11
PART 5
10
PART 4
4.5 Clean the fuel tank and filter strainer after every 100 hours running.
Open the fuel tank cap,take out the fillter strainer and clean it with
brush. Take off the fuel tank clean internal surface, remove dirt and
water attached. Reinstall the fuel tank and the filler strainer, fill in
fresh fuel oil till the oil level reaches the red scale line. (Refer to 2.0
of Part 2)
4.6 Check the aging condition of the oil tube after every 2 years use.
Replace oil tube if there is any aging hardening or crack. Tighten
the new oil tube joints and prevent any leakage.
4.8
Important torgue torue(N.m)
152/154/156
170/170B/170C
4.7 Should the engine be stored for a long peiod, please do as follows:
First,take off the fuel tank,drain out all the fuel oil and clear away the
dirt/water attached on the surface of internal tank. Open the fuel
cock,unscrew the drain plug at the bottom of carburetor and drain out
fuel oil in carburetor completely Then tighten the drain plug.
Second, unscrew the drain plug at the bottom of the crankcase and
drain out the lube oil in the crankcase completely. Then tighten the
drain plug.
Finally, clean the outer surface of the engine with clean cotton and
remove dirt or dust. Then put the engine at a dry place.
model
24
Crankcase cover
bolts
12
50
The connecting
rod bolts
Fly wheel bolts
168
24
12
80
24
12
80
177
24
14
113
24
14
113
5.1 Low power output
TROUBLESHOOTING
Symptom
Cause Analysis
Troubleshooting
When
turning
throttle
greater,
rising of
speed
responds
slowly or
speed is
decreased or
engine stops
running.
Ignition system
Fuel supply system
Poor compression
Incorrect ignition time
Air in fuel line or fuel line clogged
Main jet is not adjust properly
Metering jet and main jet
clogged in carburetor
Fuel cock is clogged up
Too much carbon fouling
in combusting chamber
Too much carbon fouling
in muffler and exhaust pipe
Air cleaner is clogged up
Intake pipe is leaking
Piston or cylinder or piston ring
is worn
Air leakage from the surface by
which cylinder block contacting
with cylinder head.
Too big or too small valve clearance
Valve tightness is poor
Readjust ignition advance angle
Expel air or dredge fuel line
Readjust
Clean and blow to get through
Clean and replace damaged part
Clear away
Clear away
Clean air cleaner element
Repair or replace
Replace the worn
Replace cylinder gasket
Readjust
Repair
24
C ylinder head
bolts
24
24
34
34
4.9 tuneup specifications
Item
specification
Spark plug gap
0.6~0.7mm
(0.024~0.028in)
IN:0.1 0.15mm
EX:0.15 0.2mm
No other adjustments needed
Valve clearance(cold)
other specification
188/190/192
Useful data
