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Z1000 No longer starting after carbs replaced.
Moderators: KeithZ1R, chrisu, paul doran, Taffus
Z1000 No longer starting after carbs replaced.
Hi All. I recently replaced my Z1000's GSXR1100K carbs (it ran great with these why did I bother with bloody 30 year old carbs!! with 'more period' VM29 MM smoothbores, bought from the adverts in here. I rebuilt the smoothbores with over £200 of new parts from Allens Performance (on their advice with all parts that might cause problems), float valve assemblies, needle jets, drain screws, main jets, venturi Blocks, gaskets etc etc.
I started the bike up yesterday and it seemed to run OK (if a bit rough as I'd only statically balanced the carbs, but it idled ok and seemed pretty much fit for a first run). No fuel leaks, just a bit of backfiring which tightening up the inlet rubbers etc and a bit of tweaking of the pilot jets etc seemed to cure. Started and stopped it loads of times yesterday and all seemed OK, this was obviously prior to fully balancing the carbs.
After fully charging the battery last night with an Optimate I went out and tried to start the bike again today and it was like a completely different bike, just wouldn't start, chugging and backfiring like hell, and when it did start it only ran on cylinders one and two, three and four stone cold.
Checked spark (Dyna ignition) and all plugs were sparking OK so not a coil or ignition problem (so I thought).
Checked the fuel, checked tank tap and removed drain plugs and fuel was reaching each carb.
One drain plug had dodgy threads and will now no longer seat tightly so this will need to be replaced, but wasn't leaking previously.
It turns over fine, just wont fire worth a damn.
Have I a shim / valve problem?
I did replace some shims a while back and as said the bike was running fine yesterday after numerous start / stop sessions?
I'm at a loss unless something is preventing the fuel reaching number one and two cylinders.
Help!!!
John
I started the bike up yesterday and it seemed to run OK (if a bit rough as I'd only statically balanced the carbs, but it idled ok and seemed pretty much fit for a first run). No fuel leaks, just a bit of backfiring which tightening up the inlet rubbers etc and a bit of tweaking of the pilot jets etc seemed to cure. Started and stopped it loads of times yesterday and all seemed OK, this was obviously prior to fully balancing the carbs.
After fully charging the battery last night with an Optimate I went out and tried to start the bike again today and it was like a completely different bike, just wouldn't start, chugging and backfiring like hell, and when it did start it only ran on cylinders one and two, three and four stone cold.
Checked spark (Dyna ignition) and all plugs were sparking OK so not a coil or ignition problem (so I thought).
Checked the fuel, checked tank tap and removed drain plugs and fuel was reaching each carb.
One drain plug had dodgy threads and will now no longer seat tightly so this will need to be replaced, but wasn't leaking previously.
It turns over fine, just wont fire worth a damn.
Have I a shim / valve problem?
I did replace some shims a while back and as said the bike was running fine yesterday after numerous start / stop sessions?
I'm at a loss unless something is preventing the fuel reaching number one and two cylinders.
Help!!!
John
Last edited by JohnC on Mon May 27, 2013 3:16 pm, edited 2 times in total.
Update: Just had another look. I took the tank off earlier but I never noticed this. Both coils are red hot when touched, and this is with the ignition switched off!!!. The coil on the right hand side of the bike is cracked (Dyna) around the middle, so I'm guessing this is NOT GOOD!!! Even though the spark plugs seemed to be firing OK.
Is this some sort of major shorting problem elsewhere? Or just the result of a duff coil. Dyna coils seem to hate me as I've had a couple of failed Dyna coils in the past.....
I also noticed the rectifier / regulator was a bit loose, if this makes any difference. Or, could my regulator have failed and my bike is over charging?
John
Is this some sort of major shorting problem elsewhere? Or just the result of a duff coil. Dyna coils seem to hate me as I've had a couple of failed Dyna coils in the past.....
I also noticed the rectifier / regulator was a bit loose, if this makes any difference. Or, could my regulator have failed and my bike is over charging?
John
Last edited by JohnC on Mon May 27, 2013 3:45 pm, edited 3 times in total.
Does this make sense to anyone? I did disconnect each plug to check for a spark grounding each one against the engine
http://www.kzrider.com/forum/4-electric ... e-question
Or:
http://www.kzrider.com/forum/4-electric ... 0&start=20
http://www.kzrider.com/forum/4-electric ... e-question
Or:
http://www.kzrider.com/forum/4-electric ... 0&start=20
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- Chunks
- Posts: 568
- Joined: 29th Jan 2008
- Location: milton keynes
if the plugs are wet it is obvious the spark is not good enough to ignite the fuel. once you have it running put your meter test leads across the battery terminals + rev the engine to about 4/5 thousand revs you should have about 14 volts at the battery any more than 14.6 volts indicates a faulty regulator / rectifier
Cheers m8, I've ordered up up some new coils so hopefully (possibly the wrong term!) all I've done is -palm face moment - left the ignition on and nothing else is amiss. A bloody expensive mistake at £130 for new ones :/
I've checked the coils again today with no ignition on and they are not heating up plus the meter isn't showing anything amiss as far as I can tell.
Oh well
I've checked the coils again today with no ignition on and they are not heating up plus the meter isn't showing anything amiss as far as I can tell.
Oh well