i got this from a UK based onlline shop

"...this high perormance engine produces the same power as its rivals but at 8000rpm less, this result in amazing levels of torque capable of slipping a 3 shoe centex clutch!..."


Constuction: ABC
Carb: Aluminum
Head Size: Low profile
Head Colour: Gold
Capacity: 4.38cc
Ports: 7
Stroke: 16.5mm
Bore:16.4mm
Crank: 14mm SG
RPM: 37,000
HP: 2.5
Weight: 340g


Specs look good