are all round tops the same?

[Bruce Palmer]

.... and You are right this is not intended as a bash, only a statement about the process being improved through the talents of another craftsman. Gotta be real careful here......

Steve was able to, in about the first 3 days they had the company, redesign the machining involved in the installation of the double sealed roller bearings allowing tighter tolerances in assembly and tighter seal around the throttle shaft and butterfly.

We were in Orange last year and this, but because of my other duties to Zero Rust, I fly down for the show and come home after. Steve and Pam were most definitely on the tour last year though..... Good excuse for a road trip for them. Don't know about next years scheduling with MSA and the national.

[clutchdust]

wow, quite the busy little thread we have going here!:classic:

since i know next to nothing about these carburators, bruce can you explain to me what the biggest advantages and disadvantages are to them in stock form. and then tell me what you do to fix that (and an idea of how much that costs).

at this point, i just want to get it running well enough and focus on the suspension and brakes. then, once that stuff is done and i have a few bucks to spare, i'm finding a chevy 4.3 v-6!:devious:

love my chevy power!

[Bruce Palmer]

And I'm using "SU" interchangeably with Hitachi.......

These carbs came new with bushings on the throttle shafts and that fit, leaked some air the day they were new. In the ensuing 30+ years they have not gotten any tighter, so this is the Achilles heel of these carbs to this day. Once you start leaking massive quants of air past the shafts, the carbs will run rich or lean and back and forth just based on the air leakage taken place past where the air and fuel are supposed to mix.

Steve machines the carb bodies (after polishing) to accept double sealed roller bearings and hand fits these along with the shaft and butterfly. It is really interesting to watch this process that takes what was a fairly crude casting design from the manufacturer and turn it into a trouble free trouble free carb.

Okay, the complete verbiage is on the web site that covers all the steps we go through on the carbs, but what I'd like to do is lay out for anyone who is looking at their carbs wondering what to do next with yours.

For most new customers we get, I suggest they buy our JUST SUs video (the 2 tape version for $20 is better quality) and use the video as a teaching tool to go through your carbs, clean them up, check out the few components that are there, put them back together, run 'em and see what you've really got. Cleaning alone can solve a lot of running issues. If they run well, you just saved $600, if the shafts and bushings are worn out and the general condition is too far gone, then you know you are spending the money because it needs to be spent.

Here we offer several ways to go too. The complete reman deal gets carbs ready to bolt on (w/3 yr warr), or you can buy just the machined bodies and swap your stuff over or add the Tune up kit that essentially has all the consummable "wear parts" that need to be renewed in a real rebuild. Our tune up kit should not be confused with the "rebuild kits" from the parts store. Kit contents are spelled out on the web site so I won't go into that here.

This is the way we approach helping anybody get started with squaring away a set of 30 something year old SUs. If, by reading through this and gaining the feeling that it is maybe not an undaunting task, you can take the next step, then we've helped.

SUs are not rocket science. They are really very simple in design and function and once the 3 or 4 things on them that need renewing and adjusting are right, they are hard to beat. I am a life time subscriber to the "KISS Thereom".......

Again, the JUST SUs video that Scott did is a real valuable training aid. It's not fancy from a production standpoint, but he drilled the content.

Sorry this has run on so long but I go through this over and over and thought if by spelling it out here in writing, it will shorten anyone's learning curve, then it needed to be done.