here are the specs for my engine:
Specifications for Hua Sheng Motor
Model.......................142F-G-1
Type 4 -stroke .............OHV 1 cyl 4 -stroke
Eng. displacement...........49cc
Output Shaft Rotation.......CCW
Bore & Stroke ............41.8 x 35.8 mm
Max. Power ..............1.4 KW/ 6800 rpm
Max. Torque .............2.0 Nm / 4500 rpm
Max. rpm no load............7500rpm
Output Shaft size...........15.853 dia. x 33.5mm /15.875/ 5/8 inch
Fuel consumption............480g / Kw Hour
Engine Cooling..............forced air
Ignition....................TCI
Engine size:L x W x H.......400*320*355
Net wt. without tank........5.7kg
Engine PTO rotation.........CCW
Crankcase oil volume........0.25L
Eng. Compression ratio......7.4
Engine idle rpm.............1800±152
hope that helps you