Table 2. Carburetor Malfunction Check Points - Tecumseh VLV Technician's Handbook

Trouble
Engine will not start
Engine will not accelerate
Engine hunts (at idle or high speed)
Engine will not idle
Engine lacks power at high speed
Carburetor floods
Carburetor leaks
Engine overspeeds
Idle speed is excessive
Engine starves for fuel at high speed (leans out)
Carburetor runs rich
Performance unsatisfactory after being serviced.
1. Open fuel-shut off valve at fuel tank—Fill tank with
fuel.
2. Check ignition, spark plug.
3. Clean air cleaner—Service as required.
4. Dirt or restriction in fuel system—Clean tank and
fuel strainers, check for kinks or sharp bends.
5. Check for stale fuel or water in fuel - - Fill with fresh
fuel.
6. Examine fuel line and pick-up for sealing at fittings.
7. Check and clean atmospheric vent holes in
carburetor and air cleaner body.
8. Examine throttle for binding or excessive play- -
Remove all dirt or paint, replace shaft.
9. Examine throttle return spring for operation.
10. Check for bent throttle plate.
11. Adjust control cable or linkage, to assure
carburetor control.
12. Clean carburetor after removing all nonmetallic
parts that are serviceable. Trace all passages.
13-5

Table 2. Carburetor Malfunction Check Points

Corrections
1, 2, 3, 4, 5, 6, 8, 14, 15, 17, 18, 19
2, 3, 17
3, 4, 8, 9, 14, 20, 21, 22
4, 8, 9, 14, 20, 21, 22
2, 3, 6, 8, 17
4, 7, 16, 18
6, 7, 18
8, 9, 14, 15
8, 9, 14, 15
1, 3, 4, 6, 15, 16, 17
7, 16, 18
1, 2, 3, 4, 5, 6, 7, 8, 9, 15, 16, 17
13. Check inlet needle and seat for condition and
proper installation.
14. Check sealing of welch plugs, and gaskets.
15. Adjust governor linkage.
16. Check float shaft for wear and float for leaks or
dents.
17. Check flywheel key for damage.
18. Shrunken primer bulb causing siphon affect.
19. Check for warp air filter box causing prime charge
loss.
20. Air leak at idle welch plug, reseal with nail polish.
21. Air leak at intake cross over pipe, check using
spray carburetor cleaner.
22. Air leak between the carburetor body and bowl.
Replace bowl assembly.
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