Guest Posted December 22, 2013 Posted December 22, 2013 hi, I am doing up my zx7r , after being left for a couple of months I have gone to fire her up after putting fresh fuel in. she starts up with chock on full but only on three cylinders, I left bike to run up to temp and fan kicks in fine but still only on three and when u nock chock off it dies, what could be the problem and how do I fix it cheaply. Quote
Tango Posted December 22, 2013 Posted December 22, 2013 Welcome to TMBF mate.......pop over to the Newbies section and introduce yourself to the guys when you can...... Sounds like a plug/HT lead problem to me.......check the plugs and leads. There's a few with ZX7R's on here....so I'm sure they will be able to give you some more specific advice when they're around...... Quote
Stu Posted December 22, 2013 Posted December 22, 2013 I would whip the plug out and have a look at it if it's soaked on fuel then you are getting fuel to it If it's bone dry it could be a stuck float or blocked jet in the carb If it's wet with fuel you need to dry it out then check for a spark if no spark then check all the leads and wiring Not sure of the are 2 or 4 coils on these if it's 2 then it won't be a coil problem as the other plug that's connected is working If it's 4 coils so the coil with another to verify it's working Quote
Mr Fro Posted December 23, 2013 Posted December 23, 2013 It's waste spark so 2 coils Stu. OP - the HT leads should be numbered so try swapping them around, 1&3 and 2&4 to see if that helps out.Did you check your plugs yet? Quote
megawatt Posted December 23, 2013 Posted December 23, 2013 If plug isn't wet, could be a blocked carb jet? Quote
eastanglianbiker Posted January 4, 2014 Posted January 4, 2014 If plug isn't wet, could be a blocked carb jet? was going to say look for the dry plug and chances are it will be number one or number 4 numberone due to old fuel blocking up jet or number 4 due to lack of fuel allowing flaky crap off bottom of float bowl to lift from carb being dry due to leaning on side stand for a while Quote
Guest Posted January 4, 2014 Posted January 4, 2014 got a 1996 zx7r put 4 new plugs in bike runs but only on 2 cylinders. when checking down pipes to see if warm the 2 pipesto the right when sat on bike are clap cold. what could it be to fix this so is running on all 4 again? carbs blocked? carb cleaner? or something else? please help Quote
Tango Posted January 4, 2014 Posted January 4, 2014 Check which coil(s) those plugs come from......could be that one of the coils has died.......swap the coils over and see if the problem switches to the other cylinders..... Other than that, it could be clogged jets or float bowls not filling on the carbs for those 2 cylinders.... Quote
Guest Posted January 4, 2014 Posted January 4, 2014 Check which coil(s) those plugs come from......could be that one of the coils has died.......swap the coils over and see if the problem switches to the other cylinders..... Other than that, it could be clogged jets or float bowls not filling on the carbs for those 2 cylinders.... I have checked all for plugs for a good spark be for fitting , all was fine so does this rule out coils Quote
Tango Posted January 4, 2014 Posted January 4, 2014 Yeah....if you've got a good spark at all plugs then the coils should be OK...... In which case it sounds like a fuelling issue......so the carbs could probably do with a strip, inspect and clean...... Just make sure you have compression on those cylinders too.......just pull the plugs out and stick a finger in the plug hole and turn the motor over.....should be enough puff there to blow your finger off the hole.... Quote
Guest Posted January 4, 2014 Posted January 4, 2014 Check which coil(s) those plugs come from......could be that one of the coils has died.......swap the coils over and see if the problem switches to the other cylinders..... Other than that, it could be clogged jets or float bowls not filling on the carbs for those 2 cylinders.... I have checked all for plugs for a good spark be for fitting , all was fine so does this rule out coils cheers will try some carb cleaner tomorrow Quote
Guest Posted January 5, 2014 Posted January 5, 2014 Check which coil(s) those plugs come from......could be that one of the coils has died.......swap the coils over and see if the problem switches to the other cylinders..... Other than that, it could be clogged jets or float bowls not filling on the carbs for those 2 cylinders.... I have checked all for plugs for a good spark be for fitting , all was fine so does this rule out coils cheers will try some carb cleaner tomorrow tried carb cleaner to day and still no joy, any ideas ? Quote
Tango Posted January 5, 2014 Posted January 5, 2014 If you pull the plugs out from the non-firing cylinders are they wet?......if they are, then it's a sparking/compression issue.....if the plugs are dry then you've still go a problem with the carbs......could be well and truly blocked jets that the carb cleaner can't shift..... Quote
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