Hello,
I received some good advice on float needles in another recent thread, but there are a few more questions bouncing in my head. First off, this is only my second carb rebuild (first was on a GT750 that went well). I'm reasonably mechanically inclined, but I don't have enough experience to know what is important or not. Anyway, here goes...
Th motorcycle is a 1978 KZ1000-A2. Frame numbers fall in Japan manufacture range here:
www.zedder.com/Info/78%20KZ1000-A2.htm
But, when I look at carb internal parts, the numbers seem to fit the data in the Clymer manual for the 1977 Std. model (A1 I guess). This is what I have on my carbs:
Throttle valve: 1.5
Jet needle: 5CN8 - 3rd grove
Main jet: 110
Float valve: 2.3
That seems to match the 1977 Std. model except the main jets are listed as 107.5 (close).
(I have an A2A service manual too, and the specs on carb parts there match Clymer for 1978-1/2, very upper-right in the table.)
I read on another thread that the numbers stamped on the carbs below the choke lever can help identify sub-model and year, but I haven't found a resource that helps identify what I have:
299
02
OK, the questions:
1. Do I have an A2 bike with A1 carbs? Are these not the original carbs, or is it possible that they are original and some A1 parts made it into my A2? This is mostly curiosity, except in may influence how I rebuild.
2. What main jets should I have in there? There are old 110s in now from when I bought it. I also have aftermarket sets of 105s and 102s. 105 is the size Clymer gives for the A2. I don't have the stock size for the A1 (107.5s). Should I buy 107.5s or use something I have? BTW... What do these numbers mean? I'm sure they have something to do with the size or shape of the jet hole, but is bigger number = bigger hole? How sensitive is change in next size up/down on motorcycle performance?
3. When I first took these carbs out 2 years ago (motorcycle not running well since), I did not note the setting on the piolet screw. I have since learned that this is important and the nominal setting is about 1-1/4 turns out. Should this go smoothly if I roll with that, or am I in for trouble? What should I know to sort this out? Also, should I:
- Use old Mikuni pilot screws, little worn, I don't know which came out of which carb
- Use new aftermarket screws (which I have)
- Buy new Mikuni pilot screws?
(Like I said... I don't know what's important.)
4. Anything else I really need to know?
Thanks for your help, and bearing with all my questions,
Tristan
P.S. It's frustrating/confusing that this Kawasaki page is missing all but one part number. Figures...
www.kawasaki.com/Parts/PartsDiagram/144171/1978/KZ1000-A2
P.P.S. I tried to upload pics, but I keep getting "Forbidden" messages.