50GX
EVO30050101 Crankcase
EVO30050202 Front Bearing
EVO30040203 Rear Bearing
EVO30050204 Packing
EVO30050206
Crankshaft Retaining Ring
EVO30050301 Rear Cover
EVO30010302 Rear Cover Screw Set
EVO30050303 Rear Cover O-Ring
EVO30940304 Pressure Nozzle
EVO30940305 Pressure Nozzle Gasket
EVO30050401 Cylinder
EVO30040402 Cylinder Screw Set
EVO30010403 Cylinder Nut
EVO30050404 Cylinder Gasket
EVO30010405 Exhaust Screw Set
EVO30010406 Exhaust Nut
EVO30040407 Exhaust Flange Gasket
EVO30050701 Piston
EVO30050702 Piston Ring
EVO30050801 Piston Pin
EVO30050802 Piston Pin Retainer
EVO30050951 Connecting Rod
EVO30010904 Connecting Rod Washer
EVO30051001 Crankshaft
EVO30050102 Crankcase Screw Set
EVO30051101 Prop Drive Washer 50GX
EVO30041102 Drive Washer Key
EVO30011103 Propeller Nut
EVO30041104 Propeller Washer
EVO30011105 Propeller Screw
EVO30041107 Propeller Screw Set
EVO30041109 Propeller Nut Washer
EVO30010306 Carburetor Flange
EVO30010307 Carburetor Flange Gasket
EVO30040308 Carburetor Flange Screw Set
EVO30011301 Reed Valve Case
EVO30011302 Reed Valve
EVO30011303 Reed Valve Screws
EVO30011304 Reed Valve Gasket (Upper)
EVO30011305 Reed Valve Gasket (Bottom)
EVO30011306 Reed Valve Strap
EVO30041307 Carburetor Screws
EVO3314LB Electronic Ignition Unit Type 2
EVO30013309 Spark Plug (Sm Cap)
EVO30941405 Ignition Sensing Fixing Screws
EVO3224X Carburetor
Part # Description Part # Description Part # Description
If the engine does not start
- check and use a new spark plug if needed.
(Check the spark: Put the plug into the cable end and by turning
the engine you’ll see the necessary spark. Note: The plug must
touch a metal part of the engine.)
- check fuel lines.
- check for proper mechanical function by turning the
engine over.
- check that the carburetor is correctly installed.
- remove the carburetor cover from the feed side; check
the filter and blow off the carburetor with compressed air
( CAUTION: When using compressed air, use eye protection.);
when re-assembling be careful to maintain the proper order of
the components.
- check the vacuum feed line.
Mechanical Faults
If the engine cannot be turned over easily
- a likely cause is the piston in the cylinder is seized: loosen
and unscrew the cylinder bolts.
- carefully remove the cylinder.
- visually examine the piston and crankcase to find the likely cause
of the engine’s mechanical problem.
Note: Mechanical repairs must always be completed by a professional
service department.
Troubleshooting Guide
Engine Specifications
50GX Evolution Engine Dimensions
Bore
Stroke
Displacement
Weight without ignition*
Weight of ignition unit
40mm
38mm
50cc / 3.0 cu in
1530 g / 53.0 oz
190 g / 6.7 oz
RPM range
Fuel
Lubrication/Break-in
Lubrication/Standard
1000–7500 rpm
Unleaded 91-octane
Oil with gasoline
in mixture 1:30
Oil with gasoline
in mixture 1:40
* The value in the table above stands for the weight of a completely assembled engine, including the spark plug, carburetor, drive washer
and prop screws.
A B C D E
mm mm mm mm mm
143 122 70 78 78
F G H I J
mm mm mm mm mm
6.6 M10x1 55 26 181
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