Oops, I forgot to mention that the engine is turned over 
by hand with this method.  You're right, using the 
starter could result in something unpleasant!  It's also 
tough to make the crank turn backward, too...  ;^)

Basically the method involves reversing the crank 
rotation after the stop has been contacted the first 
time.  Because symmetry involved the timing mark will be 
at it's "mirror image" position when the stop's 
contacted the second time.  After that it's just a 
matter of splitting the difference between the 2 timing 
mark positions.

This is one of those questions that's a lot easier to 
answer with visual examples!

Brad

> I'm not a big fan of the piston stop. What happens if it is too long? Well,
> you don't want to find out.
> 
> I'm also not getting the idea about TDC being between the top of the
> combustion stroke and the top of the exhaust stroke. If that is what you're
> saying, it's not true. Maybe I am misunderstanding you though.
> 
> John Nasta


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