650b2 carb issue

[DavidZ1R]

Hi guys, I have an annoying stutter from closed throttle to opening it up, soon goes but annoying, carbs stripped and blown through, and cleaned, notch 3 on needles, all stock jets and air box, only thing not stock is the patten silencers, could it be I need to change the pilots? Tia.

[zed1015]

notch 3 on needles Tia.

The needle position is wrong .
On the 650 it should to be 4th from the top so it needs lifting a notch.
Also have you had your choke plunger seats done ?

[DavidZ1R]

notch 3 on needles Tia.

The needle position is wrong .
On the 650 it should to be 4th from the top so it needs lifting a notch.
Also have you had your choke plunger seats done ?

Yes you did the plungers, I thought the manual said 3rd notch, will double check, cheers

[gray]

similar prob for me earlier this summer cured by replacing the advancer unit springs - they had stretched and so when you opened the throttle a bit, it went to full advance straightaway.

[DavidZ1R]

Yes the ignition was next up for me, I replaced the carb boots yesterday just in case, just the same, that's easier than taking the bloody carbs off again.