Primary chain adjustment procedure

copper heating until cherry red and quenshing softens it, thats a fact.
Primary chain adjustment I fix the screw until I can hear noise is changing and the idle speed dont decrease.Then I lower the screw a bit and fix it.
 
For our purposes (getting a nice, soft but resiliant, seal) it makes no difference whatsoever if copper is left to cool in air or quenched. The advantage of water quenching is that it loosens the oxides and scale, leaving a cleaner part. Quenching from dull cherry red most definitely does not harden copper.

HTH, Paul
 
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