SJ
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| posted on 10/7/15 at 12:07 PM |
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Sorry if this is an obvious point but have you balanced the carbs?
Stu
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aka Keith
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| posted on 10/7/15 at 12:19 PM |
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quote:
Originally posted by SJ
Sorry if this is an obvious point but have you balanced the carbs?
Stu
Stu, I balanced them last night when it was idling on all 4.
Will put the balancer back on them, and see if it makes any difference.
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dave_424
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| posted on 10/7/15 at 12:22 PM |
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You did put the blanking plugs/vac pipes on the ports in the head for balancing? are they sealed well with their aluminium washers?
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aka Keith
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| posted on 10/7/15 at 12:45 PM |
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quote:
Originally posted by dave_424
You did put the blanking plugs/vac pipes on the ports in the head for balancing? are they sealed well with their aluminium washers?
yip, the pipes between 1 & 4 and 2&3 or on their. was the first thing I checked.
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aka Keith
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| posted on 10/7/15 at 01:09 PM |
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right, plugged the balancer in and it was out, so I have now balanced the carbs, all are within 2mm or each other across the balancer. however, the
4th cyclinder is not idling correctly... I have temp reader and 1,2 and3 headers are reading about 240c while the 4th is reading about 140c.
any thoughts
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SJ
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| posted on 10/7/15 at 03:23 PM |
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When I'm setting mine up I normally have to balance them, adjust the idle mixture screws and balance again to get them right.
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GeoffT
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| posted on 10/7/15 at 05:11 PM |
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My 2p worth...
When balancing carbs or t/b's you're trying to get the engine running equally on all four cylinders at tickover.
Irrespective of what the balancer is telling you, if No4 cylinder isn't doing as much work as the other 3 (at tickover) then you need to open
the butterfly slightly on no4 in relation to the other 3.
My method of doing this fine tuning was to pull the injector plugs one by one and adjust till the drop in engine note was exactly the same across all
4 when each injector was pulled. Always worked for me, maybe worth a try...?
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dave_424
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| posted on 10/7/15 at 05:14 PM |
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ZX9 uses carbs
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GeoffT
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| posted on 10/7/15 at 05:16 PM |
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Ok, pull the plug leads instead.
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r1_pete
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| posted on 10/7/15 at 06:53 PM |
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When you had the idle control tangled, was 'actuating' fast idle and masking your problem?
IIRC the zx9 carbs have a T piece in the middle to distribute fuel, is the outlet to 3 & 4 restricted in any way? it could have been enough to
fill no3 but not no4??
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SJ
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| posted on 10/7/15 at 08:21 PM |
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My bet would be a clogged idle jet or gallery. Have you had the idle jets out and looked through them?
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aka Keith
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 posted on 11/7/15 at 08:06 AM |
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sorry for not getting back earlier (broadband went down). the 4th header was running very much cooler so I thought to myself it was running rich,
adjusted the idle jet to lean it out a little and bingo it was working. then started it up and it shot to 5k revs, found that the allen screws to
tighten the carb rubbers to the carbs were moving the throttle adjuster springs.
so far, it appears to be fixed.
in all, cleaned a four carbs at least 3 times
changed coils
did the valve clearances and changed the shims
changed idle jets on 2
moved all carb parts from 2nd cylinder to 4th
changed the fuel hoses
balanced the carbs 4 times
tweaked the idle adjusters
so appears to be running at the moment, but never got down to the actual cause.
oh well you love and learn.
Thanks for all the help and support.
Cheers
Craig
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SJ
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| posted on 11/7/15 at 09:30 AM |
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Well done. When you don't know where to start it can take ages.
I had idle problems initially with ZX6 bike carbs on my Zetec, and for a while I though it was because I had the carbs mounted horizontally, which
some people say doesn't work [I did it like that because it meant I didn't need an expensive fabricated manifold and bits of silicon hose
to attach the carbs]
In the end it just turned out that the float levels were too high and after lowering them it idles perfectly plus I have the benefit of using the
mounting rubbers that Mr Kawasaki designed for the job.
Stu
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