Zenoah Welder GZ50N User Manual

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848H7H93A0 804  
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OWNER’S MANUAL  
ENGINE  
GZ50N  
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GZ50N  
2. Specifications  
Model  
Type  
GZ50N  
Air-cooled 2-stroke engine  
50.6 cm3  
Displacement  
G
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Max. output  
2.4 / 9000 kW/rpm  
2800 ± 200 rpm  
Mixture (Gasoline 50 : Oil 1)  
Walbro Diaphragm type  
NGK CMR7H  
Idle speed  
Fuel  
Carburetor  
Spark plug  
Overall size L x W x H  
Dry weight  
206 x 270 x 256 mm  
4.2 kg  
Fuel tank capacity  
0.80 L  
Specifications are subject to change without notice.  
3. Symbols on the machine  
For safe operation and maintenance, symbols are carved  
in relief on the machine. According to these indications,  
please be careful not to make a mistake.  
EMISSION CONTROL  
An emission control label is located on the engine.  
The port to refuel the “MIX GASOLINE”  
IMPORTANT ENGINE INFORMATION  
THIS ENGINE CONFORMS TO U.S. EPA PH1  
REGULATIONS FOR SMALL OFF-ROAD ENGINES.  
ENGINE FAMILY : 8HQZS.0515BS ; EM*1  
ENGINE DISPLACEMENT : 51cc  
Position: FUEL TANK CAP  
REFER TO OWNER’S MANUAL FOR MAINTE-  
NANCE, SPECIFICATIONS AND ADJUSTMENTS.  
MANUFACTURED:  
The direction to close the choke  
Position: AIR CLEANER COVER  
USE JASO FD OR ISO L-EGD GRADE 50:1 OIL.  
*1 : The initial number will be changed every year of  
manufacturing.  
The direction to open the choke  
Position: AIR CLEANER COVER  
GB-3  
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4. Fuel  
FUEL  
4. Pour in the rest of gasoline and agitate again for at least one  
minute. As some oils may be difficult to agitate depending  
on oil ingredients, sufficient agitation is necessary for the  
engine to last long. Be careful that, if the agitation is insuffi-  
cient, there is an increased danger of early piston seizing  
due to abnormally lean mixture.  
5. Put a clear indication on the outside of the container to avoid  
mixing up with gasoline or other containers.  
6. Indicate the contents on outside of container for easy identi-  
fication.  
Gasoline is very flammable. Avoid smoking or bringing  
any flame or sparks near fuel. Make sure to stop the en-  
gine and allow it cool before refueling the unit. Select  
outdoor bare ground for fueling and move at least 3 m  
(10 ft) away from the fueling point before starting the  
engine.  
FUELING THE UNIT  
1. Untwist and remove the fuel cap. Rest the cap on a dustless  
place.  
2. Put fuel into the fuel tank to 80% of the full capacity.  
3. Fasten the fuel cap securely and wipe up any fuel spillage  
around the unit.  
• The Zenoah engines are lubricated by oil specially formu-  
lated for air-cooled 2-cycle gasoline engine use. If Zenoah  
oil is not available, use an anti-oxidant added quality oil ex-  
pressly labeled for air-cooled 2-cycle engine use (JASO FC  
GRADE OIL or ISO EGC GRADE).  
• Do not use BIA or TCW (2-stroke water-cooling type) mixed  
oil.  
1. Select bare ground for fueling.  
2. Move at least 10 feet (3 meters) away from the fueling point  
before starting the engine.  
3. Stop the engine before refueling the unit. At that time, be  
sure to sufficiently agitate the mixed gasoline in the container.  
FORYOUR ENGINE LIFE, AVOID:  
1. FUEL WITH NO OIL (RAW GASOLINE) – It will cause severe  
damage to the internal engine parts very quickly.  
2. GASOHOL – It can cause deterioration of rubber and/or plas-  
tic parts and disruption of engine lubrication.  
3. OIL FOR 4-CYCLE ENGINE USE – It can cause spark plug  
fouling, exhaust port blocking, or piston ring sticking.  
4. Mixed fuels which have been left unused for a period of  
one month or more may clog the carburetor and result in  
the engine failing to operate properly.  
5. In the case of storing the product for a long period of time,  
clean the fuel tank after rendering it empty. Next, activate the  
engine and empty the carburetor of the composite fuel.  
6. In the case of scrapping the used mixed oil container, scrap  
it only at an authorized repository site.  
MIXING RATIO GASOLINE 50 : OIL 1  
Exhaust emission are controlled by the fundamental en-  
gine parameters and components (eq., carburation, igni-  
tion timing and port timing) without addition of any ma-  
jor hardware or the introduction of an inert material dur-  
ing combustion.  
• These engines are certified to operate on unleaded gaso-  
line.  
• Make sure to use gasoline with a minimum octane number of  
89RON (USA/Canada: 87AL).  
• If you use a gasoline of a lower octane value than prescribed,  
there is a danger that the engine temperature may rise and  
an engine problem such as piston seizing may consequently  
occur.  
• Unleaded gasoline is recommended to reduce the contami-  
nation of the air for the sake of your health and the environ-  
ment.  
• As for details of quality assurance, read the description in  
the section Limited Warranty carefully. Moreover, normal wear  
and change in product with no functional influence are not  
covered by the warranty. Also, be careful that, if the usage in  
the instruction manual is not observed as to the mixed gaso-  
line, etc. described therein, it may not be covered by the  
warranty.  
• Poor quality gasolines or oils may damage sealing rings, fuel  
lines or fuel tank of the engine.  
HOW TO MIX FUEL  
• Pay attention to agitation.  
1. Measure out the quantities of gasoline and oil to be mixed.  
2. Put some of the gasoline into a clean, approved fuel con-  
tainer.  
3. Pour in all of the oil and agitate well.  
GB-4  
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5. Operation  
STARTING ENGINE  
STOPPING ENGINE  
1. Feed fuel into the fuel tank and tighten the cap securely.  
2. Push the primer pump several times until overflown fuel flows  
out in the clear tube.  
1. Release the throttle lever and run the engine for half a  
minute.  
2. Shift the ignition switch to the STOP position.  
G
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IMPORTANT  
Except for an emergency, avoid stopping the engine while  
pulling the throttle lever.  
ADJUSTING THROTTLE CABLE  
3. Move the choke lever to the closed position.  
The normal play is 1 or 2 mm when measured at the carbu-  
retor side end. Readjust with the cable adjuster as required.  
(1)  
(3)  
(1) choke lever  
(2) close  
(3) open  
(2)  
1~2mm  
(1) Cable adjuster  
(2) Lock nut  
(3) Lock screw  
(0.04 in.)  
(3)  
(1)  
(2)  
4. Set the ignition switch to the “RUN” position.  
Place the unit on a flat, firm place.  
ADJUSTING IDLING SPEED  
5. While holding the unit firmly, pull out the starter rope quickly  
until engine fires.  
(1)  
IMPORTANT  
Avoid pulling the rope to its end or returning it by releasing  
the knob. Such actions can cause starter failures.  
(1) Idle adjusting screw  
(cross screw)  
6. Move the choke lever downward to open the choke. And  
restart engine.  
7. Allow the engine to warm up for a several minutes before  
starting operation.  
1. When the engine tends to stop frequently at idling mode,  
turn the adjusting screw clockwise.  
NOTE  
2. When the clutch keeps engaging at idling mode, turn the  
adjusting screw counter-clockwise.  
1. When restarting the engine immediately after stopping it,  
leave the choke open.  
2. Overchoking can make the engine hard to start due to ex-  
cess fuel. When the engine failed to start after several at-  
tempts, open the choke and repeat pulling the rope, or re-  
move the spark plug and dry it.  
NOTE  
Warm up the engine before adjusting the idling speed.  
GB-5  
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6. Maintenance  
Every Every Every  
25 50 100  
Before hours hours hours  
use after after after  
System/components  
Procedur  
Note  
fuel leaks, fuel spillage  
fuel tank, air filter, fuel filter  
wipe out  
inspect/clean  
replace, if necessary  
idle adjusting screw  
see adjusting  
idling speed  
replace carburetor  
if necessary  
spark plug  
clean and readjust  
plug gap  
GAP: .025 in (0.6 ~ 0.7 mm)  
replace, if necessary  
cylinder fins, intake air cooling vent clean  
muffler, spark arrester, cylinder  
clean  
exhaust port  
SPARK PLUG  
WARNING  
• Starting failure and misfiring are often caused by a  
fouled spark plug. Clean the spark plug and check  
that the plug gap is in the correct range. For a re-  
placement plug, use the correct type specified by  
ZENOAH.  
Make sure that the engine has stopped and is cool  
before performing any service to the machine.  
Contact with moving cutting head or hot muffler  
may result in a personal injury.  
AIR FILTER  
• The air filter, if clogged, will reduce the engine  
performance.  
• Filter element : Check and clean the filter element in  
warm, soapy water as required. Dry completely before  
installing.  
0.6~0.7mm  
(0.024~0.027in.)  
• Paper element : Check and clean the paper element  
by air blow as required.  
• If the element is broken or shrunk, replace with a new  
one.  
REPLACEMENT PLUG IS A NGK CMR7H.  
IMPORTANT  
(2)  
(1)  
Note that using any spark plug other than those des-  
ignated may result in the engine failing to operate prop-  
erly or in the engine becoming overheated and dam-  
aged.  
To install the spark plug, first turn the plug until it is  
finger tight, then tighten it a quarter turn more with a  
socket wrench.  
(1) Filter element  
(2) Paper element  
FUEL FILTER  
• When the engine runs short of fuel supply, check the  
fuel cap and the fuel filter for blockage.  
9.8 ~ 11.8 N.m.  
TIGHTENING TORQUE:  
(87 ~ 104 in-lbs)  
(1)  
(1) Fuel filter  
GB-6  
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6. Maintenance  
MUFFLER  
IMPORTANT  
WARNING  
If waste gets stuck and causes blockage around the  
intake air cooling vent or between the cylinder fins, it  
may cause the engine to overheat, and that in turn  
may cause mechanical failure on the part of the en-  
gine.  
Inspect periodically, the muffler for loose fasten-  
ers, any damage or corrosion. If any sign of ex-  
haust leakage is found, stop using the machine  
and have it repaired immediately.  
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Note that failing to do so may result in the engine  
catching on fire.  
(1)  
INTAKE AIR COOLING VENT  
WARNING  
(1) Cylinder  
Never touch the cylinder, muffler, or spark plugs  
with your bare hands immediately after stopping  
the engine. The engine can become very hot when  
in operation, and doing so could result in severe  
burns.  
PROCEDURES TO BE PERFORMED AFTER  
EVERY 100 HOURS OF USE  
When checking the machine to make sure that it  
is okay before using it, check the area around the  
muffler and remove any wood chips or leaves  
which have attached themselves to the  
brushcutter. Failing to do so could cause the muf-  
fler to become overheated and that in turn could  
cause the engine to catch on fire. Always make  
sure that the muffler is clean and free of wood  
chips, leaves, and other waste before use.  
1. Remove the muffler, insert a screwdriver into the vent,  
and wipe away any carbon buildup. Wipe away any  
carbon buildup on the muffler exhaust vent and cylin-  
der exhaust port at the same time.  
2. Tighten all screws, bolts, and fittings.  
3. Check to see if any oil or grease has worked its way  
in between the clutch lining and drum, and if it has,  
wipe it away using oil-free, lead-free gasoline.  
Check the intake air cooling vent and the area  
around the cylinder cooling fins after every 25  
hours of use for blockage, and remove any waste  
which has attached itself to the brushcutter. Note  
that it is necessary to remove the upper cover and  
the lower cover shown in in order to be able to  
view the upper part of the cylinder.  
7. Storage  
Aged fuel is one of major causes of engine starting fail-  
ure. Before storing the unit, empty the fuel tank and run  
the engine until it uses all the fuel left in the fuel line and  
the carburetor. Store the unit indoor taking necessary  
measures for rust prevention.  
8. Disposal  
When disposing your machine, fuel or oil for the machine,  
be sure to allow your local regulations.  
GB-7  
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GZ50N  
9. Troubleshooting guide  
Case 1. Starting failure  
CHECK  
fuel tank  
fuel filter  
PROBABLE CAUSES  
incorrect fuel  
fuel filter is clogged  
ACTION  
drain it and use correct fuel  
clean  
carburetor adjustment screw out of normal range  
adjust to normal range  
clean/dry  
correct (GAP: 0.6 ~ 0.7 mm)  
retighten  
sparking (no spark)  
spark plug  
spark plug is fouled/wet  
plug gap is incorrect  
disconnected  
Case 2. Engine starts but does not keep running/hard re-starting  
CHECK  
PROBABLE CAUSES  
ACTION  
fuel tank  
incorrect fuel or staled fuel drain it and use correct fuel  
carburetor adjustment screw out of normal range  
muffler, cylinder (exhaust port) carbon is built-up  
adjust to normal range  
wipe away  
wash  
air cleaner  
clogged with dust  
clogged with dust  
cylinder fin, fan cover  
clean  
When your unit seems to need further service, please consult with our ZENOAH service shop in your area.  
GB-8  
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LIMITED WARRANTY  
EMISSION-RELATED PARTS, FOR TWO (2) YEARS FROM THE DATE OF ORIGINAL DELIVERY OF THE UNIT,  
Husqvarna Zenoah Co., LTD / ZENOAH AMERICA, INC., THROUGH ANY Husqvarna Zenoah Co., LTD / ZENOAH AMERICA  
DEALER, WILL REPAIR OR REPLACE, FREE OF CHARGE, FOR THE ORIGINAL AND EACH SUBSEQUENT PURCHASER,  
ANY PART OR PARTS FOUND TO BE DEFECTIVE IN MATERIAL AND/OR WORKMANSHIP.  
EMISSION-RELATED PARTS ARE:  
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B
THE CARBURETOR ASSEMBLY, COIL ASSEMBLY, ROTOR, SPARKPLUG,  
AIR FILTER, FUEL FILTER, INTAKE MANIFOLD, AND THE GASKETS  
ALL OTHER PARTS EXCEPT ABOVE PARTS, FOR TWO (2) YEARS OF USE, NINETY (90) DAYS FOR RENTAL USE FROM  
THE DATE OF ORIGINAL PURCHASE, THE COMPANY, THROUGH ANY Husqvarna Zenoah Co., LTD DEALER, WILL REPAIR  
OR REPLACE, FREE OF CHARGE, FOR THE ORIGINAL PURCHASER, ANY PART OF PARTS FOUND TO BE DEFECTIVE IN  
MATERIAL AND/OR WORKMANSHIP. THIS IS THE EXCLUSIVE REMEDY.  
THE PURCHASER SHALL BEAR COSTS OF TRANSPORTING THE UNIT TO AND FROM THE Husqvarna Zenoah Co., LTD /  
ZENOAH AMERICA DEALER.  
THE PURCHASER SHALL NOT BE CHARGED FOR DIAGNOSTIC LABOR WHICH LEADS TO THE DETERMINATION  
THAT A WARRANTED PART IS DEFECTIVE, IF THE DIAGNOSTIC WORK IS PERFORMED AT THE Husqvarna Zenoah Co.,  
LTD / ZENOAH AMERICA DEALER.  
THE PURCHASER OR OWNER IS RESPONSIBLE FOR THE PERFORMANCE OF THE REQUIRED MAINTENANCE AS  
DEFINED BY THE MANUFACTURER IN THE OWNER/OPERATOR MANUAL.  
ANY WARRANTED PART WHICH IS NOT SCHEDULED FOR REPLACEMENT AS REQUIRED MAINTENANCE, OR  
WHICH IS SCHEDULED ONLY FOR REGULAR INSPECTION TO THE EFFECT OF “REPAIR OR REPLACE AS  
NECESSARY” SHALL BE WARRANTED FOR THE WARRANTY PERIOD. ANY WARRANTED PART WHICH IS  
SCHEDULED FOR REPLACEMENT AS REQUIRED MAINTENANCE SHALL BE WARRANTED FOR THE PERIOD OF  
TIME UP TO THE FIRST SCHEDULED REPLACEMENT POINT FOR THE PART.  
ANY REPLACEMENT PART THAT IS EQUIVALENT IN PERFORMANCE AND DURABILITY MAY BE USED IN NON-  
WARRANTY MAINTENANCE OR REPAIRS, AND SHALL NOT REDUCE THE WARRANTY OBLIGATION OF THE COMPANY.  
THE COMPANY IS LIABLE FOR DAMAGES TO OTHER ENGINE COMPONENTS CAUSED BY THE FAILURE OF A  
WARRANTED PART STILL UNDER WARRANTY.  
THE WARRANTY DOES NOT APPLY TO THOSE UNITS WHICH HAVE BEEN DAMAGED BY NEGLIGENCE OF  
INSTRUCTION LISTED IN THE OWNER/OPERATOR MANUAL FOR PROPER USE AND MAINTENANCE OF THE UNITS,  
ACCIDENTAL MISHANDLING, ALTERATION, ABUSE, IMPROPER LUBRICATION, USE OF ANY PARTS OR ACCESSORIES  
OTHER THAN THOSE SPECIFIED BY THE COMPANY, OR OTHER CAUSES BEYOND THE COMPANY’S CONTROL.  
THIS WARRANTY DOES NOT COVER THOSE PARTS REPLACED BY NORMAL WEAR OR HARMLESS CHANGES IN  
THEIR APPEARANCE.  
THERE ARE NO OTHER EXPRESS WARRANTIES.  
IMPLIED WARRANTIES INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE  
ARE LIMITED TO TWO (2) YEARS OF USE FROM THE ORIGINAL DELIVERY DATE.  
LIABILITIES FOR INCIDENTAL OR CONSEQUENTIAL DAMAGE UNDER ANY AND ALL WARRANTIES  
ARE EXCLUDED.  
SOME STATES DO NOT ALLOW LIMITATION ON HOW LONG AN IMPLIED WARRANTY LASTS OR EXCLUSION OR  
LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY  
NOT APPLY TO YOU.  
THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY  
FROM STATE TO STATE.  
IF YOU NEED TO OBTAIN INFORMATION ABOUT THE NEAREST SERVICE CENTER, PLEASE CALL Husqvarna Zenoah Co.,  
LTD / ZENOAH AMERICA, INC. AT (770)-381-5147.  
IMPORTANT: YOU WILL RECEIVE A WARRANTY REGISTRATION CARD AT TIME OF PURCHASE.PLEASE FILL OUT THE  
CARD AND SEND IT TO Husqvarna Zenoah Co., LTD / ZENOAH AMERICA WITHIN SEVEN (7) DAYS. BE SURE TO KEEP  
A COPY FOR YOUR RECORDS.  
ZENOAH AMERICA, INC.  
1100 Laval Blvd. Suite 110  
Lawrenceville, Georgia 30043  
GB-9  
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