I have an annoying stutter when running on a steady throttle around 11-12k bike accelerates well no hunting at all will easily pass the red line. Carbs have been clean have new jets from gf. Any suggestions

Suggest slides may be lifting to quick -- perhaps wrong slide springs or someone may have drilled the slide holes a touch to big.

Some after marked headers give this symptom as well ...

Cheers

Got the springs from you so I think they will be OK. Other sounds like I need new carbs? Headers are standard. Will replace fuel filter and clean out tap filter first I think

ok so
replaced fuel pump relay
replaced filter
not much improvement
next
put fuel lines back in correct position
Check fuel pump output.

fuel pump output 1800cc/min so well above the 660cc min quoted

sorry to but in and on my first post here.

i have the same problem with my bike.

revs out fine in neutral but if i am in say 5th or 6th. it trys to hold back all the time.

i took the carbs off today to check the mixture screws and they were set to 1 & 1/2 turns the manual says 2 & 1/4

they may had been a pipe off to but i cant remember as i was a bit hunger over today.

the bike is pulling a bit better but it wont rev past 11000 when in 5th or 6th neutral is fine.

i have a after market pipe on mine.

jonhunt did you just start doing it>? mine has been doing since i got the bike.

Its done it since rubuilding the carbs but they were such a mess before I can't say if it was there from the off. I don't have a problem with revs I can't bang it well into the red if I'm not carefully and it will hold 13k plius on steady throttle but you can feel a pull and hold back

Took the carbs off at the weekend, no 4 intake manifold had a sliver of rubber scrapped of probably partly obstructing the airflow. we will see if this makes a difference.

Seems to be better after a quick run but I want to take it further than I had time for last night, Had the down pipes off as well for a coat of PJ1 there was a lot of carbon soot deposits around the exhaust manifold maybe running rich? Need to check the plugs.

Further to my little saga. Chnged a few things but still have an irritating condition. t seems to be worse when hot. In particular idle is difficult to predict. i.e. it will sometimes stall at junctions off the thottle, or drop of & die. Sometimees its OK. Good news is its got a gold ECU so no restrictions