I've got a 1989 Suzuki RM250, running a PWK Keihin carb from a 1997 (big improvement) and looking to sort out a 1/4-1/2 throttle sputter/burble.
See video below:
As you can hear, when the bikes under load on full throttle it runs clean and pulls well. However at the 1/4-1/2 throttle range just before it really comes on the pipe, it sputters and burbles a little and it definitely bugs me.
Listen at around the 3:50 mark.
Is this a lean or a rich condition? Do I need to alter needle clip or taper?
I know the jetting is close as the plug colour is nice and there is minimal carbon build up on the piston at top end changes. But would love to iron out this rough patch if possible.
40:1 Putoline MX7 - UK Premium Pump 97 octane
Temps typically around 10-25 C
Elevation 0-1000 feet
Carb currently set at:
45 Pilot
A/S 1.5 out
#7 Slide
NEDH Needle on Clip 3
170 Main (have a 168 on order)
Any help would be greatly appreciated!
@russ_69