[Chris Reinhardt]

It looks like they all cross to that 506 piston, the others must be NLA…

Usually, you order a “A” piston for a “A” cylinder, but the difference very minimal, actually .0003″ smaller on the “B” according to the manual… But there’s a .0003″ spread for each, so a small “A” piston, might be the same as a large “B” piston…

You can try ordering a 13110-KZ4-A40 and see what happens, you’ll probably get a 506…

CR

[Chris Reinhardt]

Dupe

[Valentin Yakimenko]

Thanx!

[Troy V Smith]

Hmmmm?  Well, now that this came up, I went to the shelf and pulled a A40 A piston and a 506 B piston and did a measurement.  Yes, Chris is right the difference is very little – the “A” piston diameter measured just above the ring grove was 53.761 – the “B” piston (which I though was supposed to be slightly larger), is actually measuring smaller at 53.745mm.  What gives – this screws up my plan! LOL

What would be the benefit of using a smaller piston Chris? I could see going larger after enough wear in the cylinder, but smaller?  How much sidewall clearance is “required”?  Why wouldn’t one want to start with “B” piston and progress to an “A”?

[Valentin Yakimenko]

+1^

[Valentin Yakimenko]

All pistons superseded by 13110-KZ4-506 …

[Author]

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