Active 50
From Scooter Wiki
The Active 50 is a 51.7cc 2-stroke engine produced by Active, an Italian engine manufacturing company. It is legendary as a big bore scooter engine because of its performance and reliability.
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[edit] Technical Specifications
- Displacement: 65.9cc
- Reed: no
- Carburetor: Walbro WYK-60a
- Stock Carb Settings: 1.5 turns high, 1 turn low
- Oil Mixture: 60:1 (synthetic)
- Horsepower: 4.5hp
- Net Power: 3.4kW
- Rotation (output side): counter-clockwise
- Clutch Diameter: 78mm
- Ignition System: TCI
- Idle RPM: ??
- Max RPM: 11,000 RPM
- EPA Compliant: no
- C.A.R.B. Compliant: no
- Fuel Type: Unleaded 92+
[edit] Performance
The Active 50 is a high performance, high reliability engine. It features a precision ground, steel plated cylinder, a light weight piston and a large (relative to other scooter engines) 51.7cc displacement.
[edit] Availability
There are currently no distributors of this engine in the United States, but parts are available. Since this engine is relatively exotic, the cost of replacement parts is high.
[edit] Performance Enhancements
[edit] Tuned pipes
Puzey Power Pipe. The Puzey Power Pipe was designed specifically for use with this engine on the Evo 2x, Evo 2 or Evo SPX scooters. Because of this, no modifications should be necessary to adapt it. On the Active 50, the Puzey Power Pipe will cause a significant increase in low-mid range power, but will not increase RPMs noticeably.
Puzey Race Pipe.
ADA GSR40 Pipe.
[edit] Porting
Porting is somewhere this engine really shines. This engine is no toy to begin with, but porting can squeeze quite a bit more out of it. With a skilled hand, ported Active 50s have lived long lives pushing stand up scooters to the 50s.
