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Carb Air box,.,

Really, there are online parts listings all over. This is from Partzilla:
This Honda*17213-425-010 HOUSING, AIR CLEANER*fits the following models and components:

Honda Motorcycle 1982 CB750C A - 750 CUSTOM Air Cleaner

Honda Motorcycle 1981 CB750C A - 750 CUSTOM Air Cleaner

Honda Motorcycle 1982 CB750SC A - NIGHTHAWK 750 Air Cleaner

Honda Motorcycle 1980 CB900C A - 900 CUSTOM Air Cleaner

Honda Motorcycle 1980 CB750K A - 750 FOUR K Air Cleaner

Honda Motorcycle 1981 CB750K A - 750 FOUR K Air Cleaner

Honda Motorcycle 1980 CB750C A - 750 CUSTOM Air Cleaner

Honda Motorcycle 1979 CB750L A Air Cleaner

Honda Motorcycle 1982 CB750K A - 750 FOUR K Air Cleaner

Honda Motorcycle 1979 CB750K A - LIMITED EDITION Air Cleaner

Honda Motorcycle 1980 CB750F A - 750 SUPER SPORT Air Cleaner

Honda Motorcycle 1983 CB750SC A - NIGHTHAWK 750 Air Cleaner
 
If you can't find one, I have an air box. But it's missing the door for changing the air cleaner. The rubbers are in OK to poor shape. I could send you what I have for the cost of postage.

 
Ok let me think about that,.,? You want to send me pics to my email.? I was told by Honda correct part # is 17213-425-020
It should be, I'm actually finishing up on a 81 CB 750 K restore. I bought someone's failed project lot of almost 3 bikes, I thought I could build 2 from the lot, but I only had 1 good engine and title. I've sold most of the spares on eBay. Been thinking about pitching the air box because it's missing the door. I'll PM you my email.

 
It isnt hard to get rid of the Airbox. I have 2 cb750's one is an 81 k four and the other is a 79 cb750f super sport. I run velocity stacks on both. All you need to do is put a stage 3 jet kit in it. I had to fine tune the k model more than the ss. You dont have to change the exhaust to run a stage 3 but you will need 3 spacers on your needles rather then 2 as suggested.
 
To rebuild the carbs properly you'll need new diaphragms or you will run into full throttle issues. I've rebuilt 2 and tried everything you see online and I can tell you the best thing to do is rebuild the carbs and whatever parts you buy make sure they are genuine honda parts or you will regret it.
 
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