Colnago_Man
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| posted on 15/7/08 at 09:56 PM |
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ZX9R only runs on choke
Hi,
Having trouble with my ZX9R B4, I've had it running sweetly in the car before but after taking it out to do some other work it no longer runs
without the choke being out.
I start it from cold with the choke out but after I've let it warm up I cannot take the choke off with it stalling. Also it wont rev without
cutting out, as soon as I try a little throttle it just dies.
I removed the plugs and they were very black and possible wet?
It has also has a dynojet kit fitted.
Any clues please?
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big_wasa
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| posted on 15/7/08 at 10:04 PM |
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air leak ?
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mistergrumpy
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| posted on 15/7/08 at 10:18 PM |
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Mine (c1) was reluctant to tick over without choke until I dynojetted it. I too have similar plugs until I can get it tuned properly. What jets and
needle settings are you running?
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MK9R
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| posted on 16/7/08 at 07:04 AM |
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check the float chambers aren't all gunked up. I had exactly the same when we forst installed the zx9. I've got all the details on my
website, but its disappeared :-(
Cheers Austen
RGB car number 9
www.austengreenway.co.uk
www.automatedtechnologygroup.co.uk
www.trackace.co.uk
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mackei23b
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| posted on 16/7/08 at 07:22 AM |
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Yes, ZX9R carbs are sensitive to dirt / gunk etc according to the biker forums
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r1_pete
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| posted on 16/7/08 at 07:24 AM |
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The 9R carb 'chokes' are really fuel enrichment devices, they don't choke the venturi as in say a downdraught weber.
That said it sounds as though the main and / or pilot jets have got gunked up during the engines lay off, and using the choke richens the mixture up
enough to allow the engine to run.
A carb strip and clean out should be 1st on your list of jobs.
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carpmart
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| posted on 16/7/08 at 08:12 AM |
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As already stated, I would start with a strip cleaning all the carbs!
You only live once - make the most of it!
Radical Clubsport, Kwaker motor
'94 MX5 MK1, 1.8
F10 M5 - 600bhp Daily Hack 
Range Rover Sport - Wife's Car
Mercedes A class - Son's Car
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BenB
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| posted on 16/7/08 at 10:24 AM |
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Hang on a minute.....
Something's wonky here (or maybe just my logic!)...
If the plugs are sooted it indicates it running really rich. But.... the engine will only run if the chokes is out (ie even more fuel).
why would an engine that previously ran okay only now run when ridiculously rich??
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Colnago_Man
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| posted on 16/7/08 at 11:33 AM |
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Benb,
Your right its a bit confusing, wondering if the plugs are wet/black because I've only ran it on fully choke for the last few
'testing' runs. It needs to be rich to run but the choke has made it too rich and foweled the plugs.
But you all correct I should clean the carbs first and see what happends. It was a job I was trying to avoid but I know it makes sense now....of to
Halfords for some carb cleaner then!
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