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TUNE-UP PROCEDURE
A “Tune-Up,” see the steps listed below, would normally be performed on relatively new engines brought in for
minor difficulties. By performing these steps you will either be sure that the engine is functioning properly or will
know what major repairs should be made. The steps are also covered in the Overhaul Procedure and will normally
be performed as a part of the complete overhaul.
1. Disconnect and ground spark plug wires.
2. Remove air cleaner cartridge, check for proper
servicing. Check gaskets, pre-cleaner and
cartridge for damage.
3. Check oil level. Drain oil. Remove oil filter.
4. Remove blower housing, inspect rewind
assembly when equipped.
5. Clean cooling fins and entire engine.
6. Check governor, linkage and springs for
damage and wear. Check governor adjustment.
7. Remove intake manifold and carburetor.
Disassemble carburetor. Wash in solvent and
inspect for wear or damage. Replace gaskets
and parts as necessary. Reinstall carburetor on
manifold. Set initial adjustment.
8. Replace spark plugs. Remove flywheel. Check
flywheel key. Check for oil seal leakage on both
flywheel and PTO sides.
9. Check coils. Inspect all wires for breaks and/or
damaged insulation. Be sure ground wires do not
touch flywheel. Check ground wire and stop
switch connections.
10. Remove cylinder heads. Remove carbon.
Check head gaskets. Inspect valves for seating.
11. Install cylinder heads and new gaskets. Tighten
to specified torque. Adjust valve clearance. Set
spark plug gaps.
12. Reinstall intake manifold using new gaskets.
13. Reinstall blower housing.
14. Install new oil filter. Replace oil and fuel.
15. Adjust equipment control and cables, if used, for
correct operation.
16. Service air cleaner pre-cleaner and cartridge, or
replace.
17. Check muffler for restrictions or damage.
18. Start engine and bring up to operating
temperature. Then, adjust carburetor mixture
and engine top speed.
OVERHAUL PROCEDURE
The following Overhaul Procedure is intended to help you to establish a systematic method of repairing Briggs
& Stratton OHV engines. These steps may be performed in a different order but best efficiency is obtained when
the repairs are performed in the same sequence every time. The exact procedure will vary according to the engine
model being repaired. Be careful to locate the instructions covering the specific model being repaired.
Disassemble
1. Drain oil. Remove oil filter.
2. Remove spark plugs.
3. Air cleaner assembly (if equipped).
Fuel tank and bracket assembly (if equipped).
Fuel pump and bracket (if equipped).
4. Rotating screen (if equipped). Blower housing.
5. Rewind starter (if equipped).
6. Exhaust manifold, muffler(s).
7. Intake manifold and carburetor.
8. Check throttle shaft and bushings for wear.
9. Disassemble carburetor.
10. Check armature air gap. Remove armatures.
11. Flywheel.
12. Electric starter.
13. Breather. Valve covers and valley cover.
14. Governor control bracket.
15. Check valve clearances.
16. Cylinder shields, rocker arms, push rods,
cylinder heads.
17. Valves, springs and seals. Inspect valve guides
and seats.
18. Check crankshaft end play. Remove burrs from
crankshaft extension.
19. Crankcase cover. Inspect bearings. Remove oil
seal.
20. Cam gear and tappets. Inspect governor.
21. Connecting rods and pistons.
22. Inspect crankshaft.