Troubleshooting Guide - Shindaiwa B450 Owner's/Operator's Manual

Troubleshooting Guide

What To Check
Does the engine
crank?
YES
Good
compression?
YES
Does the tank
contain fresh
fuel of the
proper grade?
YES
Is fuel visible
and moving in
the return line
when priming?
YES
Is there spark at
the spark plug
wire terminal?
YES
Check the
spark plug.
Engine Does Not Start
Possible Cause
Faulty recoil starter.
NO
Fluid in the crankcase.
Internal damage.
Loose spark plug.
NO
Excess wear on
cylinder, piston, rings.
Fuel incorrect, stale, or
NO
contaminated; mixture
incorrect.
Check for clogged fuel
NO
filter and/or vent.
The ignition switch
NO
is in "O" (OFF) position.
Shorted ignition ground.
Faulty ignition unit.
If the plug is wet, excess
NO
fuel may be in the
cylinder.
The plug is fouled
or improperly gapped.
The plug is damaged
internally or of the
wrong size.
Remedy
Consult with an authorized
servicing dealer.
Tighten and re-test.
Consult with an authorized
servicing dealer.
Refill with clean fresh unleaded
gasoline with a pump octane of
87 or higher, mixed with
Premium 2-cycle mixing oil at a 50:1
gasoline/oil ratio.
Replace fuel filter or vent as required.
Restart.
Move switch to "I" (ON)
position and re-start.
Consult with an authorized
servicing dealer.
Crank the engine with the
plug removed, replace the
plug, and re-start.
Clean and re-gap the plug to
0.6 ~ 0.7 mm. Re-start.
Replace the plug with a
NGK BMR6A. Re-start.
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