OWNER’S MANUAL
2015
MASTERFOX 125cc
16
Inspect the spark plug electrodes for wear. The center electrode (1) should have square edges.
The side electrodes (2) should not be eroded.
The insulator should not be cracked or chipped.
Check the spark plug gap (3), using a wire-type feeler gauge. If an adjustment is necessary, bend
the side electrode carefully to open or close the gap, which should be 0.024- to 0.028-in. (0.60 to
0.70mm). Make sure the plug washer is in good condition. If you need to install a new spark plug
check and, if necessary, adjust the gap.
With the plug washer attached, thread the spark plug in by hand (to prevent cross-threading).
Do not force-fit the plug.
Tighten the spark plug about 1/8 to1/4 turn after it seats, if the old plug is good, or about 1/2 turn
after it seats if installing new plug.
NOTICE!
Improperly tightened spark plugs can cause dam-age to the engine. A loose plug can cause a
burned piston; over-tightening the plug can damage or strip the threads in the cylinder head.
SUSPENSION
Loose, worn, or damaged suspension components may adversely affect the handing and stability of your
Masterfox.
Front Suspension Inspection
Check fork operation. Pull the front brake lever in to lock the brake. Then push up and down on the fork
legs several times. The suspension should function smoothly. There should be no oil leakage. Check to be
sure that the fork mounting bolts and handlebar riser mounting nuts are tight.
Rear Suspension Inspection
Place the Masterfox on a maintenance stand. Either strap securely in place or have a helper hold
the Masterfox while you push hard against the side of the rear wheel and feel for any free play
which indicates worn swing arm bushings. Do not ride with worn swing arm bushings.
Check that the fasteners for the shock absorber attachment points are secure.
Shock absorber attachment points
Shock absorber bushing
Check that the shock absorber bushings are not worn, check for oil leaks in the shock absorber.