Specification:
- Displacement: 0.128 cu in (2.10 cc)
- Bore: 0.543 in (13.8 mm)
- Stroke: 0.551 in (14.0 mm)
- Practical R.P.M.(R.P.M.): 5,000-40,000
- Output: 1.65 ps @ 34,000 rpm
- Weight: 8.32 oz (236 g)
- Includes: RP6 plug, exhaust seal ring, dust caps

Even more power for the 12XZ!
•A new crankshaft featuring a counter-balancing shape and a more efficient intake port.
•The connecting rod is made of a new material, and the crankcase has been strengthened.
•Improvements have also been made to the liner ports, inner head and the 12F slide valve carb.
•A high-performance RP6 plug is included.