[Keith True]

For SU parts,repair and info there is a fellow in New York named Joe Curto that is very helpful.Most SU carb problems are SU owner problems.They turn out to be ignition problems,valve problems,filters,pumps,etc.They are almost a primitive carb.They really are a set it and forget it type of thing.If they are sucking the oil out of them they have internal problems,usually caused by somebody getting carried away with cleaning the piston/dashpot bores and plungers.I've had SU's that I've had to change the oil in because it was so old it turned to grease.I've really only worked on one SU problem that was an actual carb problem.The rest were other problems that were made worse by guys fiddling with the SU's.I worked on a Daimler SP 250 that the owner was sending to the shop every month to get the carbs set up.That's just not right.Turns out the dual point distributer was running on one set of points.But,if the shop monkeyed with the carbs it would sound better for a while.I can sit and think of a dozen more problems that had people tearing into their SU's when there was nothing wrong with them.They really made a slick carb for a Harley too.Then the S&S came out and everybody went to them.If I was going to use anything other than a stock Zenith,I would use an SU.