If you're having trouble tuning your PI TR6, check the following:
Date: Tue, 30 Jun 1998 12:28:54 +0100
From: Gernot Vonhoegen
Subject: RE: SU Needles and things
Dave, one thing to check before you throw all the pi stuff out. Take out all injectors and check they actually sit tight in their tubes. I had four out of six where the rubber o ring was squashed. Result: petrol pouring by.
Gernot