International Harvester Company Cub Lo-Boy C-60 Service Manual page 65

Missing and Backfiring But Fails to Start
Wateringasoline .
1.
Drain fuel tank, fuel bowl and carburetor.
Refill with clean gasoline.
Tighten manifold stud nuts. Replace
gasket if necessary.
2. Air leaks around intake manifold.
3.
Improper firing order.
Check spark plug cables for correct in-
stallation at spark plugs and distributor
cap.
4. Distributor not correctly timed to
engine.
Check and adjust timing. Refer to "Tune-
Up", page 1-69.
Remove
cap and rotor and dry thoroughly. 5. Moisture in the distributor
Check for loose contact terminals or dirt
in cracked cap.
6. Distributor cap shorting out.
Missing or Cutting Out at High Speed
1. Distributor breaker plate not grounded
properly. Check ground lead wire and screws.
2.
Primary lead not tightened or
partially broken.
Check prima~lead wire and screws.
Adjust point spring tension or replace
points.
3. Weak point spring tension.
Check plug gap. Refer to "Tune-Up",
page 1-69 for correct gap. Replace
plugs if necessary.
4.
Spark plugs faulty
U
II
"Tune- p ,
Readjust point gap. Refer to
page 1-69.
5. Point gap incorrect.
6. Low voltage to spark plugs caused
by defective coil.
Replace
coil.
7.
Carburetor
Float level set too low.
Check float level. Reset if necessary.
Clean out main jet. Replace if necessary.
(a)
(b)
(c)
Dirt in main jet.
Clean out fuel inlet filter in carburetor. Restriction in filter.
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