| 403 Carburetor Jet and Metering Needle Size [message #358409] |
Tue, 08 September 2020 09:36  |
Greg C.
Messages: 224
Registered: October 2019
Location: Knoxville, TN
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My original carb had the fuel filter housing JB Welded in. In order to get the coach running, I bought a used carb from Chuck Boyd from a 1978 coach. Supposedly, the 1977 and 1978 carbs are identical. They even have the same number except for the year designator. And this one was labeled REMANUFACTURED.
When I pulled the top off the new carb, it was obviously going to need gaskets, pump, etc, so I ordered a good kit and bought Cliff Ruggle's Quadrajet book. I used to build Quadrajets back in the day, but this book is very helpful.
Anyway, what I read in Cliff's book took a little air out of my sails in that he states remanufactured carbs were built with a generic jet and needle combination so they would run several different vehicles with some level of success, but they are not tuned vehicle specific. That means it most likely does not have the TZE factory original jets and needles. I'm not so much concerned with the secondaries, but I would like to get the correct jet/needle combination for it on the primaries.
I'm also going to have to put bushings in the base plate, as the throttle shaft bores are worn, a typical problem for these.
So, does anyone know what the factory jet/needle combination was for the 1977/78 403 for our coaches?
Thank you.
Greg Crawford
KM4ZCR
Knoxville, TN
"Ruby Sue"
1977 Royale
Rear Bath
403 Engine
American Eagle Wheels
Early Version Alex Sirum Quad bags
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