This is a “must have ” item for any hobbyist dealing with modern or vintage bikes that have stock or aftermarket performance MIKUNI CARBURETORS installed on your machine. this is the latest edition of the SUDCO/MIKUNI FULL TUNER’S MANUAL that covers all VM, SMOOTHBORE, FLATSIDE and many other MIKUNI CARBURETORS. chock full of schematics, suggestions, tuning charts, jetting applications and instructions, altitude jetting changes, part #’s………you name it, it’s in here. almost 100 pages of incredible information. NO ADVERTISING IN THIS MANUAL, just hardcore instructions and information. one of those items that once you have it, you’ll wish i had them for sale years ago. got a case of these in from Mikuni so can offer at good price.