1965slocub is offline
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Default Cub 70 bore size.

Working on a Cub 70 with K161 engine. Need to find the original bore size so I can search for replacement piston and ring set. It is the small bore type. Thanks,Jim.
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  #2  
Old 04-30-2015, 04:59 PM
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No one sells part for that smaller bore anymore so you'll have to get a standard piston for the larger bore and have it machined out.
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Old 04-30-2015, 05:35 PM
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IIRR as it has been a while since they were new, they were 2.875 for the small bore and 2.938 on the large bore.
But somebody might still have some NOS small bore stuff around.
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Old 05-01-2015, 01:10 PM
1965slocub 1965slocub is offline
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Thank you both for the info. Machine shop wants $285.00 to bore out. More than the owner wants to spend. My search continues. Jim.
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Old 05-01-2015, 01:29 PM
raytasch raytasch is offline
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Why not a cylinder hone and DIY? Is this type stuff still done? Not that much to take out.
Been a few years since I've had any machine work done but that seems like that shop does not want to do the job at that price.
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Old 05-01-2015, 03:28 PM
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Quote:
Originally Posted by raytasch View Post
Why not a cylinder hone and DIY? Is this type stuff still done? Not that much to take out.
Been a few years since I've had any machine work done but that seems like that shop does not want to do the job at that price.
A cylinder hone will not straighten up the bore, if the cylinder is egg shaped then it will still be egg shaped when your done.
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Old 05-01-2015, 04:15 PM
raytasch raytasch is offline
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A cylinder hone will not straighten up the bore, if the cylinder is egg shaped then it will still be egg shaped when you're done.

Guess I misspoke, err mis typed. I had in mind a cylinder grinder such as these two. The picture is one my dad had and I've seen more than one bad cylinder brought back to useful life using it. The link is to a current version by Lisle.

http://www.nationaltoolwarehouse.com...ampaign=bingPA

Edit: One of these in a drill press and a small engine can be done quite easily.
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122 original, well used. Owned since 1972
2182 new to me. Refurbished and gave to my son.
Deere 4300 4WDA HST with FEL
Many old Ford tractors, all gone now
Couple old Ford trucks
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Old 05-01-2015, 04:42 PM
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Well at $285 for one hole this shop should be charging $2280 to do a V-8. I don't think they want your business. Just my 2 cents.
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Old 05-01-2015, 05:50 PM
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Think I'd find another machine shop!
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Old 05-01-2015, 05:55 PM
Darrell Darrell is offline
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Definitely find another machine shop !!!

The last K Series i had bored cost $60.00 , and i thought that was high !!!
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