Z1OwnersClub GB

HI Guys. New here.
Coming to the end of rebulding my 76 Z900.
The carbs were a bit ropey so I had a skulk around Ebay and turned up a full set in Calfornia. On arrival they are like new and most likely never been taken apart. However there are some differences and I am not 100% sure what I have.
First the idle adjustment screw comes out below the float bowls.
The bores measure 29mm. Float bowl drains are the small side mounted screw type. Jets are....
Needles 5CN15
Primaries 15
Mains 117.5

Anyone have any idea what I have here?
I can post some pic's if that will help.

Hi and welcome.
A picture would be a big help.
If they are 29mm they could be smoothbores if so they should have a 17mm drain bolt on the bottom of the float bowl.

VM28mm carb I had and they had the extra mixture screw below floatbowl on engine side


29mm smoothbore, note small rectangular casting on the side just above floatbowl and right of centre, only on smoothbores

useful link to Z1 enterprises carb id page
http://www.z1enterprises.com/Z1CarbGuide.aspx

1978 z1r are 28mm (which might measure 28-29 at the mouth) They have
5cn15 needles
15 pilots

107.5 std mains

So they could be Z1IR'S

kawasaki z1000 e1/st









rt # Description Price Qty
1 16005-027 TOP,MIXING CHAMBER Not Available
2 220AA0414 SCREW-PAN-CROS,4X14 $2.03
3 461F0400 WASHER SPRING 4MM $1.13
4 223AA0414 SCREW-PAN-WS-CROS,4X14 $1.13
5 16019-031 GASKET,CHAMBER TOP $16.33
6 16003-013 NUT,5MM $4.83
6 312AA0500 NUT-HEX,5MM $1.13
7 461DA0500 WASHER-SPRING $1.13
8 16039-016 WASHER,PLAIN Not Available
9 16046-012 SCREW,SLOTTED Not Available
10 16057-002 SEAT,SPRING Not Available
11 16040-026 SPRING Not Available
12 16067-006 BOLT,HEX HEAD,5X14 $9.67
13 39075-1001 LEVER,THROTTLE Not Available
14 16033-031 SCREW,PAN HEAD,3X14 Not Available
15 11034-1238 BRACKET,THROTTLE VLV Not Available
16 16008-010 CIRCLIP $4.41
17 16009-1032 JET NEEDLE,5CN17 | KZ1000 Not Available
17 16009-1046 JET NEEDLE,5CN29 | KZ1000 Not Available
18 16025-1026 VALVE,THROTTLE,CA2.0 Not Available
19 16076-003 CIRCLIP Not Available
20 16073-014 COLLAR Not Available
21 16039-015 CAP,STARTER PLUNGER $3.62
22 16012-015 CAP,STARTER PLUNGER Not Available
23 670B1509 in.Oin. RING,9MM $1.86
24 16013-008 SPRING,STARTER PLUG $3.90
25 16016-021 PLUNGER,STARTER Not Available
26 16017-1035 NEEDLE JET,AO-4 Not Available
27 49122-1001 PIPE,BLEED Not Available
29 92063-1038 MAIN JET,#110R $7.81
29 92063-073 JET-MAIN NO 107.5R | RACING USE ONLY $7.81
29 92063-1042 MAIN JET,#A105R | RACING USE ONLY $7.81
29 92063-1110 JET-MAIN,#A112.5 | RACING USE ONLY $8.02
29 92063-1109 JET-MAIN,#A115 | RACING USE ONLY $8.02
30 16022-007 SPRING-THR STOP SCREW $4.64
31 16014-1004 SCREW,PILOT ADJUSTING | KZ1000-E1 Not Available
31-1 16014-1020 SCREW,PILOT ADJUSTING | KZ1000-E2 $9.02
32 16038-022 in.Oin. RING | KZ1000-E1 $3.42
33 16029-004 WASHER FLOAT VLV SEAT $2.37
34 16030-027 FLOAT VALVE ASSY $45.91
35 92064-1017 PILOT JET,#A15 $15.70
36 16031-031 FLOAT $64.89
37 16032-008 PIN,FLOAT $3.62
38 11009-1562 GASKET,FLOAT CHAMBER $9.36
39 220AA0416 SCREW-PAN-CROS,4X16 $1.13
40 461F0400 WASHER SPRING 4MM $1.13
41 16049-007 SCREW,GUIDE Not Available
42 92027-1103 RING,JET NEEDLE $3.90
43 92081-1072 SPRING,JET NEEDLE $2.72
44 13169-1107 PLATE,JET NEEDLE Not Available
45 92022-1024 WASHER,THROTTLE VALVE $3.42
46 92055-1059 in.Oin. RING,CHECK VALVE $5.36
47 92037-1123 CLAMP,SPRING,CHECK VL $4.11
48 13042-1004 WEIGHT,PUMP,CHECK VLV Not Available
49 92140-1003 BALL,STEEL,CHECK VALV $4.11
50 92066-1051 PLUG,PILOT SCREW | KZ1000-E2 $2.72

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Most of the Z carbs (I think this still applies to the Z9) will have an ID number stamped on the inlet flange where they bolt on. That should tell you exactly what you have?

No little square on the float bowl so I guess VM28s. The mixture screw is as Z1bman's post but no pump jet.

Can anyone give me advice on the jetting? I am running a standard air filter set up and a Vance & Hines 4-1. Engine is stock apart from the ports being cleaned up.

Thanks for the speedy replies :-))))

117'S wont be a million miles out two or three jet sizes up for a 4-1 (if it is fairly straight through) should be about right.

I would try 112.5 /115 's if I had them otherwise stick them on and see what its like and buy some more if you need them.

Keefleaf wrote:Hi and welcome.
A picture would be a big help.
If they are 29mm they could be smoothbores if so they should have a 17mm drain bolt on the bottom of the float bowl.

Not all 29 smoothbores have the big drain screws,you can use the style with angled drains that look like vm 26-28 style also which came on early smoothbores.