10
B. Engine Specifications
Dry Weight
2.5 kg –– 5 lbs., 10 ounces
Type of Engine
Air Cooled, Two stroke, Single-
Cylinder, Gasoline Engine
Rotation
Counterclockwise, viewed from TOP
Bore
32.2 mm (1.268 in.)
Stroke
26.0 mm (1.04 in. )
Spark Plug
NGK BPM7Y, Champion RCJ-7Y or
RCJ-8Y The spark plug gap is
0.65 mm (0.026”).
Refer to Owner’s Manual, for
service Procedure
Fuel
Premixed two stroke fuel
Fuel Oil Ratio
50:1 ratio with ECHO or
Mantis
oil
Gasoline
Unleaded, 89 octane or higher
Displacement
21.2 cc (1.294 cu. in.)
Exhaust System
Spark arrester muffler
Carburetor
ZAMA diaphragm model C1U type.
RPM at idle 2800
+
-
250 RPM
Ignition System
There are no adjustments required
for the ignition
Service
Problem
1. Blades don’t cut
cleanly.
2. Blades don’t
move when
throttle is
depressed.
3. Engine fails to
start
4. Engine hard to
start.
5. Engine misses.
6. Engine lacks
power.
7. Engine
overheats.
8. Engine noisy or
knocking.
9. Engine stalls
under load.
Cause
Blades are dull or not adjusted properly.
Engine is not seated properly on the gear
housing.
Blades are adjusted too tight.
ON/OFF switch is in OFF position.
No fuel in tank.
Fuel strainer clogged.
Fuel line clogged.
Spark plug shorted or fouled.
Spark plug is broken (cracked porcelain or
electrodes broken).
Ignition lead wire shorted, broken or
disconnected from spark plug.
Ignition inoperative (no spark from lead
wire).
Water in gasoline or stale fuel mixture.
Too much oil in fuel mixture.
Engine under or over choked.
Carburetor out of adjustment.
Gasket leaks (carburetor or
cylinder base gasket).
Weak spark at sparkplug
Air cleaner clogged.
Carburetor out of adjustment.
Muffler clogged.
Clogged exhaust ports.
Clogged spark arrestor
Poor compression.
Insufficient oil in fuel mixture.
Air flow obstructed.
Loose flywheel.
Spark plugs incorrect heat range.
Worn bearings, piston ring or cylinder walls.
Carburetor adjustment too “lean”.
Engine overheats.
Remedy
Have blades sharpened and adjusted.
Re-install engine following the assembly instructions. (pg. 7)
Re-adjust blades following service instructions. (pg. 11)
Move switch to ON.
Fill Tank.
Replace Strainer.
Clean fuel line.
Install new sparkplug.
Replace sparkplug.
Replace lead wire or attach to sparkplug.
Contact
Mantis
.
Drain entire system and refill with fresh fuel.
Drain and refill with correct mixture. If flooded by over
choking, proceed according to instructions in operation
section. If under choked, move choke lever to closed position
and crank two or three times. See “Carburetor Adjustment”
Replace gaskets. (pg. 12)
Contact
Mantis
.
Remove and clean. See “Carburetor Adjustment”. (pg. 10)
Clean or replace spark plug - set gap to 0.6-0.7 mm (.024
.028in.).
Contact
Mantis
.
Clean air cleaner.
See “Carburetor Adjustment”.
Clean carbon from muffler.
Remove muffler, rotate engine until the piston is at top of
cylinder. With a wooden scraper or blunt tool, remove all
carbon from exhaust ports. Be careful not to scratch or
damage piston or cylinder walls. Blow out all loose carbon
with compressed air. Install muffler and gasket.
Clean
Contact
Mantis
.
Mix fuel as described in starting instructions.
Clean flywheel, cylinder fins and screen.
Tighten flywheel nut.
Replace with plugs specified for engine.
Contact
Mantis
.
See “Carburetor Adjustment”.
Remove dust and dirt from between cylinder fins.
A. Troubleshooting
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