Wossner 3XV R/RS Piston Kits Coming Soon - Pre Order Yours Now

[jcsnook]

Is there a cut off date?

Tony, sort of...there will be a need to "commit to purchase" once I hear from Wossner that they are finished measuring my piston and are ready to make the first batch.  I should be able to cover the 50% deposit needed to get them started, but will need your payment when they are completed and ready to ship to me.  That's when I must settle up with them.

I wish I had firm dates to give you, but I do not (yet).  I suspect they will be able to provide me with some firm timeframes once they are ready to start producing, I will have to ask.

I'll pay but don't post it immediately until we know there is no issues.

No worries Paul...I'll let you.  Keep an eye on this thread for updates.

[jcsnook]

Good news, some progress with Wossner Germany.  I received via fax the sketch below (and attached).



They are awaiting deposit and the total number of pistons needed.  Should you have any questions/concerns with the anything, please ask and I can pass onto Wossner USA.  I don't think Mark asked how long it would take them to run this first batch of pistons, but at only 16, I can't imagine it would be very long.

So, if everyone that's wanting to purchase piston kits could please PM me with their info and current status, I would very much appreciate it.  Those that don't respond will not be ordered piston kits.  I will try and PM those that are listed as "comitted to buy" myself for a status, but please follow up with me if/when you read this.  Even better, if you could paypal me a deposit, I would be even more warm and fuzzy that I won't be left with a bunch of spare 3XV R/RS pistons.

[EEKNOWS]

Just something you might want to ask about as recently(last year) we have had issues with sinking domes on Wossners. It might be OK for a soley road bike but anything track or even spirited road use might cause this to occur. By the drawing you can see the dome is only 5.3mm thick, most cast aftermarket and OEM pistons are 6min and almost 8mm max. If your at a track day and the engine suddenly goes "off/flat"  for no apparent reason, the dome will have sunk. 

[Jakes]

Looks like it's 6.6mm EEKNOWS? Or am I looking at the wrong bit? 

[Paul]

I haven't had a PM but I can PayPal you if you send me your email.

[EEKNOWS]

Looks like it's 6.6mm EEKNOWS? Or am I looking at the wrong bit?

56.3mm to top of dome
51mm to underside of dome
=5.3mm

Looks like 6.6mm to the  bottom of the ring groove

[Lane]

I take it these are forged and so require a longer warm up time?

Would it be safe to say these will end up lighter than the stock pistons?

[EEKNOWS]

I take it these are forged and so require a longer warm up time?

Would it be safe to say these will end up lighter than the stock pistons?

Not usualy they will be the same mass as the OEM

[Wullie3XV9]

Jim, I've sent you a deposit to secure a pair of these here piston kits. Many thanks for all your hard work on this. 

[jcsnook]

Just something you might want to ask about as recently(last year) we have had issues with sinking domes on Wossners. It might be OK for a soley road bike but anything track or even spirited road use might cause this to occur. By the drawing you can see the dome is only 5.3mm thick, most cast aftermarket and OEM pistons are 6min and almost 8mm max. If your at a track day and the engine suddenly goes "off/flat"  for no apparent reason, the dome will have sunk.

I will ask EE, thanks for that.  Question tho...what particular make/model/type bike were the problem Wossner pistons in, and, how thick were the domes of those pistons if you know?  I suspect they will be asking...

So a minimum of a 6mm thick dome is desired?  What will that do to piston weight, as you mention...we want them to be equal mass to the stock piston.  I would expect that these dimensions are a direct copy of the Mama Yama's piston no?

Jim, I've sent you a deposit to secure a pair of these here piston kits. Many thanks for all your hard work on this. 

Got it Wullie...thx!

I haven't had a PM but I can PayPal you if you send me your email.

Sorry Paul, went out to eat with the family last night an didn't get to it yet.  My oldest is returning to college today    Responded to your PM tho, so all is well...

[Paul]

okay, no probs, i slapped $150 in. thanks.

[EEKNOWS]

The problem is confined to this year, last year we had zero issues. To date we have 8 or 9 lunched pistons. Every piston has a thumb size depression between the centre of the crown and the timing edge on the exhaust side. Piston is an Aprilia GP, dome is 5mm thick on one side and 6mm the intake side. They have been lasting as little as 8 laps of a circuit. However I have esed 3 in MX 125's despite having 15 yr olds flog the bike mercilessly they hold up well. Even 2mm extra thickness would be lucky to add a gram.

[Paul]

i am up for a little improvement if possible

[jcsnook]

The problem is confined to this year, last year we had zero issues. To date we have 8 or 9 lunched pistons. Every piston has a thumb size depression between the centre of the crown and the timing edge on the exhaust side. Piston is an Aprilia GP, dome is 5mm thick on one side and 6mm the intake side. They have been lasting as little as 8 laps of a circuit. However I have esed 3 in MX 125's despite having 15 yr olds flog the bike mercilessly they hold up well. Even 2mm extra thickness would be lucky to add a gram.

Thanks for that...

[yanw]

It might not been any use but I will be in Frankfurt for a week mid February. I can check with work but you might be able to get them/some sent there and I can post them on at cost to SA/KZN/UK etc if you like.

It might turn out cheaper and possibly sneak past the customs and their tax-stick.