AW: Replacement malossi piston grade ? ??

Schaltroller / Classic Motoscooters Vespa Wideframe
1

Hi,

 

ABCD .means the grinding size of the cylinder in 1/100mill steps

 

You find a stamped letter on the old Piston Top and on the cylinder feet gasket sealing surface.

 

if you have an very old cylinder you can use a "B" in a "A".

 

 

The right timing for this cylinder is 17 degrees BTDC. --- timing light checked!

 

regards

2

Are the pistons larger A B C D eg B is a larger piston than A by 1/100mm