I bought a cb450 and in the process of restoring. The carbs do not have springs on top of the slides. I have doing some research and it looks like some carbs have springs and some do not. Does anyone have any input on this?
The CB450 carbs do not have springs and they are vacuum pistions. In my experiance, Keihin CV vacuum pistion do not have springs. The Keihin vacuum diaphragm carbs have return springs. This is only an observation of the carbs i have taken apart.
Certain later 4-speed 450's used a retro-fit spring installed under warranty.
Don't remember the carb numbers, but of no concern to you with a K6 or whatever.
No 5-speed ever came with springs.
You also cannot tweak the needle position........
If you have the old air filters, you can do like I and others have done and remove the paper element from the metal frame and replace with unifoam, no rejetting required and the filters are cleaned and oiled as needed. Using pod filters, there is rejetting to do and some do not work at all, I forget the brand.
FWIW, I got my 450 out Sunday for its first ride this year and also its first ride in Colorado. Happy to note that it runs as well as it did in Oklahoma with the remade stock filters/uni-foam I did a few years ago. She needs a good clean and service but I still highly recommend rebuilding your own. I intentionally made the inserts oversized so they would seal properly without glue. That way you can take them out and wash and oil them as needed without having to pull the filter box off the bike.
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