Guide to changing fuel mixture Needles on SU carburettors. How to do it and what to watch out for.

This video discusses changing the mixture needles on HS2, HS4, and HIF carburettors. What to watch out for and how to set the needle height position correctly. This is extremely important for doing needle comparisons! please note: the height of the piston cushion for an HS4 is 0.008 to 0.012" If you haven't seen the Baselining video, go watch that first. It will help you get your mixture very close to perfect at idle. Darren Thanks for watching Darrens Restorations! Please note Darrens Restorations assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Darrens Restorations recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, expensive electronics, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of Darrens Restorations, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not Darrens Restorations. Only attempt your own repairs if you can accept personal responsibility for the results, whether they are good or bad.