Hi folks got a bit of a problem on my 98 fazer 600 with 40000 miles on it....its developed a misfire when warm over last couple of weeks but bear in mind I can only get out on it on weekend for an hour or two and its kept outside under cover....now when I start it on full chock it struggles abit but starts and the first time it happened it sounded like a diesel so I touched the downpipes and no2 was warm so I took caps off n refitted them and it ran fine then last week went out on it Friday and Saturday only slight misfire at low revs ok over 3.5k but went out Sunday it was a right bag of nails and touched pipes again and no3 was warm so I put new plugs in today and it really struggled to start but when I did it was really smooth till it warmed up then slightly missing again but I had to out so couldn't do anymore.... Any suggestions thanks
Gaz
Fazer 600 98
Bump anyone
Gaz
Fazer 600 98
give carbs a clean and take it for a real ride, give it some beans
I drained down the carbs and put full bottle of redex in a couple of litres of fuel and run it again then again after changing plugs then just been out to test the battery with a multimeter n thats ok n when it was chugging away if felt the pipe and i could hold no4 but others were red hot couldnt touch them im wondering now coilpacks and leads???
Fazer 600 98
is it sparking ok?
just flushing carbs may not fix the problem, but it may well just need to see the redline.
my fzs was sat up for a few weeks recently and only ran on 2 cylinders it needed a bit of throttle to sort it and it has been fine ever since.
Dont know if it means anything but there is a slight backfire/popping noise but it has got a race can on
Gaz
Fazer 600 98
[color=rgb(17, 17, 17)][size=19px !important]Profi Fuel Max - Fuel system & carburetor cleaner[/size][size=21px !important][/size]Great product. Purchased for my Yamaha FZS 600 Fazer (1999). It had been running very roughly (low revs, inconsistent tickover, low speed running, hesitation etc) since purchase in the spring of 2014. Did all the usual stuff - new plugs, checked plug caps,coils etc (all within spec) even purchased new TPS (ouch!) but problem remained. It was during a conversation with a mechanic that I found out that regular unleaded petrol had up to 10% Ethanol in it. Apparently it goes off after a month and leaves a residue particularly in the pilot jets (hence the poor low speed running). The bike was due to go into the garage for a carb cleaning session (about 2 hours labour ~£100). Read about Profi fuel so decided to give it a try. Took a third of the can (90mls) to the garage and filled up with Shell Vmax (less ethanol content) and filled the tank. Pleasantly surprised - running really well after 20 miles; by 50 miles engine is as sweet as a nut! Perfect low speed running, no hesitation and constant tickover. This product also stops the water content in the fuel rusting the tank during winter storage. If you are laying up your bike for the winter its probably better to drain the tank and run the carbs dry and fill up with fresh fuel next Spring. In summary - if you are experiencing poor running give this product a try first, rather than last - you could save a great deal of cash on unnecessary parts and labour costs.[/size][size=21px !important][/color]
Wait until it's pitch black & not pissing with rain.
Have some paience & start up the bike and look at the top of the leads where they go into the plugs........look for very small, arcing lightning bolts, take a while to sit and look or even ask someone else to look from the other side at the same time.
If you've been pulling plugs on and off then id also make sure that the leads and caps are screwed into each other and not just squashed up making a crap contact.
If you see any arcing then snip off the ends of the leads where the arcing is and screwback to the caps, the arcing might occur at the same time as a subtle change in the revs.
Worth a check anyway.
Easiest way to go fast........don't buy a blue bike
16-02-15, 08:56 PM
(This post was last modified: 01-03-15, 12:06 AM by unfazed.)
Take the plug caps off the plugs, pull off the plug caps. Cut a half inch off the ends of the leads, now with the boots rolled back screw the leads back on the cap. Fill the top of the plug cap around the lead with vaseline, push the boots back on. Put the caps back on the plugs As long as there is no corrosion in the cap that should sort it.
Did it to mine a few years ago, never had a problem since.
(16-02-15, 07:42 PM)Rev Chris link Wrote:[color=rgb(17, 17, 17)][size=19px !important]Profi Fuel Max - Fuel system & carburetor cleaner[/size][size=21px !important][/size]Great product. Purchased for my Yamaha FZS 600 Fazer (1999). It had been running very roughly (low revs, inconsistent tickover, low speed running, hesitation etc) since purchase in the spring of 2014. Did all the usual stuff - new plugs, checked plug caps,coils etc (all within spec) even purchased new TPS (ouch!) but problem remained. It was during a conversation with a mechanic that I found out that regular unleaded petrol had up to 10% Ethanol in it. Apparently it goes off after a month and leaves a residue particularly in the pilot jets (hence the poor low speed running). The bike was due to go into the garage for a carb cleaning session (about 2 hours labour ~£100). Read about Profi fuel so decided to give it a try. Took a third of the can (90mls) to the garage and filled up with Shell Vmax (less ethanol content) and filled the tank. Pleasantly surprised - running really well after 20 miles; by 50 miles engine is as sweet as a nut! Perfect low speed running, no hesitation and constant tickover. This product also stops the water content in the fuel rusting the tank during winter storage. If you are laying up your bike for the winter its probably better to drain the tank and run the carbs dry and fill up with fresh fuel next Spring.
In summary - if you are experiencing poor running give this product a try first, rather than last - you could save a great deal of cash on unnecessary parts and labour costs.[/size][size=21px !important][/color]
Hi m8 thanks for that but the only fuel I use is esso premium as it apparently got no ethanol so no moisture build up as I don't use it everyday but I will look into that stuff ta m8
Gaz
Fazer 600 98
Does anyone know where i can get this stuff from uk although i do wanna give it a try. But although im no expert or mechanic but i dont think its fuel more electrical as every time it misses its a different cylinder each time
Gaz
Fazer 600 98
Looking at these plug cap arnt oem as these are straight not 45° bends so the lead bit coming out of the cap is always bent so im hoping that is the problem and going to bike shop tomorrow and getting 1.5 metres of lead and 4 new caps hopefully 45° bends
Gaz
Fazer 600 98
(17-02-15, 05:32 PM)wildchild74 link Wrote:Looking at these plug cap arnt oem as these are straight not 45° bends so the lead bit coming out of the cap is always bent so im hoping that is the problem and going to bike shop tomorrow and getting 1.5 metres of lead and 4 new caps hopefully 45° bends
Gaz
If you try what me & unfazed suggest above then it might save you the bother.
Just unscrew the lead from each cap &snip off the ends....i dunno maybe 10-15mm, screw the lead back to the cap & see if it makes a difference. Nothing to lose if it doesnt work but if it does then at least you know.
Easiest way to go fast........don't buy a blue bike
Noggy, we can only suggest, if they wish to spend money first???? 
Considering the fact you cannot remove the leads from the coils I am not sure what he is thinking of doing. :rolleyes
The straight NGK are the usual replacement, but the same issue applies as with the original caps, the leads loosen :eek
(17-02-15, 07:11 PM)unfazed link Wrote:Noggy, we can only suggest, if they wish to spend money first????
Considering the fact you cannot remove the leads from the coils I am not sure what he is thinking of doing. :rolleyes
The straight NGK are the usual replacement, but the same issue applies as with the original caps, the leads loosen :eek
I actually dont know much but i learn every year & i remember having a similar problem & an old wise foccer (red98) suggesting the same.
Right enough it was arcing and i did the trimming the leads & hey presto quite satisfying.
Easiest way to go fast........don't buy a blue bike
Lol.....well iam old so your half right noggy :lol.......yes, as suggested check the plug caps/leads in the dark, look out for sparks jumping across from plug caps/leads to engine , leads can go hard and brittle with age and are sealed to the coils so trimming the ends to get a good connection is the best solution and if wont cost you anything....a good place to start 
One, is never going to be enough.....
(17-02-15, 06:59 PM)noggythenog link Wrote:[quote author=wildchild74 link=topic=15991.msg183865#msg183865 date=1424190738]
Looking at these plug cap arnt oem as these are straight not 45° bends so the lead bit coming out of the cap is always bent so im hoping that is the problem and going to bike shop tomorrow and getting 1.5 metres of lead and 4 new caps hopefully 45° bends
Gaz
If you try what me & unfazed suggest above then it might save you the bother.
Just unscrew the lead from each cap &snip off the ends....i dunno maybe 10-15mm, screw the lead back to the cap & see if it makes a difference. Nothing to lose if it doesnt work but if it does then at least you know.
[/quote]
Thanks lads i will try that tomorrow... and i just thought they may be cheap replacements and the chap in the bike shop told me that i could put new leads into coils but as i said im no expert or mechanics but i am a quick learner but once again thanks for all your input
Gaz
Fazer 600 98
(16-02-15, 06:37 PM)wildchild74 link Wrote:Dont know if it means anything but there is a slight backfire/popping noise but it has got a race can on
Gaz
Since the fuel going to cylinder 4 isn't getting burnt in the cylinder it is burning when it meets the hot gases from the other cylinders where the pipes join giving the backfire/popping noises.
Have you tried swapping the spark plug from cylinder 4 to another cylinder to check it's not just a duff plug?
Hi folks just a little update tried trimming leads...no change so i won oem coils n leads on ebay came today and fitted them.....missing all over the shop so took them of 1 by 1 and screwed leads in to the caps fired it up n no misfire at all took it out for 10 mins and all it does now is when coming down the gears it sounds like theres a slight misfire but to be honest carbs prob need balancing and its still running the additive thru so not worried about at the mo so thanks for all your input lads
Gaz
Fazer 600 98
23-02-15, 08:05 PM
(This post was last modified: 23-02-15, 08:05 PM by unfazed.)
It mostly likely that the cap internals are corroded or the carbon resistor in the cap has gone higher resistance.
Out of curiosity and if you have time, remove the old caps and looking into to them, you will see a slot for a screwdriver. Unscrew it and out will fall, the piece you unscrewed, a carbon resistor, a tiny brass washer and a spring. A very high possibility that there is corrosion in there somewhere and if not the resistor is knackered. :eek
I have swapped the resistors with the 5Kohm resistors ones from old NGK spark plugs, (these are wire wound and more reliable) cleaned up the corrosion on the spring and the internal part of the cap, dumped the tiny washer (they break half the time). Requires a bit more pressure to reinstall as the NGK resistor is a little longer than the carbon one. Put them all back together and works fine. :thumbup
Have not heard of a fazer coil pack up yet.
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