| 1. |
Engine does not start or starts poorly |
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Cause |
Remedy |
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Fuel tank empty |
Fill tank |
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Fuel petcock closed |
Open petcock |
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Throttle grip turned on too far when engine is cold |
Close throttle grip |
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Air filter clogged |
Clean air filter cartridge or replace it |
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Leaking or clogged fuel line |
Stop leak in line or blow it out |
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Defective float needle |
Replace needle valve |
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Clogged idling jet |
Clean jet |
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Contaminated breaker points |
Clean points |
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Loose or defective ignition cable |
Check cable; replace af necessary |
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Wet spark plugs due to condensation or too much fuel |
Clean spark plugs |
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Breaker contact gap or spark plug electrode incorrect |
Correct gap |
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Sticky valve |
Remove possible |
should be performed |
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carbon deposits |
by an autorized |
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from valve |
BMW dealer |
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Dead battery |
Have battery charged in service station. |
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Caution! Charge battery only with + and - cables removed. |
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| 2. |
Engine starts, but idles irregularly |
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Carburetor set too rich or too lean |
Readjust carburetor |
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Valve clearance insufficient |
Readjust valve clearance |
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Leaky valve |
Have valves ground |
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Leak between cylinder and head gasket or carburetor |
Check cylinder and |
should be performed |
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carburetor connections |
by an authorized |
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for leaks |
BMW dealer |
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Low compression |
Have valves ground |
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Check piston rings |
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or rebove cylinders |
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| 3. |
Hot engine idles irregularly Exhaust smokes |
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Float needle valve leaks, idle mixture set too rich |
Repair valve; readjust idle mixture |
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| 4. |
Engine runs irregularly, stalls Occasionally |
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Spark plug electrode gap too wide |
Readjust electrode gap |
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Oily or sooty spark plug |
Clean or replace spark plugs |
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Cause |
Remedy |
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Ignition cable wet or defective |
Dry or replace cable |
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Spark plug cap shorted |
Dry or replace plug cap |
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(recognizable by sooty burned spots) |
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Defective ignition system |
Replace defective parts |
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Clogged carburetor jets |
Clean jets |
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Clogged fuel line |
Clean the fuel line |
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Condensed water in float bowl |
Clean float bowl |
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| 5. |
Engine runs excessively hot, keeps running after ignition |
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is turned off |
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Fuel mixture too lean |
Check and readjust carburetor, check jet selection |
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Timing off |
Check and readjust ignition |
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Breaker contact gap off |
Check and readjust points |
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Dirty engine cooling fins |
Clean cooling fins |
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Spark plug heat value too low |
Use specified spark plugs |
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| 6. |
Engine pinks under load |
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Fuel octane rating too low |
Use name-brand fuel |
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Heavy oil carbon residues in combustion chamber |
Clean pistons, for which cylinder head must be removed, |
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see your BMW dealer |
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Timing too far advanced |
Correct timing |
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| 7. |
Starter does not work |
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Isolation of the gliding ring |
Press down kick-starter |
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caused by cold wheather |
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