Carbs or something else, maybe?

[darrsi]

[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.