Michigan USA Raptor 900, User Manual

Raptor 900 Compact Wood Chipper/Shredder 

E&OE 

©2018 Michigan USA 

19 

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 

Specifications

. 

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 

Specifications

). 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

) from the terminal on top of the spark plug (

B

). 

2.  If accessible, 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 (

C

) 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 with the 

terminal. 

A 

B 

B 

X 

C 

B 

A 

C 

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