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Petrol Powered Chainsaws

E&OE

©2017 MTM

26

Spark Plug

If the spark plug is damaged (cracked insulator, broken or eroded electrodes etc), replace it. •
Always use spark plugs of the correct "heat range" - see

. • Depending on model, the

spark plug may be accessible directly, or may be located underneath the air filter cover.

The spark plug is used to ignite the air/fuel mixture inside the engine. The spark plug has electrodes on one
end and an electrical terminal on the other. The spark plug requires regular maintenance.

Cleaning and Gap Checking

The spark plug should be checked and cleaned as per the maintenance schedule.

1. Remove any carbon deposits on the spark plug (

A

) electrodes (

B

) with a wire

brush.

2. Clean the spark plug threads and the electrical terminal (

C

) on the top.

To check and adjust the spark plug "gap":

1. Use "feeler" or "thickness" gauges (

X

) to measure the existing gap. The gauge

must drag a little when being slid between the electrodes (

2

)

– this means the

measurement is fairly accurate.

2. Adjust the gap to within specification (see

). If the gap needs to be

reduced, gently tap the electrode as required. If the gap needs to be increased,
use pliers to gently pull the electrode as required.

3. Measure the gap again and ensure it is within the specified range before re-

installing the spark plug.

Removal/Installation

1. Pull the electrical lead (

A

) and rubber boot (

B

) from the terminal on top of the spark plug (

C

). On some

models, the spark plug is accessible from underneath the air filter cover and/or underneath the air filter.

2. Clean the area around the spark plug so that no dirt or other material can enter the engine when the

spark plug is removed.

3. Use the spark plug tool (

D

) to remove the spark plug (rotate left).

To re-install the spark plug:

1. Place the spark plug in its hole and screw it in (rotate right) until "finger tight".

2. Use the spark plug tool to tighten the spark plug approximately one quarter turn (do not over-tighten).

3. Place the electrical lead over the spark plug terminal and push it down so that it connects firmly terminal.

4. Re-install the rubber boot and ensure that it is seated firmly against the machine body. Re-install any

other components (air filter, air filter cover etc) that were removed to access the spark plug.

A

B

B

X

C

A

B

C

D

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Summary of Contents for 58SX

Page 1: ...r 2017 READ THIS MANUAL CAREFULLY BEFORE USE FAILURE TO DO SO MAY RESULT IN INJURY PROPERTY DAMAGE AND MAY VOID WARRANTY KEEP THIS MANUAL FOR FUTURE REFERENCE Products covered by this manual may vary in appearance assembly inclusions specifications description and packaging ...

Page 2: ... loose clothing or jewellery which can be caught in moving parts Keep hair and clothing away from the equipment Stay alert and use common sense when operating the equipment Do not over reach Always maintain secure footing and balance Do not use the equipment if tired or under the influence of drugs alcohol or medication This equipment is not intended for use by persons with reduced physical sensor...

Page 3: ...ting the electrical cord Do NOT use equipment that has exposed wiring damaged switches covers or guards Do NOT use electrical equipment in wet conditions or in damp locations Do NOT use electrical cords to lift move or carry equipment Do NOT coil or knot electrical cords and ensure electrical cords are not trip hazards General Service Information The equipment must be serviced or repaired at autho...

Page 4: ...product may have blades edges or mechanical devices that can cause severe crush injury to fingers limbs etc Take due care when handling and using the product Single Operator Only The product must be operated by a single person only More than one person operating the product may introduce additional hazards Use Face Protection Wear appropriate full face protection and take due care as the product o...

Page 5: ...oduct Do NOT use in rain damp or wet conditions Electrical shock can be fatal Electrocution Electrical Shock Hazard Disconnect High voltage or high current electricity may be present or required by the product Always disconnect the product from the electrical supply before handling the product adjusting maintenence etc Power Line Electrocution Hazard High voltage high current power lines may be pr...

Page 6: ...ons in fingers hands Clothing and Protective Equipment All Operators and Assistants Wear approved safety goggles or safety glasses with adequate top and side protection In addition to eye protection wearing a full face shield is highly recommended Wear suitable hearing protection Wear an approved safety hard hat Wear heavy duty non slip leather or protective gloves Wear approved heavy duty safety ...

Page 7: ...y branch limb pruning or cross cutting ensure that none of the materials to be cut is under tension that may be released unexpectedly during cutting Tree felling should be performed by trained and experienced personnel only If in any doubt seek assistance and advice Transportation Safety Always STOP the engine and activate the chain brake before putting the machine down transporting or working on ...

Page 8: ...ngine 17 Environmental Considerations 17 Chainsaw Operation 18 Understanding and Avoiding Kick Back and Other Reactionary Forces 18 Using the Chain Brake 19 Basic Cutting Guidelines 20 Maintenance 21 Maintenance Schedule 2 Stroke Engines Machines 22 Saw Chain and Chain Bar 23 Inspection and Cleaning 23 Chain Lubricant 24 Air Filter 25 Inspection and Cleaning 25 Removal Installtion 25 Spark Plug 26...

Page 9: ... 2017 MTM 9 Removal Installation 28 Engine Tuning Guidelines 29 Carburettor Adjustments 29 Tuning 30 Cleaning Guidelines 31 Transportation and Storage 31 Troubleshooting 32 Specifications 34 Engine Service and Maintenance Record 35 ...

Page 10: ...T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M ...

Page 11: ...M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M ...

Page 12: ...duct warranty BB CC AA B A M T M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T T M M T M M T M M T M M T M M T M M T M M T M M T M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M...

Page 13: ... M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M...

Page 14: ... T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T...

Page 15: ...the chain drive cover nuts are properly tightened before use and during cutting The saw chain will stretch with use so it is important to check chain tension before and during use The saw chain cutters are very sharp wear suitable protective gloves when handling the saw chain Do NOT check chain tension with the engine running Do NOT adjust chain tension with the engine running Correct saw chain te...

Page 16: ...ust if necessary A LOOSE TIGHT CORRECT A B B SIDE MOUNT FRONT MOUNT C M T M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T T M M T M M T M M T M M T M M T M M T M M T M M T M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T T M M T M M T M M T M M T M M T M M T M M T M M T ...

Page 17: ...es at or above 1500m approximately 5000 adjustments to the carburettor may be required This is because there is less oxygen in the air as altitude increases which effectively enriches the ratio of fuel to air going into the engine and the higher the altitude the richer the fuel mixture becomes If the engine is being permanently operated at high altitude it is recommended to have an authorized serv...

Page 18: ...angle and saw chain condition Kick Back Kick back is a reactionary force that causes the chain bar to rotate up and back against the direction of cut Kick back can also be thought of as the chain cutters at the tip of the chain bar the kick back zone digging in to the object to be cut and momentarily stopping or significantly slowing rotation of the saw chain which causes the chainsaw to suddenly ...

Page 19: ...chain brake handle backward until the brake disengages Always disengage the chain brake before commencing cutting work Testing To check operation of the chain brake engage it then start the engine With the brake still engaged run the engine to full throttle for no more than 2 seconds if the saw chain does not rotate the chain brake is operational If the saw chain rotates at all during the test do ...

Page 20: ...rizontal cut 6 of the felling notch Remove the section of trunk Make the horizontal felling cut 7 approximately 25 to 50mm 1 to 2 above the centre of the felling notch and extend it into the trunk so that approximately 10 of the trunk remains uncut to create the hinge E do NOT cut through the hinge To start and control direction of the fall drive wooden wedges into the felling cut 7 as needed M T ...

Page 21: ...intenance is required In addition to normal service requirements and as with many smaller machine and off road bike engines the following parts as applicable for petrol diesel or 2 stroke engines may require replacement during a major service Piston rings Big end bearings Small end bearings Gudgeon pin Oil rings Gaskets and seals Valve seats Inspection of the following items is required Piston for...

Page 22: ...T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T ...

Page 23: ...and remove the cover C Be careful to prevent the chain bar falling out 3 Carefully extract the saw chain E from the chain bar F groove and chain drive gear then remove the saw chain 4 Carefully lift the chain bar from the chain drive cover studs G 5 Clean away any sawdust wood particles dirt etc from the chain drive cover clutch chain brake and tension adjustment mechanism and threads H it is easy...

Page 24: ...M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M ...

Page 25: ...y require removal of another locating screw or clips To install the air filter 1 Insert the air filter element and ensure it is correctly positioned in relation to the air intake assembly as it will seat and seal properly in one position only 2 Re install the filter cover ensuring it is fitted properly against the engine and secure it with the screw rotate right and tighten by hand Do not over tig...

Page 26: ...ver tighten 3 Place the electrical lead over the spark plug terminal and push it down so that it connects firmly terminal 4 Re install the rubber boot and ensure that it is seated firmly against the machine body Re install any other components air filter air filter cover etc that were removed to access the spark plug A B B X C A B C D M T M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M...

Page 27: ...M T M M T M M T M M T M M T M M T M M T M M T M M T T M M T M M T M M T M M T M M T M M T M M T M M T M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T ...

Page 28: ... T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T T M M T M M T M M T M M T M M T M M T M M T M M T M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M...

Page 29: ... causes the cylinder temperature to rise which often leads to engine seizure and for excessive revving which may result in connecting rod bearing failure Other causes for a lean running condition include lack of oil in the fuel mix and when the fuel tank runs empty Before any engine tuning Service the air filter Service the spark plug Use fresh fuel Carburettor Adjustments The engine carburettor h...

Page 30: ...n adjustment position Then rotate the screw IN to a position where the engine idles best it should be about midway between the rich and lean position settings At this point you may have to re adjust idle speed step 2 4 Adjust High Speed Mixture Rotate the adjustment screw one quarter turn at a time rotate IN right clockwise to lean the high speed mixture rotate OUT left anti clockwise to richen hi...

Page 31: ...a Drain the fuel system It is advised to have the fuel tank as empty as possible before draining b Remove the spark plug and put 5ml of clean engine oil into the cylinder Pull the starter cord slowly several times to distribute the oil Re install the spark plug Cover the equipment to protect it M T M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T T M M T ...

Page 32: ...ngine Engine starts but does not idle Possible Fault Action Blocked air filter Perform an air filter service Idle speed requires adjustment Adjust idle speed until engine runs smoothly and at a reasonable speed when idling Cutting is poor Possible Fault Action Blades dull or damaged Sharpen or replace saw chain Engine in poor state of tune Tune engine M T M M M T M M T M M T M M T M M T M M T M M ...

Page 33: ...e fasteners not carburettor adjustment screws for tightness M T M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T T M M T M M T M M T M M T M M T M M T M M T M M T M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M ...

Page 34: ...M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M ...

Page 35: ... T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T M M T...

Page 36: ...ecific application or your description of the application Be sure to attain third party approval for your application from a qualified specialist before use regardless of prior assurances by the retailer or its representatives This product is not intended for use where fail safe operation is required As with any product take an automobile aircraft computer or ball point pen for example there is al...

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