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+--- Thread: Stuttering FZS600 (sorry) (/showthread.php?tid=76928)
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Stuttering FZS600 (sorry) - Djxinator - 09-11-16
So I understand that this won't be foc-u's first rodeo with stuttering FZS600s...
I've seen a lot of threads and I'd like a list of possible causes and solutions. I've trawled the threads and found loads of stuff but if I were to try it all I would be here for a year (I only ride bikes, and this is my only functional bike right now so I don't have a car to fall back on)
Standard issue, works fine with feathering the throttle but as soon as I try to give it full beans I get the dreaded splutter until higher revs and then it bursts into life suddenly.
I wonder if its something as simple as it being 1-2 degrees outside and my journey to work is only 2 miles?
Thanks in advance.
Re: Stuttering FZS600 (sorry) - unfazed - 09-11-16
Is it only happening when cold?
Re: Stuttering FZS600 (sorry) - Djxinator - 09-11-16
Only bought the bike a month ago. Only 13,500 miles on the clock (22,000KM indicated), not started to open it up till recently and every time is been on a short ride in cold weather so I cant comment on its performance warm.
Re: Stuttering FZS600 (sorry) - unfazed - 09-11-16
Most likely carb icing caused by blocked carb coolant pipes.
What year is the bike?
Re: Stuttering FZS600 (sorry) - darrsi - 09-11-16
I remember when my bike had carb icing, it never felt like it could ever blast through it though, i just had to let the bike warm up at the side of the road sounding like a tractor until it melted from the heat of the engine, always in the same place too, about a mile from my house.
Re: Stuttering FZS600 (sorry) - unfazed - 09-11-16
Any 600 I have seen with the icing issue including my own, it only caused issues in the pilot circuit of the carbs. Above 6000 revs they all ran fine
Re: Stuttering FZS600 (sorry) - darrsi - 10-11-16
(09-11-16, 10:51 PM)unfazed link Wrote: Any 600 I have seen with the icing issue including my own, it only caused issues in the pilot circuit of the carbs. Above 6000 revs they all ran fine
Yeah, that would answer that then, there's no way i would've been revving that high in traffic on a busy 'A' road near where i live, the only way i could do any speed like that would be about 4am in the morning!
I had my carbs fully serviced not long after that and sure enough the carb heater circuit thin pipes were clogged up.
Even though the circuit pipes will need unclogging, i'm still gonna suggest the 99% Isopropyl Alcohol treatment, because it will take any moisture out of the tank which would certainly aid carb icing. 250ml per full tank of fuel does the job to get you out of trouble for now.
It will lower the freezing point of any moisture in the air or tank.
And 5 litres of the stuff on Ebay is not far off the price of 1 litre of Silkolene Pro FST which i personally think is a rip off, plus it doesn't work anywhere near as good either for carb icing, in comparison.
Re: Stuttering FZS600 (sorry) - Jules-C - 10-11-16
With mine the carb icing would give problems even at small throttle openings. It sounds like could be choked air filter that often give problems around the midrange
Re: Stuttering FZS600 (sorry) - His Dudeness - 10-11-16
(09-11-16, 07:38 PM)Djxinator link Wrote: So I understand that this won't be foc-u's first rodeo with stuttering FZS600s...
I've seen a lot of threads and I'd like a list of possible causes and solutions. I've trawled the threads and found loads of stuff but if I were to try it all I would be here for a year (I only ride bikes, and this is my only functional bike right now so I don't have a car to fall back on)
Standard issue, works fine with feathering the throttle but as soon as I try to give it full beans I get the dreaded splutter until higher revs and then it bursts into life suddenly.
I wonder if its something as simple as it being 1-2 degrees outside and my journey to work is only 2 miles?
Thanks in advance.
I had those same symptoms with a bike and it was running rich. I'd pop out the plugs and see if they are very black. If they are then like Jules-c said the air filter is the most likely culprit.
Re: Stuttering FZS600 (sorry) - Djxinator - 26-11-16
Problem is worse the colder it gets. I leave the bike sitting at 2000 revs on choke for 5 minutes before I set off to ease the problem. The father seems to think she runs like a dream after I let him have a go on it, bearing in mind its a 10 mile journey to his house and it was warmer that day. It definitely gets better with time (heat), I just wish I had a temperature gauge to see what temperature she likes.
Just bought a K&N Air filter, an Oil filter and some more oil.
I'll give her the basic once over sevice before I faff about with anything else.
Anyone had experience with NGK Irdium Spark Plugs? I'm wondering (when I eventually replace mine) if they're any better than stock plugs.
Re: Stuttering FZS600 (sorry) - darrsi - 26-11-16
From experience, there's so many things that can cause this it'll be an elimination process until you find it.
No matter which angle you look at it though, once warm the bike should run fine, no ifs or buts, i'm on about a quick warm up on the choke in very cold weather then it should be good to go.
You keep mentioning short journeys, so why not take it on a longer journey for starters, and see how it behaves?
Nothing major, just take it for a blast to get the heat up, and see if anything changes.
If something is simply not right, then i doubt engine heat will improve things, a bike that's mechanically sound won't have these kind of problems, so you need to do things one step at a time.
Stuttering can be caused by:
Air leak, ie: cracked inlet rubbers
TPS (Throttle Position Sensor) Do a quick check on it, it can cause starting, running, and idle problems,if breaking down or knackered.
Spark Plugs, loose, old,or fouled with oil. (Iridium are longer lasting, look around online, you'll find someone that sells them at a reasonable price)
Carbs,have you ever had them balanced? I'm guessing no. Air filter and TPS have to be spot on for a good carb balance to work well, but once done properly can make it feel like you're riding a new bike, especially at lower revs, it makes a huge difference, even more so if it hasn't been done for years which is a big possibility.
HT Leads, i had my own problems myself with starting, and was guided to chop 10mm off the ends of each HT lead then screw the spark plug caps back on, and again the bike found a new lease of life. To say i'm a fussy bastard is an understatement where my bike's concerned, and even after replacing bits and bobs i knew it just wasn't quite right when starting in the mornings, but this simple enhancement worked wonders, and it runs beautifully now.
Double check the caps haven't worked their way loose at all, the caps just tighten on to a self tapping screw, it's a crude but age old method.
Spark Plug Caps, on that note which caps are on your bike? OEM ones have a tendency to eventually give up, which in fairness is understandable after so many years. However, with the mileage on your bike i'd guess this is an unlikely scenario, but worth knowing that new OEM caps cost above £200, yet you can buy NGK replacements for just over a tenner that work just as well.
http://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.TRS0&_nkw=SD05F+&_sacat=0
There's a few pointers for you, go through them and you'll get to the bottom of the problem eventually, whilst inadvertently servicing your bike at the same time.
NOTE: Make a note somewhere of all mods or services that you do to your bike. Tyre changes, oil, plugs, literally everything, then you'll be able to keep on top of things before stuff starts going tits up (technical term).
Any questions or help needed, we're always here to teach or mock. :thumbup
Re: Stuttering FZS600 (sorry) - Bretty - 26-11-16
(09-11-16, 07:38 PM)Djxinator link Wrote: .... I'd like a list of possible causes and solutions.... but if I were to try it all I would be here for a year...
So you want someone else to go to the trouble of talking you through the diagnostics rather than you bothering? Fair enough.
Start with a process of elimination...
Is it one cylinder or all four? - start the bike from cold. As it hots up, dab a 'spitty' finger on each exhaust pipe. See if they all sizzle the same or if one cylinder is colder than the other.
Really generally speaking, if they are all the same it'll point you down an electrics, fueling, air filter/box issue.
If just one cylinder it'll likely be a spark plug, cap, coil, carb issue with that one cylinder.
At the moment you're giving very little information and asking for a lot back.
Re: Stuttering FZS600 (sorry) - Bretty - 26-11-16
I didn't read Darrsi's reply before writing mine. But basically what he said!! ^^^
Re: Stuttering FZS600 (sorry) - darrsi - 26-11-16
(26-11-16, 01:32 PM)Bretty link Wrote: I didn't read Darrsi's reply before writing mine. But basically what he said!! ^^^
Easily missed..... :lol
Re: Stuttering FZS600 (sorry) - Bretty - 26-11-16
I didn't miss it..
I just didn't read it. :p
Re: Stuttering FZS600 (sorry) - Carlsv8 - 06-12-16
Hello DJ
Got the same problem with my newly acquired 2002 600. If I sit in neutral with the bike warm it revs smoothly but on the road has the standard faults except sometimes it is reluctant at higher revs as well. My TPS is fine, carbs were balanced recently by the previous owner but on inspection I have 9E plugs in (these are for a warmer climate as I understand) so have ordered some 8Es, along with a new air filter. If this doesn't work I'm going to do plug caps, petrol additive then carb heater hoses. I'll update as I progress on the off chance that you are still having snags.
Cheers
Carl
Re: Stuttering FZS600 (sorry) - darrsi - 06-12-16
(06-12-16, 10:04 AM)Carlsv8 link Wrote: Hello DJ
Got the same problem with my newly acquired 2002 600. If I sit in neutral with the bike warm it revs smoothly but on the road has the standard faults except sometimes it is reluctant at higher revs as well. My TPS is fine, carbs were balanced recently by the previous owner but on inspection I have 9E plugs in (these are for a warmer climate as I understand) so have ordered some 8Es, along with a new air filter. If this doesn't work I'm going to do plug caps, petrol additive then carb heater hoses. I'll update as I progress on the off chance that you are still having snags.
Cheers
Carl
Carb balance does wonders to a bike, but only if the air filter was good when it was done.
I balanced my carbs once with a stuffed up air filter and it ran very ropey, until i cleaned the air filter then did it again.
Doubt the different grade plugs will make any difference, they both cover our climate.
Re: Stuttering FZS600 (sorry) - unfazed - 06-12-16
If you have carried out all the usual checks, plugs, plug caps, TPS, air filter, intake rubbers, carbs and the problem still exists, I would suggest you replace the Regulator/Rectifier unit. Came across this problem a few times, including in my sons bike and changing the Regulator/Rectifier resolved it.
Re: Stuttering FZS600 (sorry) - darrsi - 06-12-16
(06-12-16, 04:16 PM)unfazed link Wrote: If you have carried out all the usual checks, plugs, plug caps, TPS, air filter, intake rubbers, carbs and the problem still exists, I would suggest you replace the Regulator/Rectifier unit. Came across this problem a few times, including in my sons bike and changing the Regulator/Rectifier resolved it.
http://www.ebay.co.uk/itm/Regulator-Rectifier-Voltage-Fit-YYAMAHA-TDM850-XVZ1300-95-05-FZS600-98-03-2002-/131919012179?hash=item1eb6fc6153:g:kZwAAOSw-itXvqzK
A sensibly priced replacement, I just put one on my bike.
Re: Stuttering FZS600 (sorry) - Carlsv8 - 25-12-16
New plugs, the solution to my little bike's woes, running like a dream now.