07-08-2019, 12:54 PM
Yeah you are running lean there, no question. Spray some brake cleaner around the boots/carb when the idle is hanging and then see if it brings the idle down, if not then you need to dig further.
Ideally, if someone else has figured out the 'recipe' of the above slide/needle/jet/idle mix adjustments then copy that - I'm presuming since its a pretty common motor that the info is out there. The "Jetting Kit" may not be appropriate for all the mods, too, many of them are garbage. Just keep in mind with carbamaphone tuning that the fueling is relative to throttle position and not engine speed. If its only having issue at idle and decel with throttle closed then you may be on the right track with the idle mix - but those have a window of effective adjustment - usually 1-2.5 turns - outside of that you should change your pilot jet - and check the float height, too, too low on the float can cause you to run lean.
I'd start with this - put a new plug in, and fire it up. Dont touch the throttle at all, let it run and warm up - 5-10 minutes - dont touch the throttle - shut it down and read the plug. You'll see if your idle mix is on point or not, adjust the idle mix screw as needed, repeat. Once you get that dialed then figure out pay attention to where its causing rideability issues on the road....
![[Image: jet-chart.jpg]](http://www.jba.bc.ca/JBCycle/Resources/jet-chart.jpg)
Ideally, if someone else has figured out the 'recipe' of the above slide/needle/jet/idle mix adjustments then copy that - I'm presuming since its a pretty common motor that the info is out there. The "Jetting Kit" may not be appropriate for all the mods, too, many of them are garbage. Just keep in mind with carbamaphone tuning that the fueling is relative to throttle position and not engine speed. If its only having issue at idle and decel with throttle closed then you may be on the right track with the idle mix - but those have a window of effective adjustment - usually 1-2.5 turns - outside of that you should change your pilot jet - and check the float height, too, too low on the float can cause you to run lean.
I'd start with this - put a new plug in, and fire it up. Dont touch the throttle at all, let it run and warm up - 5-10 minutes - dont touch the throttle - shut it down and read the plug. You'll see if your idle mix is on point or not, adjust the idle mix screw as needed, repeat. Once you get that dialed then figure out pay attention to where its causing rideability issues on the road....