TROUBLESHOOTING GUIDE
PROBLEM CAUSE SOLUTION
REPLACEMENT PARTS LIST
FS120-A Exhaust Pipe Set
FS120-B Valve Set
FS120-C Rocker Arm Set
FS120-D Pushrod Set
FS120-E Wrist Pin Set
FS120-F Choke Set
FS120-G Cam Gear Cover Set
FS120-H Thrust Washer Set
FS120-I Rotor Bolt Set
FS120101X Case
FS120102 Backplate
FS120103 Cylinder Head
FS120110 Rear Bearing
FS120111 Backplate Gasket
FS120112 Head Gasket Set
FS120204 Connecting Rod
FS120210 Crankshaft
FS120218 Woodruff Key
FS120231 Piston
FS120232 Sleeve
FS120236 Ring
FS120606 Muffler Assembly
FS120711 Rocker Cover
FS120714 Cam Gear
FS120801 Carburetor Assembly
FS120816 Carburetor Intake O-Ring
FS120831 Intake Pipe Gasket
FS120863 Carburetor Body
FS120873 Intake Pipe
12109 Cam Gear Bearing Set
12114 Pressure Nipple
12518 Cam Gear Cover Bolt Set
12819 Fuel Nipple Set
12832 Idle Stop Screw
12833 Detent Spring
12845 Needle Valve O-Ring
12861 Needle Valve
12860 Needle Valve/Housing Set
40123 Intake Pipe Bolt Set
400109 Front Bearing
50122 Rocker Cover Bolt Set
61122 Backplate Bolt Set
80123 Head Bolt Set
80228 Prop Nuts/Washer Set
80810 Idle Needle Set
80866 Throttle Arm
1) Engine does not start A) Failed glow plug A) Replace glow plug with a new one
B) Glow Starter not charged B) Fully charge glow starter
C) Engine not being turned over fast enough C) Use an electric starter
D) Old fuel D) Replace with new fuel
E) Engine flooded with too much fuel E) Remove glow plug and expel fuel from cylinder
2) Engine does not draw fuel A) Idle mixture screw set too lean A) Reset idle mixture to factory setting
B) High Speed Needle Valve fully closed B) Reset high speed needle valve to factory setting
C) Hole or crack in fuel lines C) Replace fuel lines
D) Defective fuel tank D) Replace fuel tank
3) Engine vibrates excessively A) Propeller out of balance A) Balance propeller
B) Spinner out of balance B) Balance Spinner
C) Engine or motor mount loose C) Check all mounting bolts and tighten securely
4) Engine does not transition A) Failed and/or wrong type glow plug A) Replace with new recommended glow plug
B) Old and/or wrong type fuel B) Replace with new recommended fuel
C) Idle mixture set too lean C) Set idle mixture richer
D) Idle mixture set too rich D) Set idle mixture leaner
E) Valves out of adjustment E) Readjust valves to correct gap
5) Throttle barrel does not A) Idle stop screw out of adjustment A) Turn idle stop screw counterclockwise until
close completely barrel closes completely
B) Idle mixture set too lean B) Reset idle mixture to factory setting
6) Engine Overheats A) Engine running too lean A) Richen high speed needle valve
B) Cowl too restrictive B) Open vents in cowling
C) Improper fuel used C) Use recommend fuel
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