NGP S421-C - Maintenance Schedule and Troubleshooting; Scheduled Maintenance Tasks; Engine Will Not Start Issues

12
MAINTENANCE SCHEDULE
REGULAR SERVICE
PERIOD
Before
Each
Use
First
Month
or
5 Hrs
Every 3
Months
or
25 Hrs
Every 6
Months
or
50 Hrs
Every
Year
or
100
Hrs
Every
Two
Years
or 250
Hrs
ITEM
Perform at every
indicated month or
operating hour interval,
whichever comes first.
Engine oil
Check
O
Replace
O
O
Air Filter
Check
O
Replace
O
Spark plug
Check-adjust
O
Replace
O
Fuel tank
and filter
Clean
O
Fuel tube
Check
Every 2 years (Replace if necessary)
Valve
clearance
Check-adjust
O
Combustion
chamber
Clean
After every 200 hours
TROUBLE SHOOTING
ENGINE WILL NOT START
Possible Cause
Correction
1. Check fuel.
Out of fuel.
Refuel
Bad fuel; engine stored without
treating or draining petrol, or
refueled with bad petrol.
Drain the fuel tank and carburetor
(p.12). Refuel with fresh petrol.
2. Remove and inspect spark
plug.
Spark plug faulty, fouled, or
improperly gapped.
Replace the spark plug(p.11).
Spark plug wet with fuel (flooded
engine).
Dry and reinstall spark plug.
3. Take engine to an authorized
servicing dealer.
Fuel filter clogged, carburetor
malfunction,ignition malfunction,
valves stuck, etc.
Replace or repair faulty components
as necessary.
4. Push the prime button
In cold condition
Push the prime button.