Cleaning up a spare set of carbs sure sounds ideal. I could replace the original with rebuilt, and still be able to put the original back in case the my rebuild of the spare is botched. Now, gents, can I buy a used complete set for my '80 CB750K? Oh? you have one in your back pocket? Nice! Only 25$ bucks? free shipping to Florida? You don't say! SOLD! Or Best Offer?