Low revs stuttering

[Punkstig]

We're they set correctly and equally or did you not count when turning them in?

[Anarch]

I've counted when dissasembling carbs, now changed all of them to 2.5 turns + balanced carbs and no real change.

[neilavo62]

hi,
    i also put a new K&N filter in this year and developed the same problem.
i have since put the baffles back in and it sorted the stutter out.
hope this might help..

[red98]

mmmmmmmm...had a scorpion end can on my thou....very lumpy idle and uneaven upto 3/4000 rpm,great at higher revs,put the std can back on and now very smooth,has k+n filter 

[nick crisp]

All very interesting - got a similar problem on my thou. Was much worse with open Viper can which was on the bike when I bought it. Changed to standard can, better but not right still. Have just put new Scorpion can on, as good as standard, but still not right. Problem seems to be at worst at about 3k rpm off throttle. Everywhere else, no problem. Can't work on my own bike due to shoulder problem which makes things very awkward, so sooner or later gonna have to take it in somewhere and lay out for someone else to take a look 
Pilot circuit problem?

[red98]

All very interesting - got a similar problem on my thou. Was much worse with open Viper can which was on the bike when I bought it. Changed to standard can, better but not right still. Have just put new Scorpion can on, as good as standard, but still not right. Problem seems to be at worst at about 3k rpm off throttle. Everywhere else, no problem. Can't work on my own bike due to shoulder problem which makes things very awkward, so sooner or later gonna have to take it in somewhere and lay out for someone else to take a look 
Pilot circuit problem?

hi nick......baffle,in or out ?

[nick crisp]

Baffle in. I've no idea what's in the airbox either.

[red98]

Baffle in. I've no idea what's in the airbox either.

i would be interested to see what its like if you ever take the baffle out   

[nick crisp]

Red, tbh I don't think the problem is to do with the can, even though it was worse with a straight thru pipe. I've consulted with Mike (Falcon 269) about this, he suggests looking at plugs/plug caps/HT leads first, which I will have checked/changed when I (finally) get round to taking it in. But I've had bikes with those sorts of problems before, and it just doesn't feel like that, you know? Plus, with plugs/coils breaking down, I would've thought the problem would be worse higher up the rev range?

[nick crisp]

PS.
I've also run a fuel system treatment through the tank, no change.

[red98]

mmmmmm...sounds like you two have simular problems  :\ ....ANARCH..looks like your carbs are ok then    iam thinking electrics but not my strongest point  :o  when i first started trying to cure my stutter i bought secondhand ecu,tps and coils and swapped them in turn to see if that was the problem,japanese electrics are very reliable and after 15 yrs and 40,000 miles mine were fine.....looks like mine is a wiring fault (worn through and broken) but not proved yet  :rolleyes

i`ll be interested to see what ADE THE BLADE thinks...................

[CRH]

mmmmmm...sounds like you two have simular problems  :\ ....ANARCH..looks like your carbs are ok then    iam thinking electrics but not my strongest point  :o  when i first started trying to cure my stutter i bought secondhand ecu,tps and coils and swapped them in turn to see if that was the problem,japanese electrics are very reliable and after 15 yrs and 40,000 miles mine were fine.....looks like mine is a wiring fault (worn through and broken) but not proved yet  :rolleyes

i`ll be interested to see what ADE THE BLADE thinks...................

...no use asking morris paul!!..he,s tooooo loved up with....BAAAAAAAAAAAAAAAAAAAAAAAbra :rolleyes

[red98]

ha ha....MORRIS THE BLADE.....dos`nt roll of the tongue as well as ade,earning a few extra quids and he does get to keep the outfits  :lol :lol :lol ........come on ade put baaaaaaaaabra down and give us your opinion.......

[Anarch]

[quote author=red98 link=topic=7901.msg82122#msg82122 date=1371467337]
mmmmmm...sounds like you two have simular problems  :\ ....ANARCH..looks like your carbs are ok then    iam thinking electrics but not my strongest point  :o  when i first started trying to cure my stutter i bought secondhand ecu,tps and coils and swapped them in turn to see if that was the problem,japanese electrics are very reliable and after 15 yrs and 40,000 miles mine were fine.....looks like mine is a wiring fault (worn through and broken) but not proved yet  :rolleyes

i`ll be interested to see what ADE THE BLADE thinks...................

...no use asking morris paul!!..he,s tooooo loved up with....BAAAAAAAAAAAAAAAAAAAAAAAbra :rolleyes
[/quote]


I think I'll make a video of the engine running tomorrow - maybe this will give you some ideas - cause I'm clueless at this point


Initially I was only able to detect it up to 3k RPM but now I can hear when accelerating up to 6k. Could it have anything to do with exhaust ?

[nick crisp]

Anarch, was your bike laid up for any length of time before you got the symptoms? It's just that Soapy, who's just joined FOC-U, is having similar problem after his bike was laid up for the winter - I bought mine recently from a dealer and suspect it may have sat for a while since last use.

[red98]

video would be good  ....my thou is effected by the end can,lumpy tickover and up to 3/4000,great there on,i think its the way the cans are just not my cup of tea.....

[nick crisp]

Except that mine's doing it with standard can too... :\

[red98]

Except that mine's doing it with standard can too... :\

thats blown it  :rolleyes

[Soapy]

Except that mine's doing it with standard can too... :\

Hi Nick. Looks we are part of a small club with similar issues. Hopefully between us we can get sorted. Cheers John S

[otis]

Had a similar problem a few months ago. #1 zorts was not getting as hot as the others. Checked the plug and had not bad spark. Turned out that it was a dodgey plug that would break down as I gave it the beans but ok if I nursed it. I know you have changed the plugs but you get bad ones. Have you tested the headers to see if any are not as hot as the rest ?