fazer 600 2001 misfire

[bucksfiz]

misfire on no 4   and slight one on no 3 tryed several plugs tryed coils tryed caps  still no good anyone got any ideas cheers boys

[red98]

if you have a nice big fat spark at the plugs i would start looking at the carbs  ....what colour are the plugs ?

[bucksfiz]

no 4 plug is still like new no change of colour when i pull the lead off with it running nothing happens and no 3 only a very slight drop in rpm   1& 2 leads off seperatly and the rpm drops right down to engine nearly cutting out so 3 not working fully and 4 pot nothing at all plug still stays like new  done a compession check and all 120

[69oldskool]

Drain carbs, maybe you've water in the float bowls?,i've had this on bikes before.
Worth a try.

[red98]

have you checked for a spark ?

[WookieoToole]

swap coils over that will tell u if coil pack is naff

[bucksfiz]

swapped coils and put a new one on  and yes we have a good spark????????????????????    anyone got a rope doing my head in now   did undo drain plug on no 4 carb but only let a bit out just to see if there was petrol in there   thks for all the replies so far but still not sorted

[bucksfiz]

drained carbs still no good

[Fazerider]

If you've a spark and compression that only leaves fuel as the problem. Either the level or possibly a blocked jet.
Are you using choke? Does the cylinder chime in at higher revs or when warm? (Might help pinpoint a cause to the choke or pilot).

[bucksfiz]

its like it hot or cold     ive taken the carbs off stripped em down cleaned the jets found no think    still doing me head in

[Fazerider]

Are you sure the spark leads are connected in the right order? Just wondering if 3 and 4 are swapped.

[red98]

good thinking FAZERIDER ,has this come on all of a sudden,have you done any other work on the bike recently ?

[ade the blade]

good thinking FAZERIDER ,has this come on all of a sudden,have you done any other work on the bike recently ?

wot?..like fitted a new horn or tank cover? sowwy !!

[bucksfiz]

no resent work carried out just developed misfire  bike only gets used occationly cant spell that one    and only has 9000 mls from new

[bucksfiz]

Are you sure the spark leads are connected in the right order? Just wondering if 3 and 4 are swapped.

     
 
 
yes according to the numbers on the leads   4 on the far outside right hand side as u sit on it

[red98]

Are you sure the spark leads are connected in the right order? Just wondering if 3 and 4 are swapped.

     
 
 
yes according to the numbers on the leads   4 on the far outside right hand side as u sit on it

are all the other leads in the right position ?    iam sure you have already checked but got to ask 

[bucksfiz]

Are you sure the spark leads are connected in the right order? Just wondering if 3 and 4 are swapped.

     
 
 
yes according to the numbers on the leads   4 on the far outside right hand side as u sit on it

yes all the same as theyve been since new



are all the other leads in the right position ?    iam sure you have already checked but got to ask 

[bucksfiz]

update:  put carbs back on and still misfiring on 4  and slightly on 3     so i connected a 3 foot piece of petrol pipe to the balance pipe on the rubber carb mounts on no 4 and with engine running poured petrol down 3 foot tube and ha presto she reeved up    so what now??????????????   carbs all cleaned  bubbers not leaking or sucking in air        gotta buy some rope or a box of matches  its about to go in the thames

[red98]

oh no not the thames  .......got to be blockage in the carb,did you remove the jets to clean ? also check the float height 

[Dead Eye]

This could be completely retarded but; could the butterfly be sticking closed?

[bucksfiz]

oh no not the thames  .......got to be blockage in the carb,did you remove the jets to clean ? also check the float height 

it wont float in the thames!!!!!!        yes removed the jets found no crud but still cleaned them all    didnt check float height as how can that ever get changed and never found that to be a problem in 37 years of carrer   waiting for high tide now

[bucksfiz]

This could be completely retarded but; could the butterfly be sticking closed?

i thought that but no they all open in sync

[Dead Eye]

Yeah, I believe they do, but for some reason you aren't getting fuel in to no 4 cylinder. If the jets have been cleaned and the floats are fine (agree that its unlikely to be the float height) then that leaves the butterfly or a blockage in the carb rubbers (either side potentially)

[red98]

sticking float,blocked/stuck float valve  ? 

[ade the blade]

sticking float,blocked/stuck float valve  ? 

as above........to recap then, not leccy fault as carbs 3 and 4 have differing amounts of misfire ( both these plugs are `fired `by separate coils ) so chances of both faulty at same time are pretty slim. shit running when `fueled ` in normal manner but revs lovely when fuel is added bypassing carb ( vacuum nipple  )= internal carb issue.......and so we return to Red`s suggestion !! good luck. said it before, sit down with a cuppa ( and possibly a ciggy ) and just think it through. don`t start ripping things apart willy nilly. you know it`s a `fuelling` issue so keep solely in that area