1200 UL pistons origonal or copys

Hi
Ive just recieved from Bills old bike barn some supposedly origonal pistons which i purchased from him off ebay. Item No 110376225683 They advertised them as being in their origonal boxes and covered in the old grease they used to use to protect them, I recieved them today no origonal boxes and pistons were not covered in the grease like they were described on advert. Inside the pistons is a name BOHNALITE L does this mean anything to anyone, could this be the manufacturer? Also the pistons are marked 317-384 is this the correct number, how can i tell if they are nos or copys?
I enclose a pic of the piston. Any info please as id like to get this sorted out!!!
regards
cooky

Does the bottom ring land has the same height as the top ring lands? If so they're probably NOS pistons. Bohnalite made pistons for harley.
karl.

they look like the real deal, at least as I remember them.
DD

OEM for sure.

The 3 piston rings look the same to me, shouldnt the bottom ring be a oil control ring? They look all like compression rings. I have read somewhere that on the front cylinder they used all the same rings but on the rear they had an oil control ring, why is this?
Could i convert these pistons to take later oil control rings with the two very thin rings and the wavy ring?
regards to everyone for their help


Cooky..........

Reproduction piston

Cooky, be careful what you ask.....
The original configuration was indeed, 3 compression rings on the front, and 2 compression and one shallowly grooved, but not vented "oil control" ring on the rear. It usually wore smooth with use and looked like another compression ring after some use. Unless you alter the oiling system, probably the best bet is to go with the stock configuration, using 3 compression rings on the rear if you can't come up with the stock pseudo oil ring.
Otherwise, if you decide to run other than stock oiling system, (including baffles, or not, etc) I'd read all the past posts on the board on the big twin flathead oil system, and decide what suits you best. That's all I'm going to say guys, honest!
DD

Hey DD. Please keep talking.
I mean, sportypump sportypump sportypump
bahahahaha
We all love sportypumps!
karl

Thanks Karl, for the best laugh in days!
DDD, (Demented Dr Dick)