Contact Hatfield Aviation (HOU) ph: (713) 644-1464
Bill Hatfield is now gone to fly a bit higher, but he left his company to his employees. They have always done excellent work on all accessories (and they did the carbs on the Hughes S76 Sikorsky Amphibian after it was retrieved from beneath Lake Mead... they are the only guys that have a genuine carb flow-bench that I know of in Texas.. and NASA uses them exclusively for certain hard-to-repair accessories.* They've always been very fair on price, as well.)
I don't know if they can give you the type info you are hinting at, however. Whatever PN's are appropriate for the carb is what you should install. This is not a matter of tinkering like you might with a hot-rod. (Someone may have already tried that with your present carb with the results you now see. Replace them with what is called for.) Be certain you have the correct carb PN 10-4439... not some PN for a GO-300 or some other engine. C-125's also use a carb which will bolt right up and run, but not correct.
* NASA had a problem back in the early 80's with some somewhat rare LeLand generators frequently failing. Their research found that overhaul procedures were not being followed, even by highly-respected, well known suppliers. So NASA did a little "secret" experiment. They sent out freshly overhauled generators to 5 shops and asked the units to be overhauled. What NASA did not tell the facilities is, that they'd carefully identified in a secret manner, all the parts called for replacement in the mfr's manuals.
When the generators were all returned, with fresh tags and supposedly overhauled.... of all 5 approved suppliers, only Hatfield had actually replaced all the parts called for. The other 4 had inspected, found what looked like new parts, and recorded fresh overhauls, and returned the units to NASA/Clear Lake with invoices for the "work".
Now you and I might think what the 4 shops did was sensible. But, in fact, they did not do what they were asked to do. Further, they charged their full price for the "overhauls".
Bill Hatfield's shop inspected the incoming generators, and of all the shops involved, were the only shop to actually call NASA to determine if NASA was aware of the apparently excellent condition of the generators, and also ask if Hatfield was understanding the work order to completely overhaul the units despite condition. They were told by the NASA respondent that no further information was available and that all which could be offered was to follow the service request.
Hatfield overhauled the units, and included all the removed (apparently new) parts in a plastic bag which was returned to NASA along with the generators. Not only that, but Hatfield's invoice was almost one-third less than the next-closest invoice from the other 4 "overhaul" facilities.
Bill's company won the everlasting respect of the NASA folks at Clear Lake, and the others won a call from the GAO.
Bill was a young guy in the Houston Hobby Old-Days who was trying to get a DC-3 rotary-inverter overhauled and walked into a small, well-respected, local airport repair shop. He struck up a conversation with the owner, who wanted to retire, and the owner so liked Bill he offered to sell/give him his business/customers-list and stay with Bill long enough to teach him the business. Bill never forgot the kindness shown him, because he was in hard times and needed a job, and here a guy was setting him up in business. Bill passed along the favor to his long-time employees when he died.
I ran into Bill a few years ago purely in an out of context place... a small cafe on the hwy near Spicewood Texas. As I passed while leaving the cafe, I noticed an older gentlemen entering the cafe and I remarked to Jamie, "Hey, that guy looks like a guy I know in Houston, Bill Hatfield." (I hadn't seen Bill in 10 years at that point.) A woman who was walking to catch-up to him overheard my comment and turned around and looked at me, "That IS Bill Hatfield. I'm his wife. Do you know Bill?" Of course, she was just as surprised by my remark as I was to see someone I thought looked like Bill, since they were so far out of town on a trip.
It was a remarkable visit with an old friend. He died a couple years later.
