NO START v
ENGINE STARTS
 >> >> >>
v









Engine Runs Poorly



Inspect oil
Warped cylinder
Broken ring
Loose part
obstructing <topend
Bottom end     v 		<SEIZED

(Kickstart will not turn engine)
<
 Seized
<
Not Seized
>



Remote
Switches


Check fuel delivery system >




Loosen carburetor drain valve >
 No Fuel >
Fuel Present
v
v
v
v
v
v
 Tank valve
Fuel line
Cap vent
Seat valve
Vacuum hose
Trash in carburetor

 <






>
Wire mesh air filter>

v
       v
      High <   Speed
      v
      v
      v
 v
        v
 Lodged metal thread
<

Check crankcase
Check for spark  v < <                        < <      <

       v
Exhaust
 < High Compression
Valve clearence
Timing
   v
 Dry Plug
<
Wet
Plug
 v		 <Spark Present

No Spark>
 Ignition coil
CDI
Magneto
Switch
Check spark
 AIR
CARBURETOR
<Magneto Pickup 		<


>
 <


>
 <


>
     <  v

Low Speed >


 		Check
Intake gaskets
Bowl screws
Vacuum
line
Ignition switch  v

    v  >>        >> ^   > Seat valve
Plug gap



AIR Cut-off
diaphram
spring
Blocked passage

    v >> >> >> v EXCESSIVE NOISE > 
   v







      >> >> HEAD
 Incorrect valve setting (gap) > Adjust valves> Check adjusting screw for wear








Worn cam> Replace cam








Worn rockerarm> Replace rockerarm







CYLINDER
 Cylinder wall worn









Piston worn









Piston rings worn, weak, broken









Piston pin, connecting rod, worn









Cam chain tension lever worn









Cam sprocket worn
































































































































































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