Piston Part #'s

dirtymartini · Jun 25, 2012

I just removed the head from my '69 "S" to be sent out for exhaust thread repairs. I was cleaning the carbon from the pistons and found these part numbers that don't match up with anything I could find.

06-3362 left and 06-3363 right.

I tried searching all years and didn't come up with anything. I'm guessing they are oversize?

RennieK · Jun 25, 2012

Not sure about that pt#. Make sure they are not slotted pistons that were around in that era. Pistons should have the size stamped on top ie: STD; .010; .020; .030 etc.

batrider · Jun 25, 2012

Those part numbers seem later than the era of the slotted pistons anyway. Could be casting numbers?

dirtymartini · Jun 25, 2012

RennieK said:
Not sure about that pt#. Make sure they are not slotted pistons that were around in that era. Pistons should have the size stamped on top ie: STD; .010; .020; .030 etc.

Me either but I checked the numbers with a magnifying glass. I thought there would be a marking for std or oversize but all I can find is left and right. I searched British CYcle Supplys price sheet and no number exists in their database.

L.A.B. · Jun 25, 2012

The "piston" numbers in the parts books usually refer to: "piston complete" (piston, pin, rings & circlips).

As pistons were normally supplied as an assembly so the individual piston would probably have its own individual part number which isn't listed because the bare piston wasn't available separately.

batrider · Jun 25, 2012

Looks like they are .030" over per British Only price sheet.

http://www.british-only.com/webcatalog/02.txt

dirtymartini · Jun 25, 2012

batrider said:
Looks like they are .030" over per British Only price sheet.

Thanks Russ. It would be hard to imagine the bike still being std bore. I still see crosshatch marks on the cylinder walls so I guess I'm in good shape there.

concours · Jun 25, 2012

dirtymartini said:
batrider said:

Looks like they are .030" over per British Only price sheet.

Click to expand...

Thanks Russ. It would be hard to imagine the bike still being std bore. I still see crosshatch marks on the cylinder walls so I guess I'm in good shape there.

I assume you'll install new rings, measure PRECISELY before ordering, to be sure you get rings that will fit correctly.

dirtymartini · Jun 25, 2012

concours said:
dirtymartini said:

batrider said:

Looks like they are .030" over per British Only price sheet.

Click to expand...

Thanks Russ. It would be hard to imagine the bike still being std bore. I still see crosshatch marks on the cylinder walls so I guess I'm in good shape there.

Click to expand...

I assume you'll install new rings, measure PRECISELY before ordering, to be sure you get rings that will fit correctly.

I'm not going that far, I only pulled the head off to get the exhaust threads repaired.

Piston Part #'s

dirtymartini

RennieK

batrider

dirtymartini

L.A.B.

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batrider

dirtymartini

concours

dirtymartini

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