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Bikes, Hints'n'Tips => FZS600 Fazer => Topic started by: bucksfiz on 24 May 2013, 12:28:54 am
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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
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if you have a nice big fat spark at the plugs i would start looking at the carbs ;) ....what colour are the plugs ?
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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
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Drain carbs, maybe you've water in the float bowls?,i've had this on bikes before.
Worth a try.
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have you checked for a spark ? ;)
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swap coils over that will tell u if coil pack is naff
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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
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drained carbs still no good
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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).
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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
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Are you sure the spark leads are connected in the right order? Just wondering if 3 and 4 are swapped.
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good thinking FAZERIDER ,has this come on all of a sudden,have you done any other work on the bike recently ?
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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 !! :rolleyes :lol :lol :lol :lol
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no resent work carried out just developed misfire bike only gets used occationly cant spell that one and only has 9000 mls from new
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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
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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 ;)
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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 ;)
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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
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oh no not the thames :eek .......got to be blockage in the carb,did you remove the jets to clean ? also check the float height ;)
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This could be completely retarded but; could the butterfly be sticking closed?
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oh no not the thames :eek .......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
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This could be completely retarded but; could the butterfly be sticking closed?
i thought that but no they all open in sync
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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)
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sticking float,blocked/stuck float valve ? ;)
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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 :rolleyes )= 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 ;)
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will rip carbs off again when i get a chance and give em another good clean then report back cheers so far boys for all your help very much appreciated
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If you prime up the carbs, ign on wait for fuel pump to stop clicking just before you remove them and then keep them verticle, remove the bowl of dodgy no4 and a good one and compare the fuel levels between them. If you loose any fuel out of them getting them out just top them up again out of the frame.
This is better than just a "float level" check, as that don't prove the needle valve is not bloked or other no fuel flow problem / blockage, stuck float as mentioned possible
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A quicker and less messy method of checking the fuel levels in the carbs is to use a length of pvc tubing on the drain spigot as described in the manual. By draining the bowl first (may need to turn off the fuel tap under the tank briefly) you can compare the filling rates for a good carb and carbs 3 and 4. That way you can find out if the problem is in the fuel supply side without even taking the carbs off.
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A quicker and less messy method of checking the fuel levels in the carbs is to use a length of pvc tubing on the drain spigot as described in the manual. By draining the bowl first (may need to turn off the fuel tap under the tank briefly) you can compare the filling rates for a good carb and carbs 3 and 4. That way you can find out if the problem is in the fuel supply side without even taking the carbs off.
:agree yep...thats the way i do it.......i would check that first but its more likley to be the float valve ;) [size=78%] [/size]
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at last shes sorted it,s in the thames only joking before u go looking firstly sincere thanks to all for your inputs, helped imencly many many thanks took the carbs off and gave the another good strip down and blew the fook out of em and that cured it shes as good as new cheers boys many thanks.
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nice one matey.....did you see what was causing the blockage or was it just a general clean and blast with the airline ?.......glad its sorted :)
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nice one matey.....did you see what was causing the blockage or was it just a general clean and blast with the airline ?.......glad its sorted :)
hi m8 when i striped carbs first time they were still like new and found no s-it in them did not use a compresor first time as i dont like blowing 100+ psi,s around esspecally when they still looked like new as usually with my luck something important usually gets blown accross the other side of the workshop and losted many thanks for your help cheers kind regards gaz
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ha ha....yeh, know what you mean about losing things with an air line,done that a few times,you mention the thames a few times are you at the london end ? if yes your more than welcome to join in with our "london foccers monthly ride-outs " :)
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yes near the 02 whens the next ride out and where
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The next ride out, is today :D Leaving from the Ace Cafe at around 8.30am
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Wow! Ur up. Seeya 7:45