OS Max 105HZ-R with Powerboost Pipe 105 Combo

OS Max 105HZ-R with Powerboost 105 Pipe Combo
Specifications:

Displacement: 1.048 cu in (17.17 cc)
Bore: 1.442 in (29 mm)
Stroke: 1.024 in (26 mm)
Practical rpm: 2,000-16,500
Output: 3.8 hp @ 15,000 rpm
Weight: 21.03 oz (596 g)