See the Prima 3
This set is designed for Vespa Vintage Large Frame and P-Series models:
Engine Family Compatible Models Genuine Scooter Co
Keep your 139QMB engine running smoothly with this OEM two-valve rocker arm assembly from Blue Line Designed specifically for Type 1 engines with 64mm valve stems and a shorter cylinder head
Malossi, Piston (57.9mm, 1st Oversize); VMA filly See the Prima 3First oversize replacement piston for the MCK3 cylinder kit for Primavera. Comes with wrist pin, circlips, and rings. Piston kits for your 135, 166, and 210 Malossi cylinder kits. Replacement kit comes with piston, rings, pin, and circlips. Please specify which cylinder kit you have and whether you need on size or oversize when ordering. Also, on some of the 210 kits, pistons can be sized by a letter i. e. A, B, C, etc This should be visible on your