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Author Topic: pistons, wrist pins, and con rods OH MY!  (Read 826 times)

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Offline BomberMann650

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pistons, wrist pins, and con rods OH MY!
« on: April 06, 2017, 07:38:42 PM »
general question - something I noticed after tearing apart a few *different* engines.

should there be any discernable play on the piston/wrist pin/con rod joint?  aside from side to side?

the "runinwenparqued" 750triple motor has really firm feeling wrist pins compared to my cb550.

asking because rebuild, thanks
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: pistons, wrist pins, and con rods OH MY!
« Reply #1 on: April 06, 2017, 10:30:42 PM »
That sounds about right. Oil up the pins and they are a tightish fit.
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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline disco

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Re: pistons, wrist pins, and con rods OH MY!
« Reply #2 on: April 06, 2017, 10:31:19 PM »
Hondaman states if you have more than .004" clearance between wristpin & piston....they're toast!
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1976 CB750 K6 Sapphire Blue
1972 CB750 K2 836 Orange Sunrise
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Offline BomberMann650

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Re: pistons, wrist pins, and con rods OH MY!
« Reply #3 on: April 07, 2017, 12:20:52 PM »
Quote from: disco on April 06, 2017, 10:31:19 PM
Hondaman states if you have more than .004" clearance between wristpin & piston....they're toast!

Seems I need to get some of the narrow feeler guages.
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Offline Smudgemo

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Re: pistons, wrist pins, and con rods OH MY!
« Reply #4 on: April 07, 2017, 01:00:54 PM »
Quote from: BomberMann650 on April 07, 2017, 12:20:52 PM
Seems I need to get some of the narrow feeler guages.

I think you're joking, but I'd try a mic and a hole gauge. 
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Offline BomberMann650

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Re: pistons, wrist pins, and con rods OH MY!
« Reply #5 on: April 07, 2017, 01:31:38 PM »
Derp  :P
You're right, wrong tool
Thanks Smudgemo
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