Woss has made vintage pistons once they saw even low demand and maybe little no profit.
For example Yam R5 and beyond 1.0 mm OS, Kawasaki S3/KH400.
If no one buys/asks won't make. (asked about gt550 for example) Asked about t500 rods
Picked up some NOS Wiseco for GT380. Crown dome peek much less height than oem ... loose compression significantly and very heavy. No weight relieves above pin (I could add)
I don't think they are the same. I have both I'll check again (may be a day or two before I can)
I think the issue is space between rod small end. You know, the thing cruzin got wrong by 1mm too much for GT750.
At the time I got the Cruzin GT750 piston I checked to see if they could work on a T500 I though it could not but forget why, that distance and was not correct is what I am thinking.
again I have both as OEM's and will check.
Given what Cruzin did on repo of GT750 that's why my first reply to this post stated I don't know of anyone who has compare T500 OEM dimension to cruzins T500 repos. His supplier does mess up a lot be it minor or major in your opinions.
I never verified wossner either. But someone could email J. Noonan to verify theirs have different part # if they need to be different ( I may if no one else once I find out). He has treated me well. I get the feeling they are less interested in reproducing due no one buying.
I would be good if he here's from us that there is interests in this old stuff.
Again I may need a couple days. Started new job and work load is just crazy at the moment
GT750 and T500 and gt500 are all the same,Only the early 750 piston are different as they did not have the thrust washers on the small end,but had them on the big end,
That's positively stated info old acer, ta. Now, not to make this all too complicated but it would be useful to establish a good reference for anyone re: GT/T pistons:
My standard Suzi GT500 pistons are marked L and R, - I've assumed this is about port cutaway positioning or maybe gudgeon offset or whatever, otherwise why would they be 'handed'? So would GT750 pistons be marked Left, Centre, Right or what? How does this work?
Old Racer can you give us some idea of "early GT750" Engine number, year etc, -just that we may need to double check with a supplier exactly what they are supplying.
And with the T and GT, are the rings all the same?
Thanks for everyone's input BTW.
Early pistons were less wide in the small end to work with the conventional conrod design. They had normal thrust washers on the big end and a small amount of float at the small end.
The crank was changed to eliminate the big end thrusts and replace them with simple spacers. Pistons were machined slightly wider at the small end to allow for thrust washers in the piston pin. I suspect that I am the only one to have opened a box recently to discover old style pistons which was unfortunate.
In theory only J and K models had the early pistons 12120-31000replaced by 12120-31001 on L and M and A used 12120-31002 (left and center). It's spelled out in the parts book and in Suzuki Bulletins which are on the Oldjapanesebikes (Ian Sandy) site. Look for Bulletin GT-6 dated May 1 1975 with all the details. Conrods and crankwheels changed at the same time and are not interchangeable.
joolstacho wrote:That's positively stated info old acer, ta. Now, not to make this all too complicated but it would be useful to establish a good reference for anyone re: GT/T pistons:
My standard Suzi GT500 pistons are marked L and R, - I've assumed this is about port cutaway positioning or maybe gudgeon offset or whatever, otherwise why would they be 'handed'? So would GT750 pistons be marked Left, Centre, Right or what? How does this work?
Old Racer can you give us some idea of "early GT750" Engine number, year etc, -just that we may need to double check with a supplier exactly what they are supplying.
And with the T and GT, are the rings all the same?
Thanks for everyone's input BTW.
Vintageman wrote:John Noonan
Sales Manager
Wossner Pistons john@woessner-usa.com
Ph. 714-369-8879
Wossner good stuff. too
FWIW:
I'll vouch for them too.
I've used Wossners in several builds including very stressed H2 and H1 engines and have been VERY happy with them and their wear characteristics. When you open the box, you will agree that they look like pieces of engineering art and not something that should be tucked inside your engine. I used weighed assemblies and although I don't have the numbers here, they weighed much less then NOS and were also pretty even as received and took very little massaging to get all in a set equal.
John is excellent to deal with too.
Like many others, I've been tempted by CI's low prices. Who wouldn't given they give you a whole set for the cost of one high quality piston assembly but I've always manged to find the funds to buy, if nothing else, peace of mind and to me, it's worth the premium.
... loose compression significantly and very heavy. No weight relieves above pin (I could add)
