(10-04-14, 09:14 PM)Sannox link Wrote: Liking the IPA idea :-) After 10 of them, I won't care :-D
Bunged the carbs back on tonight, was a bugger of a job to get the air filter housing and tubes back onto the carbs, that took the longest, sadly though, was still the same, so, clean as a whistle carbs and not the carbs, maybe.
On one note, any revs above 5k seems to blast through the stuttering, blow 5k and it's tractor time, above 5, it stutters then takes off, change gear and no problem as the revs are high, but then, at those revs and speeds, you don't snap the throttle open anyway, so still stumped. Going to check the caps next me thinks and look at some IPA :-D
Hi Sannox, any update.
Just joined the site, was doing a Google search and found your post.
I am showing the same symptoms.
Bike starts, idols and runs great. Will ride perfectly under normal acceleration but when you crank the throttle it sputters as if its on 3 cylinders, get it past the stuttering and she goes like a rocket, hang onto the grips.
History:
Bike is a 99 FZS600.
Had a leak in the fuel Tank, took it off and repaired it then coated the inside of the tank with a special epoxy resin.
Tank was stinking inside, cleaned it well before repair, cleared the vents in the base of the tank post epoxy refurb, think they are correct as I seem to get the same noise / volume of air when i blow through them, one is an overflow direct from the top of the tank as it pressurises the tank when you blow into it, the other seems to come from up near the filler.
Bike runs OK but still does not taking the throttle hard.
Replaced the Fuel Filter, origional one seems OK.
Next thought it was the Carbs filled with gunk, possibly a large particle intermittently blocking a jet, removed the carbs and serviced them, think they are spotless.
Replaced the Carb to Inlet rubbers with new ones as they were badly cracked.
Still same problem not taking the throttle.
One of the boys in work says it sounds like vacuum, know I bent the rubber vent tubes when installing the tank, thought that was problem, not, as have cut 2cm off the top to clear and crease in the tubing and reseated correctly. Still no joy.
Have still to check the Plugs and Plug leads, was going to start them tonight but found out that Car and Bike spark plug sockets are different. Will get a correct socket tomorrow.
Tank is off the bike at the moment, going to check the air filter. Theory is that cranking open the throttle needs more air, air filter possibly blocked. Also waiting for it to get dark, going to check for any signs of Plug Hi-tension lead arching to the engine etc. One of the boys with a vacuum guage has promised the balance the carbs next week.
Any suggestions or an update on where you are would be great.
(17-04-14, 12:23 AM)NiallMcD link Wrote: [quote author=Sannox link=topic=12523.msg140862#msg140862 date=1397160871]
Liking the IPA idea :-) After 10 of them, I won't care :-D
Bunged the carbs back on tonight, was a bugger of a job to get the air filter housing and tubes back onto the carbs, that took the longest, sadly though, was still the same, so, clean as a whistle carbs and not the carbs, maybe.
On one note, any revs above 5k seems to blast through the stuttering, blow 5k and it's tractor time, above 5, it stutters then takes off, change gear and no problem as the revs are high, but then, at those revs and speeds, you don't snap the throttle open anyway, so still stumped. Going to check the caps next me thinks and look at some IPA :-D
Hi Sannox, any update.
Just joined the site, was doing a Google search and found your post.
I am showing the same symptoms.
Bike starts, idols and runs great. Will ride perfectly under normal acceleration but when you crank the throttle it sputters as if its on 3 cylinders, get it past the stuttering and she goes like a rocket, hang onto the grips.
History:
Bike is a 99 FZS600.
Had a leak in the fuel Tank, took it off and repaired it then coated the inside of the tank with a special epoxy resin.
Tank was stinking inside, cleaned it well before repair, cleared the vents in the base of the tank post epoxy refurb, think they are correct as I seem to get the same noise / volume of air when i blow through them, one is an overflow direct from the top of the tank as it pressurises the tank when you blow into it, the other seems to come from up near the filler.
Bike runs OK but still does not taking the throttle hard.
Replaced the Fuel Filter, origional one seems OK.
Next thought it was the Carbs filled with gunk, possibly a large particle intermittently blocking a jet, removed the carbs and serviced them, think they are spotless.
Replaced the Carb to Inlet rubbers with new ones as they were badly cracked.
Still same problem not taking the throttle.
One of the boys in work says it sounds like vacuum, know I b[size=1em]ent the rubber vent tubes when installing the tank, thought that was problem, not, as have cut 2cm off the top to clear and crease in the tubing and reseated correctly.[/size] [size=1em]Still no joy.[/size]
[size=1em]Have still to check the Plugs and Plug leads, was going to start them tonight but found out that Car and Bike spark plug sockets are different.[/size] [size=1em]Will get a correct socket tomorrow.[/size]
[size=1em]Tank is off the bike at the moment, going to check the air filter. Theory is that cranking open the throttle needs more air, air filter possibly blocked.[/size] [size=1em]Also waiting for it to get dark, going to check for any signs of Plug Hi-tension lead arching to the engine etc. [/size] [size=1em]One of the boys with a vacuum guage has promised the balance the carbs next week. [/size]
[size=1em]Any suggestions or an update on where you are would be great.[/size]
[/quote]
Take your air filter cover off and see if the air filter is a snug fit, or if it can move about as if you could just chuck it in.
Been a few issues with cheap Hi-Flo air filters that can cause running troubles, i had problems myself with one.
If it looks ill fitting, remove it and take the bike for a quick spin and see if it improves things at all.
More people are born because of alcohol than will ever die from it.
I had same symptoms, tryed every thing as it felt like fuel issues. Carb rubbers were perished, replaced them. Carbs filthy, cleaned them. Filter clogged, replaced it. Plugs, replaced. Nothing made any difference. Replaced plug caps, bike's run like a dream now. On the up side,a lot of hard work but the best service my bike has ever had. So for 20 quid, worth replacing anyway.
Back after a week away on holiday, saw loads of bikes, grrrrr :-)
Anyway, just about to bypass the fuel pump so I have direct gravity feed to the carbs, if it runs fine, then it's the pump, not touching anything else yet, the next to look at will be the plugs, I know they are only 2k old but got to be worth a look, as I'm on hols, I grabbed my multimeter from work, my own, not works and will check the plug cap restistances, 13 year old bike now, original plug caps, hmmmmm, the air filter is spotless and seated properly, will post the results of the test blast/fart later :-)
Nope, wasn't that, ran fine but slightly less responsive due to gravity feed I guess, warmed up then crack open the throttle, back to the juddering.........
Carbs clean, air filter clean and seated properly, carb rubbers fine, fuel pump appears fine, all pipes not kinked.........
Plug cap resistances, book says 10k, I've got 3 caps at 8k and one at 14k
Coil secondary resistance at 14k, book says 12k to 18k, so ok there, primary by the book is 1.87 ohms to 2.53 ohms and I've got 6.5 ohms per coil, so matched but way out.
Checked the plugs, all looking as they should, and the gaps were all at 0.8mm, book says 0.6 to 0.8 so closed the gap to 0.7
Tried my last option, plug caps, from the checks, one was high resistance anyway, so thought it might be an idea for a new set, originals at £50 a go ish and none on ebay got me looking about, saw that the old Honda CX500 caps are a good replacement and available from M&P, as M&P are 20 min away, off I want, they had 1 in stock, buggerit, the very nice staff dug out a NGK book and suggested these...
Not impressed with the colour as I've resprayed my bike black (keeping the decals etc) and a few blue bolts for the screen, but red? Anyway, who am I to be fussy, I want a bike that runs, these do the trick, the screw for the HT lead is deep inside but the HT leads are long enough, they are totally waterproof, so I kept the original caps for the lead end anyway and pushed them onto the ends, perfect fit and not taking any chances with water....
Glad you got there in the end-plug caps & leads have a very hard life-at least you've given the carbs & fuel supply line the once over-cant hurt-now go & enjoy the rain! :lol
