3
Add stabilizer to fuel in fuel tank or storage container.
Always follow mix ratio found on stabilizer container.
Run engine at least 10 minutes after adding stabilizer
to allow it to reach carburetor.
If gasohol has been used, complete preceding
instructions and then add a small amount, one
pint or less, of unleaded regular automotive gasoline
properly mixed with the specified lubricating oil
and run the engine until the fuel tank is empty
and the engine stops due to lack of fuel.
2. Pull starter handle slowly until resistance is felt
due to compression pressure, then stop. Release
starter tension slowly to prevent engine from
reversing due to compression pressure. This position
will close both the intake and exhaust ports to
prevent corrosion of the piston and the cylinder
bore.
3. Clean unit by removing any dirt from exterior of
the engine and equipment.
TUNE-UP PROCEDURE.
The following is a minor tune-
up procedure. Repair procedures for this engine and
its components are listed in this manual if the engine
does not perform to satisfaction after tune-up is
performed.
CAUTION:
Remove spark plug wire before doing
any service work on engine.
1. Service or replace air cleaner as necessary.
NOTE:
Snow King
®
engines do not use an air filter
due to the clean operating environment and to
prevent filter freeze-up.
2. Remove blower housing, clean all dirt, grass or
debris from air intake screen, cylinder cooling fins,
and carburetor governor levers and linkage.
3. Remove carburetor, clean and install a carburetor
kit, make adjustment presets where needed. Presets
are found in the carburetor section of this manual.
Make sure fuel tank, fuel filters and fuel lines are
clean. Reinstall carburetor, replacing any worn
or damaged governor springs or linkage. Make
proper governor adjustment. Adjustments are found
in the manual under governor linkage and
adjustment and engine reassembly.
4. Replace the spark plug with a correct equivalent.
5. Make sure all ignition wires are properly routed,
so they will not rub on flywheel. Inspect all ignition
wires for abrasion or damage. Remove flywheel
and check flywheel key, reinstall flywheel, torque
flywheel nut to specifications. Set air gap between
solid state module and flywheel at .0125'. Air gap
gauge, part no. 670297 may be used.
6. The engine must be firmly mounted to the associated
equipment. On rotary lawnmowers, make sure blade
is properly balanced and correctly torqued. See
disassembly section for flywheel removal and air
gap setting procedure.
7. Make sure all remote linkage is properly adjusted
for operation.
8. Fill tank with the proper fuel/oil mix.
9. Start the engine, allow it to warm up 5 minutes,
then adjust carburetor and engine R.P.M. according
to Tecumsehs recommendations.
Snow King
®
engines should be run in outdoor
temperatures for engine adjustments.
NOTE:
Emissionized engines have non-adjustable
carburetors in compliance with CARB (California Air
Resource Board) and U.S. EPA (United States
Environmental Protection Agency). These engines can
not be modified without specific authorization.
EXHAUST PORT CLEANING.
The exhaust ports should
be cleaned after each seventy-five (75) to one hundred
(100) hours of use.
Before cleaning the ports place the piston in the Bottom
Dead Center position. Then clean the ports using a
pointed 3/8' diameter wooden dowel or similar tool.
Be sure not to scratch the port area. Also remember
to remove all the loose carbon particles from the engine.
NOTE:
When cleaning the exhaust ports, check and
clean the compression release passage.
COMPRESSION
RELEASE
PASSAGE
Summary of Contents for AH520 -
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