Tecumseh HSK840, Technician'S Handbook

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14. Check position of choke and throttle plates.
15. Adjust control cable or linkage to assure full choke
and carburetor control.
16. Clean carburetor after removing all non-metallic
parts that are serviceable. Trace all passages.
17. Check inlet needle and seat for condition and proper
installation.
18. Check sealing of welch plugs, cups, plugs and
gaskets.
19. Adjust governor linkage.
20. Adjust float setting.
21. Check float shaft for wear and float for leaks or
dents.
22. Check seal for fuel drain or bowl gasket.
23. Is carburetor operating at excessive angle?
TROUBLESHOOTING CARBURETION SERIES I
TROUBLE CORRECTIONS
Carburetor out of adjustment ................................. 3, 4, 11, 12, 13, 15, 19
Engine will not start ................................................ 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 14, 15, 16, 17, 19, 20, 23
Engine will not accelerate ...................................... 2, 3, 4, 5, 11, 12, 15, 19, 23
Engine hunts (at idle or high speed) ...................... 3, 4, 8, 9, 10, 11, 12, 14, 19, 20, 23
Engine will not idle ................................................. 3, 4, 8, 9, 10, 11, 12, 13, 14, 18, 19, 20, 23
Engine lacks power at high speed ......................... 2, 3, 4, 7, 8, 10, 11, 12, 15, 18, 19, 20, 23
Carburetor floods ................................................... 4, 7, 17, 20, 21
Carburetor leaks..................................................... 4, 6, 7, 10, 17, 18, 22, 23
Engine overspeeds ................................................ 8, 9, 13, 14, 15, 18, 19
Idle speed is excessive .......................................... 8, 9, 13, 14, 15, 18, 19
Choke does not open fully ..................................... 8, 9, 14, 15
Engine starves for fuel at high speed (leans out).. 1, 3, 4, 5, 6, 10, 11, 15, 16, 17, 18, 20
Carburetor runs rich with main adjustment ........... 7, 11, 17, 18, 20
needle shut off
Performance unsatisfactory after being serviced .. ALL
1. Open fuel shut off valve at fuel tank fill tank with
fuel.
2. Check ignition, spark plug and compression.
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/oil mixture of correct ratio.
6. Examine fuel line and pick-up for sealing at fittings.
7. Check and clean atmospheric vent holes.
8. Examine throttle and choke shafts for binding or
excessive play remove all dirt or paint, replace shaft.
9. Examine throttle and choke return springs for
operation.
10. Examine idle and main mixture adjustment screws
and “O” rings for cracks or damage.
11. Adjust main mixture adjustment screw. Check to see
that it is the correct screw.
12. Adjust idle mixture adjustment screw. Check to see
that it is the correct screw.
13. Adjust idle speed screw.
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