- Posts: 3
- Thank you received: 0
'79 kz400 carb draining
- qool67
- Topic Author
- Offline
- User
1st, how to stop the draining
2nd, why plug a jet?
3rd, best fix?
thanks all
jon
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
- Posts: 18640
- Thank you received: 2098
soon as I turn the fuel on, it comes pouring out of my port (left) carb from the bottom of the bowl - a steady stream.(the drain tube was tied in a knot) Got the bike free, pulled the carbs and they seem clean, just pulled the bowls and made sure the floats weren't stuck. ALSO - the primary jet in both carbs had a machine screw wrapped with plumber's tape shoved up the hole. Primary is the one offset from the center of the carb when held upside down, right?
1st, how to stop the draining
2nd, why plug a jet?
3rd, best fix?
thanks all
jon
Hello Jon! Good to see you on the forum.
Often, incomplete closure of the float needle/seat interface (leaking float needle) allows fuel to keep on coming into the float bowl. The float bowl overflow circuit is designed as an escape route for the excess fuel which passes from a nipple on bottom of the float bowl and on through a tube from the nipple routed around the swing arm to underneath the bike. This may happen regardless of a properly functioning float.
A sticking float may also cause the over flow by failing to push the float needle up into and against its seat. This may happen regardless of an otherwise perfectly sealing float needle/seat interface.
And of course a damaged or worn out float needle and/or seat may fail to seal off the incoming fuel as they are supposed to.
Would here first suspect crud or grit lodged in the float needle/seat interface. Often resolved by a good cleaning.
This is the main reason why it's so important to always use an in-line fuel filter.
ALSO - the primary jet in both carbs had a machine screw wrapped with plumber's tape shoved up the hole.
Sure don't see that very much.
Pic???
Good Luck!
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
- Posts: 18640
- Thank you received: 2098
[Click on image to enlarge view]
REF NUMBER PART NUMBER DESCRIPTION QUANTITY US CA CN REMARKS
1 92009-1004 SCREW,PLUG 2
2 92055-1002 O RING,PILOT ADJ 2
3 92022-1003 WASHER,PLAIN 2
4 92081-1002 SPRING,PIROT ADJ SCRW 2
5 16014-1001 SCREW,PILOT ADJUST 2 X USE FOR 16001-1008/-1097, USE FOR 16001-1112 USA
6 11012-3727 CAP,JET NEEDLE 2
7 16005-1001 TOP,MIXING CHAMBER 2
8 220B0408 SCREW PAN HEAD 4X8 7
9 92081-1001 SPRING 2
10 92037-1005 CIRCLIP 2
11 16007-1001 COLLAR 2
12 16009-1010 JET NEEDLE,003303 2 X USE FOR 16001-1008/-1097, USE FOR 16001-1112 USA
13 16126-1042 VACUUM,VALVE 2
14 16017-1001 NEEDLE JET 2
15 13091-1019 HOLDER,NEEDLE JET 2 X USE FOR 16001-1008/-1097, USE FOR 16001-1112 USA
16 92063-1003 MAIN JET,2ND,#90 2 S.T.D., RACING USE ONLY, RACING USE ONLY, RACING USE ONLY, RACING USE ONLY
17 92062-1001 NOZZLE,MAIN 2
18 92063-1002 MAINJET,PRIMARY,#70 2
19 92064-1001 PILOT JET,#35 2
20 16012-1001 CAP,RUBBER 2
21 16030-1007 FLOAT VALVE 2
22 16044-007 CLIP,FLOAT VALVE 2
23 16031-1001 FLOAT 2
24 92043-1002 FLOAT PIN 2
25 16019-024 "O" RING,FLOAT BALL 2
26 461F0400 WASHER SPRING 4MM 8
27 220B0412 SCREW-PAN-CRSOSS,4X12 8
28 92055-1003 "O" RING,DRAIN SCREW 2 USE FOR 16001-1008
29 92009-1003 SCREW,DRAIN 2 USE FOR 16001-1008
30 92009-1095 SCREW,DRAIN 2 USE FOR 16001-1112/-1097
31 92055-1053 "O" RING,DRAIN SCREW 2 USE FOR 16001-1112/-1097
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.
- qool67
- Topic Author
- Offline
- User
- Posts: 3
- Thank you received: 0
Thanks again,
Jon
Please Log in or Create an account to join the conversation.
- Link14
- Offline
- User
- Posts: 575
- Thank you received: 6
Is the adjustment you mentioned the plug (#20) over the pilot jet? I remember asking Wired George about those and I think he said they're needed to draw the right amount of vacuum through the pilot system and are basically there to provide access to the pilot jet.
Please Log in or Create an account to join the conversation.
- wiredgeorge
- Offline
- User
The correct jets must be used for the assembly to work properly. In addition, the flooding issue... clean the float seats using a q-tip and brasso to ensure they are as clean/smooth as possible, install new float needles and set the float level using the service fuel level method (clear plastic tube next to bowl). This technique is described in a most any service manual and many times on this board.
wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!
Please Log in or Create an account to join the conversation.
- Link14
- Offline
- User
- Posts: 575
- Thank you received: 6
Please Log in or Create an account to join the conversation.
- qool67
- Topic Author
- Offline
- User
- Posts: 3
- Thank you received: 0
jon
Please Log in or Create an account to join the conversation.