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General small engine adjustment practice.

Brucejb50's Avatar

Join Date: May 2017
Posts: 1

05-18-17, 01:25 PM   #1  
General small engine adjustment practice.

What are the pros/cons to adjusting magnetos and valves to the lower and higher end of their specs?

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BFHFixit's Avatar
Forum Topic Moderator

Join Date: Jun 2007
Posts: 1,759

05-18-17, 03:46 PM   #2  
There is none, for the short answer.
Either simply need enough clearance to perform their intended function at all engine operating temps.

In the case of the magneto, it simply needs an air gap that is not too large. As long as no physical contact occurs by too small of clearance, and too large of gap that will not allow the magnetic field to produce flow, the output is the same.

In the case of the valves, as long as there is enough clearance to allow the valve to close completely when intended, and not so much that the valve will not open, or not open enough, then either end of the spec should be fine.

Personally I think most of the tolerance is built in to allow for those doing the adjusting. There is some knack to measuring down to thousands of an inch.

Just needs a bigger hammer

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