Hi Byron, there are a couple of versions of the Kawasaki #KRB750B backpack blower, so please check the first link below to get the parts list for your model. I've looked up a couple and the 2nd link below shows what I've found on the Kawasaki website for parts for these units.
Select model number from this list:
http://kmcb2c.econnect.partsandwarranty.com/kmcb2c/Menu?action=CATALOGB2B&chID=302125&elementType=1&historyDepth=-1&CHANGENUMBEROFITEMS=63
Here's one of the exploded drawings with parts available, etc.
http://kmcb2c.econnect.partsandwarranty.com/kmcb2c/Menu?action=CATALOGB2B&prodID=3169045&elementType=2&historyDepth=2&CHANGENUMBEROFITEMS=63
Once you've confirmed the model variation you've got, you can then contact either a local Kawasaki dealer or check the internet for a supplier that can sell you what you need.
As far as taking the unit apart, make sure that the gas is drained into a gas container and then allow it to stay vented before you begin taking the blower apart. My suggestion is to take a picture with either your digital camera or camera phone, of the unit BEFORE you start taking things apart and at EACH step as you remove a part (screw, etc.) so you'll be able to refer back to those pictures when you start to reassemble it. That and the line drawings at the above links, will make it much easier to recall just where each part goes and how it went together.
You can also use the Dealer Locator feature on the Kawasaki site to find one near you, or to call and place your parts order, etc.
By the way, I did read your question and noted that you DID put in the brand and part number for your blower, so thank you for providing enough information to help me resolve your problem!
I hope you find this Very Helpful and best regards!
