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Written by Vic R   


Yamaha J

Premium Unleaded
Fuel/Oil ration
Mixture adjustment - Low
1 1/2 - 2    (2 during run in)
Mixture adjustment – High
Tyre pressures (cold – in shade)
20 PSI
Front wheel spacers
20mm each side
Front wheel nut tension
Should be able to turn spacers with fingers
+2 mm
Wheel Alignment
+1 mm out
Rear Wheels
1330 mm
Chain Tension
15mm Slack

Run in procedure
RPM Range 
1st Session of 5 - 10 minutes
5,000 – 7,000 RPM
2nd Session of 5 - 10 minutes
5,500 – 8,500 RPM
3rd Session of 5 -10 minutes
6,000 – 9,500 RPM
Maximum recommened RPM after run-in.

Continually change the revs over the range specified in the table above.  This should be done under full load.  For example – a Yamaha J should continuoully be accelerated from 5,000 to 7,000 revs during the first session.

Allow the engine to rest for 5 – 10 minutes between each session.

Check all nut and bolt tension at the end of run-in

During the run-in period, excess fuel may accumulate in the air intake airbox.  Smoke will also be seen from the exhaust.  This is normal when engines are run at low revs.  The spark plug may foul due to excess oil in the engine.  Change plug if engine does not start.