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Reload this Page Rebuilding my KT17, piston size question
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  #1  
Old 12-03-2014, 09:18 AM
kyleb179 kyleb179 is offline
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Default Rebuilding my KT17, piston size question
hey all. so i have the engine torn down and as far as i can tell, it is the first time it has been apart. so my question is this, the piston is stamped .003" on the top, is this the standard bore? the bore measures 3.125" the piston measures 3.097"

does this seem correct for standard? i have the engine manual, i cant find a clear definition of "stock" size.

thanks all
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Old 12-03-2014, 11:26 AM
J-Mech J-Mech is offline
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Well..... it can't be undersized, so yes that is a stock bore.
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Old 12-03-2014, 11:30 AM
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Calvins66Cub Calvins66Cub is offline
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Have you measured for roundness, taper?
Take several measurements on the piston and bore.
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Old 12-03-2014, 11:38 AM
kyleb179 kyleb179 is offline
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yes i measured the bore with a dial bore gauge, found less than .001 deviation within the cylinder. perks if working in an anal-retentive mold shop is having it drilled in your head to measure everything in multiple ways lol.
thanks j-mech and calvin.
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Old 12-03-2014, 11:49 AM
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Calvins66Cub Calvins66Cub is offline
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According to the KT manual, you should have .006-.008 clearance.
3.125 is the stock bore. Your piston should measure 3.117-3.119
3.1165 is the max wear spec.

3.097 seems like a mic misread, or it is extremely worn.
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Old 12-03-2014, 12:02 PM
J-Mech J-Mech is offline
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Quote:
Originally Posted by Calvins66Cub View Post
3.097 seems like a mic misread, or it is extremely worn.
Or measuring the piston in the wrong spot.
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Old 12-03-2014, 12:29 PM
kyleb179 kyleb179 is offline
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gauge was set incorrectly, one piston measures 3.1175 and the other 3.118. getting close but i think we'll be okay!
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Old 12-04-2014, 11:25 AM
NCDiesel NCDiesel is offline
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Quote:
Originally Posted by kyleb179 View Post
hey all. so i have the engine torn down and as far as i can tell, it is the first time it has been apart. so my question is this, the piston is stamped .003" on the top, is this the standard bore? the bore measures 3.125" the piston measures 3.097"

does this seem correct for standard? i have the engine manual, i cant find a clear definition of "stock" size.

thanks all

I have a question: I thought .003 designation was a "service size" piston. In short, they are used on engines with slight out of round issues but no real wear. The bore would be made round(so now .003" bigger), the service piston installed, and all was well. In this case however, I would expect the bore in this case to be 3.128 or higher though - not 3.125.

Am I wrong or missing something?
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Old 12-04-2014, 07:23 PM
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Been my experience .003 meant piston was +.003 oversize.
possibly someone put it in a slightly worn bore, and the piston was not new and was less than .003 oversize from wear.

Many a time I got a new set of .010 over rings and custom fit them in a worn Std size bore.
We did a lot things in the early days when money was tight, or we were in a time constraint.
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Old 12-04-2014, 10:31 PM
J-Mech J-Mech is offline
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We did a lot things in the early days when money was tight, or we were in a time constraint.
Back before it cost a small fortune to do those kind of things. Now days, with tighter tolerances, and expensive parts..... not as good of a "cost savings".
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