Shindaiwa HT254EF - Manual (Page 16)

16
Carburetor Adjustment
Engine Break-In
New engines must be operated a minimum duration of two tanks of fuel break-in before carburetor adjustments can be
made. During the break-in period your engine performance will increase and exhaust emissions will stabilize. Idle speed can
be adjusted as required.
High Altitude Operation
This engine has been factory adjusted to maintain satisfactory starting, emission, and durability performance up to
1,100 feet above sea level (ASL) (96.0 kPa). To maintain proper engine operation and emission compliance above
1,100 feet ASL the carburetor may need to be adjusted by an authorized Shindaiwa service dealer.
NOTE:
Every unit is run at the factory and the carburetor is set in compliance with emission regulations. Carburetor adjustments,
other than idle speed, must be performed by an authorized Shindaiwa dealer.
IMPORTANT!
If the engine is adjusted for operation above 1,100 feet ASL, the carburetor must be re-adjusted when operating the
engine below 1,100 feet ASL, otherwise severe engine damage may result.
Spark Arrester Screen Maintenance
If the engine becomes sluggish and low
on power, check and clean the spark ar-
rester screen.
WARNING!
Never operate the unit with a
damaged or missing muffler or
spark arrester! Operating with a
missing or damaged spark arrester
is a fire hazard and could also dam-
age your hearing.
With a 4 mm hex wrench remove 1.
the 3 engine cover screws and the
engine cover. See Figure 26.
With a 4 mm hex wrench remove the
2.
3 muffler bolts and the muffler.
See Figure 26.
With a small screwdriver remove the
3.
2 screws holding the spark arrester
screen and cover to the muffler. See
Figure 26.
Remove the screen and clean it with
4.
a stiff bristle brush.
Inspect the cylinder exhaust port for
5.
any carbon buildup.
IMPORTANT!
If you note excessive carbon buildup,
consult with an authorized Shindaiwa
servicing dealer.
Reassemble the spark arrester, muf- 6.
fler and engine cover in the reverse
order of disassembly.
Figure 26
Muffler
Bolts
Spark Arrester
Screen
Cover
Cover
Screws
Muffler
Gasket
Engine Cover
Screws
Muffler
Spark Arrester
Cover