here is what I got from zupin via email, piston is kinda pricey compared to GP Cycles and FBF, wonder if its better ?
maybe a group buy ?
ZUPIN MOTO-SPORT GMBH
Trostberger Straße 26 · D-83301 Traunreut · Tel.: +49 (0)8669 848-110 · Fax: +49 (0)8669 848-590
www.zupin.de · E-Mail: bestellung@zupin.de
Dear Mr. Pereira,
thank you for your Email and the interesst in our company.
The prices on our Website are in €.
It is possible to ship to USA, but the delivery costs are very high. About 50€.
The Racing Piston and the Racing Cam are perfect optimated for the SM610.
-Articlenumber tu1127 piston 360--€
-Articlenumber tu1125 cam 210--€
We can give you an advice that the best for your Bike is when you use the standart setting.
We only do an engine modification with piston and cam on the SM610.
Greetings from Germany.
Mit freundlichen Grüßen
ZUPIN Moto-Sport GmbH
Benjamin Helmer