TOPIC:

Cool, thanks KzRon. I just found another one on e-bay if anyone want's it. It's portable.

item 180110654680

Post edited by: N0NB, at: 2007/05/12 08:33

KZRon, my bike is a 79. The ones listed are 77-78. Did Kaw just have them lying around and stuck them on my 79?

RonKZ650 wrote:

Kawasaki Service 4/600-11, 10/21/77

Recently the carburetors of the KZ650 were changed from the pilot screw type to the air screw type. During the transition from one carburetor type to the other, several hundred units were equiped with carburetors that had both air and pilot screws.
Units with transition carbs:
1977 KZ650B Frame # KZ650B024641-026991
1977 KZ650C Frame # KZ650C007751-010000
1978 KZ650B Frame # KZ650B027901-028701
Dealer action:
When you tune a unit with transition carburetors, turn the pilot screws all the way in. This will ensure good idling and smooth running. The air screw setting is the same as the air screw type carburetors.
Pilot screw- Turn all the way in
Air screw- 2 +/- 1/4 turns out.
Direct from Kawasaki.

No, they are not original on your 79. In 1979 they had the airscrew type with the accelerator pump. Somewhere over the years someone has swapped these older carbs onto your bike. Now the strange thing is a guy gave me a 1979 KZ650B3 a few years ago and it also has these transition carbs on it. So this is very strange coincedence because I know Kawasaki did not use these carbs in 1979 for emissions reasons.
vach wrote:

KZRon, my bike is a 79. The ones listed are 77-78. Did Kaw just have them lying around and stuck them on my 79?

RonKZ650 wrote:

Kawasaki Service 4/600-11, 10/21/77

Recently the carburetors of the KZ650 were changed from the pilot screw type to the air screw type. During the transition from one carburetor type to the other, several hundred units were equiped with carburetors that had both air and pilot screws.
Units with transition carbs:
1977 KZ650B Frame # KZ650B024641-026991
1977 KZ650C Frame # KZ650C007751-010000
1978 KZ650B Frame # KZ650B027901-028701
Dealer action:
When you tune a unit with transition carburetors, turn the pilot screws all the way in. This will ensure good idling and smooth running. The air screw setting is the same as the air screw type carburetors.
Pilot screw- Turn all the way in
Air screw- 2 +/- 1/4 turns out.
Direct from Kawasaki.

I have another question. My petcock has a vacuum line that should go on it. The bike is a 79, however the carbs appear to be 77-78 with pilot and air screws. Didn't the vacuum assist come out in 79? If so where do I run the vacuum line to the carbs being they are an older set? Will the bike run without vacuum hooked up? The bike has been sitting for 8 yrs. and I guess I left it somewhat apart. These are my carbs, I found a link off of WG's site. 97.5 main, 15 pilots. Except I don't have the extra vacuum line on the #3 carb.
Forum post


RonKZ650 wrote:

Kawasaki Service 4/600-11, 10/21/77

Recently the carburetors of the KZ650 were changed from the pilot screw type to the air screw type. During the transition from one carburetor type to the other, several hundred units were equiped with carburetors that had both air and pilot screws.
Units with transition carbs:
1977 KZ650B Frame # KZ650B024641-026991
1977 KZ650C Frame # KZ650C007751-010000
1978 KZ650B Frame # KZ650B027901-028701
Dealer action:
When you tune a unit with transition carburetors, turn the pilot screws all the way in. This will ensure good idling and smooth running. The air screw setting is the same as the air screw type carburetors.
Pilot screw- Turn all the way in
Air screw- 2 +/- 1/4 turns out.
Direct from Kawasaki.

Post edited by: vach, at: 2007/04/28 23:14

Post edited by: vach, at: 2007/04/28 23:15

Post edited by: N0NB, at: 2007/05/12 08:34

The real mystery is what is on the Lincoln, NE built bikes--the ones where the frame number begins with 5. Those numbers don't seem to track in the Japanese frame number sequence and the service manual I have makes no mention of them. Yet, I have a Lincoln built 650B3 with a set of pilot screw carbs. My assumption is that they were changed out somewhere along the line, but I am not so sure.

I wonder if Lincoln just put parts together as they got them.

vach wrote:

I have another question. My petcock has a vacuum line that should go on it. The bike is a 79, however the carbs appear to be 77-78 with pilot and air screws. Didn't the vacuum assist come out in 79? If so where do I run the vacuum line to the carbs being they are an older set? Will the bike run without vacuum hooked up? The bike has been sitting for 8 yrs. and I guess I left it somewhat apart. These are my carbs, I found a link off of WG's site. 97.5 main, 15 pilots. Except I don't have the extra vacuum line on the #3 carb.
Forum post

Ok I don't have a vacuum petcock so I dunno, but I do recall reading in another post that you could hook it up to the carb sync vacuum port on the intake manifold? IIRC the petcock will not work without the vacuum line since the vacuum is what opens it to allow the fuel out. Easy to check if you need it. If it requires vacuum nothing will come out when you turn the petcock on without hooking it up. If you can turn it to PRI or ON and fuel comes out then it is not vacuum operated and you wont have to worry about it. I THINK