From: Toomny5s "at" aol.com
Date: Tue, 31 Aug 1999 11:13:08 EDT
Subject: Re: New Engine Break-In

In a message dated 8/30/99 7:10:27 PM Eastern Daylight Time, stoodley "at" ipa.net 
writes:

<< This is essentially how we break in the MX bikes. I like to use 3 periods 
of
 15 minutes each, gradually increasing the engine load. The cool-off period
 is the key, you can't cheat- totally cool, otherwise hotspots will develop
 and cause scoring/scuffing which may show up later. With the plated bores,
 you are bedding in the rings AND the piston. With the type of rings used
 now, synthetic premix oil is O.K. Change gearbox oil, check plug color (most
 bikes are jetted rich from the factory), retorque  fasteners (all fasteners)
 and coolant level.
  >>
Jon,

I remember the cool off period being essential back when I had mxers in the 
70s.  I thought it applied to the air cooled machines and was discounted when 
liquid cooling came around.  That is, the complete cooling. The thought being 
they get to a stable temperature, not getting as hot.  It is still 
recommended (the cool off) for all liquid cooled motors?

Matt