RE: break in period does exactly what?

Ron Brown /
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Joel,

The break in period is to give the newly machined parts a chance to get to know each other better.

The finish on the machined parts has peaks which actually touch each other through the oil film when the parts are new. By running the machine gently, you allow these intefering parts to polish each other off slowly without generating enough heat to cause galling of the sufaces or even worse, seizing up.

The accepted norm for running in is to do everything gently. Never "lug" at low rpm and do not maintain high rpm for long periods. It is good to rev occasionally to "stretch" the internals so that you do not create wear ridges at the limits of travel which you will find, disastrously, when you do wind it up after the run in period.

On 4 cycles, dyno oil is usually recommended for running in, as synthetic is so good it keeps the rings from seating. I would assume this is the same for a two cycle.

The deposits on the cylinder and head are just byproducts of combustion and are irrelevant until they get too heavy, then you have to pull the head and clean them off.

Hope this helps,

Ron

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  speed kits- is 60cc safer?Topic by: Joel Joel 11/29/00 12:16PM
  RE: speed kits- is 60cc safer?Re: tim tim 11/29/00 09:26PM
  RE: speed kits- is 60cc safer?Re: Joel Joel 11/29/00 11:57PM
  RE: speed kits- is 60cc safer?Re: tim tim 11/30/00 10:24PM
  RE: speed kits- is 60cc safer?Re: Joel Joel 12/01/00 12:38AM
  RE: speed kits- is 60cc safer?Re: tim tim 12/02/00 01:00AM
  break in period does exactly what?Re: Joel Joel 12/04/00 12:36PM
  RE: break in period does exactly what?Re: Ron Brown Ron Brown 12/04/00 03:46PM
  RE: break in period does exactly what?Re: Joel Joel 12/04/00 11:32PM
  RE: break in period does exactly what?Re: Ron Brown Ron Brown 12/05/00 10:12AM
  RE: break in period does exactly what?Re: Ian Ian 12/05/00 12:39PM
  RE: speed kits- is 60cc safer?Re: Joel Joel 12/05/00 11:31PM
  RE: Installation 60/70cckitsRe: Armando Armando 12/29/00 09:22PM

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