Shindaiwa EB630 Owner's/Operator's Manual page 13

Troubleshooting Guide (continued)
What To Check
Is the engine overheating?
Engine is rough at all speeds.
May also have black smoke and/
or unburned fuel at the exhaust.
Engine is knocking.
LOW POWER OUTPUT
Possible Cause
Operator is overworking the unit.
Carburetor mixture is too lean.
Improper fuel ratio.
Fallen leaves or debris on intake cover.
Fan, fan cover, cylinder fins dirty or damaged.
Carbon deposits on the piston or in the muffler.
Clogged air cleaner element.
Loose or damaged spark plug.
Air leakage or clogged fuel line.
Water in the fuel.
Piston seizure.
Faulty carburetor and/or diaphragm.
Overheating condition.
Improper fuel.
Carbon deposits in the combustion chamber.
Remedy
Use a lower throttle setting.
Consult with an authorized servicing dealer.
Refill with clean fresh unleaded gasoline with a
pump octane of 87 or higher, mixed with Premium
-cycle mixing oil at a 50:1 gasoline/oil ratio.
Clean the intake cover.
Clean, repair or replace as necessary.
Consult with an authorized servicing dealer.
Clean or replace the air filter.
Tighten or replace the plug with a
Champion RCJ6Y or equivalent type spark plug
of the correct heat range.
Repair or replace fuel filter and/or fuel line.
Refill with fresh fuel/oil mixture.
Consult with an authorized
servicing dealer.
See above.
Check fuel octane rating; check for presence of
alcohol in the fuel . Refuel as necessary.
Consult with an authorized servicing dealer.
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