Date: 28-03-24  Time: 10:34 am

Author Topic: FZS600 Drive Diagnosis  (Read 3660 times)

Martin11175

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FZS600 Drive Diagnosis
« on: 21 January 2014, 08:52:43 pm »
Good evening ladies and gents,


I'm having some diagnosis issues with my FZS600 Foxeye and thought here would be the most knowledgeable place to ask!
The problem started rather suddenly as the bike felt like it was stuttering on the way home.
Once back I put it up on the centre stand and something is definitely up as the chain appears to be intermittently jumping off the top of the guide rail by about 2cm but continuing to run.
First thought was replacing the worn out drive chain and sprocket with new genuine parts (rather successfully for my first repair I'm quite proud of) but the issue still persists.
All is well while the bike is in neutral / not moving but everything starts up when the drive starts turning, so I believe it's either something to do with the clutch or the gearbox.
I have gearbox warranty, but don't want to pass it off to them if it's something I can fix myself, so any suggestions as to what might be the cause would be much obliged!


Thanks in advance,


Martin


(Video attached to demonstrate if unclear, though I have to apologise for quality / darkness)

darrsi

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Re: FZS600 Drive Diagnosis
« Reply #1 on: 21 January 2014, 08:58:49 pm »
Perfectly normal when the chain jumps, it needs a weight load.
It's the momentum of the wheel trying to overtake the chain but obviously can't so it slaps about.  ;)
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Martin11175

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Re: FZS600 Drive Diagnosis
« Reply #2 on: 21 January 2014, 09:03:37 pm »
Really? It didn't do this beforehand and you can feel it at lower revs when moving.
I can understand why it doesn't at higher revs as then it's under more tension like you say.

noggythenog

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Re: FZS600 Drive Diagnosis
« Reply #3 on: 21 January 2014, 09:07:53 pm »
I think the usual answer on here with a stuttering fazer is to firstly get your carbs balanced properly.


Then begin diagnostics...i seem to have read lots of similar issues involving old and dodgy HT leads, how old are they?


Strange that it happened mid journey but that at least rules out lots of other stuff as it's not like it was laid up for months or anything.
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noggythenog

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Re: FZS600 Drive Diagnosis
« Reply #4 on: 21 January 2014, 09:10:14 pm »
Just confirming that my chain does this jumping on the stand and it is perfectly normal.


You'll get far more issues on the other hand from your chain being too tight.


Is there any more to the story....have you made any recent adjustments or had any work done?
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limax2

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Re: FZS600 Drive Diagnosis
« Reply #5 on: 21 January 2014, 09:11:09 pm »
I agree with darrsi about the chain but the stuttering you felt while riding the bike sounds like an engine issue. Just a wild guess without more details but could be the carbs icing up if it was damp and cold at the time, or maybe an electrical issue if it was wet. Plus what noggy said.

darrsi

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Re: FZS600 Drive Diagnosis
« Reply #6 on: 21 January 2014, 09:13:09 pm »
Really? It didn't do this beforehand and you can feel it at lower revs when moving.
I can understand why it doesn't at higher revs as then it's under more tension like you say.


I promise you, mine does it too if it makes you feel any better.  :)


As for the stuttering, is it at any particular speeds, is it on acceleration, etc?
More info needed please.
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darrsi

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Re: FZS600 Drive Diagnosis
« Reply #7 on: 21 January 2014, 09:15:50 pm »
I agree with darrsi about the chain but the stuttering you felt while riding the bike sounds like an engine issue. Just a wild guess without more details but could be the carbs icing up if it was damp and cold at the time, or maybe an electrical issue if it was wet. Plus what noggy said.


Ha, carb icing, i should've been the first to think of that one, good shout.  :lol
More info needed yet though.
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Martin11175

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Re: FZS600 Drive Diagnosis
« Reply #8 on: 21 January 2014, 09:19:00 pm »
Wow, okay thanks guys for the multitude of explanations and proving my "sit it on the stand test" to be rather... faulty  ;)
Going for a quick ride out now to test the issue, will post results ASAP  :)

darrsi

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Re: FZS600 Drive Diagnosis
« Reply #9 on: 21 January 2014, 09:21:37 pm »
I agree with darrsi about the chain but the stuttering you felt while riding the bike sounds like an engine issue. Just a wild guess without more details but could be the carbs icing up if it was damp and cold at the time, or maybe an electrical issue if it was wet. Plus what noggy said.


Ha, carb icing, i should've been the first to think of that one, good shout.  :lol
More info needed yet though.


Hold on a minute, he has a Foxeye, are they not fuel injected?
That would rule out carb icing.
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noggythenog

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Re: FZS600 Drive Diagnosis
« Reply #10 on: 21 January 2014, 09:22:39 pm »
Get out there and thrash it........but be safe! :b


is it stuttering mid throttle after accelerating  smoothly.


Or is it hesitating a little bit at low revs.


Can you travel smoothly in 6th gear at 30mph on the flat & then smoothly move off in the same gear?
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noggythenog

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Re: FZS600 Drive Diagnosis
« Reply #11 on: 21 January 2014, 09:24:58 pm »




Hold on a minute, he has a Foxeye, are they not fuel injected?
That would rule out carb icing.



Are you losing it Darrssi, is this a plant???....like on QI with stephen fry?


Will a buzzer go off  :lol
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darrsi

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Re: FZS600 Drive Diagnosis
« Reply #12 on: 21 January 2014, 09:26:44 pm »
Wow, okay thanks guys for the multitude of explanations and proving my "sit it on the stand test" to be rather... faulty  ;)
Going for a quick ride out now to test the issue, will post results ASAP  :)


Just for future reference, it's not recommended you spray on chain lube using the "bike in gear on centre stand" method either, it's inviting an accident.  ;)
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darrsi

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Re: FZS600 Drive Diagnosis
« Reply #13 on: 21 January 2014, 09:28:28 pm »




Hold on a minute, he has a Foxeye, are they not fuel injected?
That would rule out carb icing.



Are you losing it Darrssi, is this a plant???....like on QI with stephen fry?


Will a buzzer go off  :lol


Am i barking up the wrong tree?
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noggythenog

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Re: FZS600 Drive Diagnosis
« Reply #14 on: 21 January 2014, 09:30:36 pm »




Hold on a minute, he has a Foxeye, are they not fuel injected?
That would rule out carb icing.



Are you losing it Darrssi, is this a plant???....like on QI with stephen fry?


Will a buzzer go off  :lol


Am i barking up the wrong tree?


Ye you're thinking about the FZ6.


To be fair though you still know infinitely more than me about the fazer & you also didnt fall off last year so you are excused. :D
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darrsi

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Re: FZS600 Drive Diagnosis
« Reply #15 on: 21 January 2014, 09:34:43 pm »




Hold on a minute, he has a Foxeye, are they not fuel injected?
That would rule out carb icing.



Are you losing it Darrssi, is this a plant???....like on QI with stephen fry?


Will a buzzer go off  :lol



Am i barking up the wrong tree?



Ye you're thinking about the FZ6.


To be fair though you still know infinitely more than me about the fazer & you also didnt fall off last year so you are excused. :D



Really???
I honestly was under the impression they were fuel injected for some unknown reason?
Dunno where i picked that up from then, ha ha?
I s'pose i just tend to concentrate more on the year of my bike.  :lol

"....Engines equipped with fuel injection do not require carb heat as they are not as prone to icing - the gasoline is injected as a steady stream just upstream of the intake valve, so evaporation occurs as the fuel/air mixture is being drawn into the cylinder, where metal temperatures are higher...."

I meant well though. :lol
« Last Edit: 21 January 2014, 09:35:58 pm by darrsi »
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noggythenog

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Re: FZS600 Drive Diagnosis
« Reply #16 on: 21 January 2014, 09:41:15 pm »
Ye seriously


Foxeye same as boxeye.....except it got foxy eyes....& a bigger tank.






Martin-stick around the site it's a good place.once youve diagnosed this or if you feel brave then go to the search bar along the top of the forum & click the search button...,type in "front sprocket nut" & search & fill your boots. 8)
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Martin11175

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Re: FZS600 Drive Diagnosis
« Reply #17 on: 21 January 2014, 09:47:09 pm »
HE RETURNS.
Sorry for the excitement everyone (unlike QI, no alarms, but like QI, no prizes other than a feeling of self-smugness) but it turns out that changing the drive sprockets and chain (or re-adjusting something while I was doing so, the old set was a bit past its last legs) seems to have fixed the issue.
Happy all the way during fast, slow and hard acceleration  :)


Thanks for all the knowledge and support, now I know to actually ride the thing before making judgement calls!


Apologies again (first big bike, didn't wanna wreck it by riding on a knackered whatever it might've been),


Martin.




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Re: FZS600 Drive Diagnosis
« Reply #18 on: 21 January 2014, 09:49:49 pm »
Awesome mate...remember though not to tight with the chain or youll suffer.


& get searching the front sprocket nut saga, you did just change the sprocket nut & tab washer didnt you???


Was it thicker than the old one?
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darrsi

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Re: FZS600 Drive Diagnosis
« Reply #19 on: 21 January 2014, 09:51:30 pm »
Awesome mate...remember though not to tight with the chain or youll suffer.


& get searching the front sprocket nut saga, you did just change the sprocket nut & tab washer didnt you???


Was it thicker than the old one?


Oh no.......  :lol
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Martin11175

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Re: FZS600 Drive Diagnosis
« Reply #20 on: 21 January 2014, 09:54:28 pm »
The nut saga?


I used the kit (both sprockets and chain) and changed the gasket and washer (as the mighty Haynes told me to) but not the nut.


I feel there's a story behind this?

darrsi

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Re: FZS600 Drive Diagnosis
« Reply #21 on: 21 January 2014, 10:05:57 pm »
To cut a long story short, there are issues with original size 9mm front sprocket nuts, ie: they fall off, weld themselves on, strip threads, etc.


So it's in your best interest to replace it with the new 12mm nut and washer  kit, for peace of mind, and the recommended torque for the new one is 90Nm.


PLENTY of info on here bout it, just do a search above for "front sprocket nut" and fill yer boots.  :)


NOTE: Part number for the kit is 90891-10124 and can be bought from Wemoto, Fowlers of Bristol or AJ Sutton, or any Yamaha dealer.
« Last Edit: 21 January 2014, 10:11:16 pm by darrsi »
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Martin11175

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Re: FZS600 Drive Diagnosis
« Reply #22 on: 21 January 2014, 10:21:36 pm »
Ah! Well then, I do believe a quick purchase might be in order to avoid long term pain!


Merci beaucoup monsiuer!  :)

darrsi

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Re: FZS600 Drive Diagnosis
« Reply #23 on: 21 January 2014, 10:33:31 pm »
Ah! Well then, I do believe a quick purchase might be in order to avoid long term pain!


Merci beaucoup monsiuer!  :)


They vary in price depending if you buy in a shop or online but they're only a few quid.


My nut welded itself on and was a bugger to get off, others have vanished completely and the majority of bikes have no issues at all, but it's certainly a peace of mind thing and a cheap one too.
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