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I was going to use a jet from one of my spare kits in my TR3. I had several kits, all opened but all SU 963 for H6 carbs. The opening in the side of the jet is obviously smaller but as far as I can tell, measuring with drill bits, the orifice is the same. I polished the old one instead. The old one is clearly marked B.100, nothing on the new one. Just curious at this point.
Tom
Tom