Jay,

OK, 15" of vacuum at idle!  Your Westy is now King/Queen of manifold vacuum
until someone can top that.
How many miles on your engine?  Original valve guides?

This is in line with the result of my experiment that I posted last
Thurs/Friday: in order for the fuel pressure regulator to give 28 psi at
the fuel line test tee you need 15" manifold vacuum (1.9L engine).

I connected my gauge to the same place you did when measuring vacuum.
Connecting the gauge to other locations didn't affect my measurements.

Scott Terry
'85 Westy "Pearl"
Santa Barbara, CA

>I am getting 15" at idle.  I adjusted my valves over the weekend as per
>Boston Bob's procedure.  Excellent so far.  Quiet valves and more power.
>Also, cold starts are much improved.  I backed off the adjusters to 0 lash,
>and just tightened ~1/4 turn.  I think most of the fuel pressure problems
>are vacuum related.  I would suggest replacing the FPR if it is still the
>original piece (10 to 20 years old).  I teed the vacuum guage in at the
>distributor/FPR line.  Is this where everyone is measuring it?
>                                                        Jay '85 Westy