The
main is too large for any aftermarket needle RoadieSL. You need to get to the right main size or put the stock needle back in. Quickest solution will be to put the stock needle back in (if you have not modified the stock airbox for more venting).
With an aftermarket needle you are going to need a main jet (
MIK) that is smaller than 175. Most likely with stock airbox either a 172.5, a 170, or amybe even a 167.5.
The dealer must have used the third clip because the main was too large. Its a VERY restrictive clip position and real tough to tune for as it never really lets the main get fully open like it should. That would explain the 3.8% CO. 3.8 to 4.2 is in the zone for a Road Star but you didn't tell us what
RPM that was at. At Idle Road Stars should really be at 4.0 or slightly higher, at any other speed 3.8 or higher (in reality it goes all over the board at different
RPMS -don't fixate over this- if your going tune for it get it right at idle, and right at rpms above the torque peak - torque peak is point of greatest engine vibration).
Right now you are running on the needle rather than the main and that is miserable and not very good for drivability. With a
Dyna needle you should really be on 4th or 5th clip position.
SO..... if you want to do this yourself, do this:
Go buy a mikuni 170 main, and if you want to hegde your bet a 167.5 and 172.5 as well. Put the 170 in, set needle to 5th clip position and adjust the
pms for middle position between stumble from too far in and stumble for too far out. If you never get to stumble for too far in your main is too large (replace with next smaller main and start over - don't even have to leave the garage on that one).
Then do a
WOT test to see if the main is too small. If it is, replace with next size up main and start over. Since the needle will be in 5th position, its going to be running rich unless you get lucky enough to match the main exactly (rare but it happens on some bikes) so don't judge drivability. Just get it warmed up and test the main. When you have the right main, try adjusting the needle to 4th clip position (adjust PMS again) and check drivability (ignore idle and closed thottle drivability). If you can maintain smooth acceleration once your off the line 4th is a good clip position for you and will get better gas mileage. If you can't it is most likely too lean.
Then, crem de' le crem, find the article in the Tech Articles about dialing in the PMS and go for a dial in ride. Or, just find the mid point between stumbles and make adjustments when you think you need to.
Gram
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), but judging by your elevation, I'd say you're too rich. According to the instructions in the Cobra jet kit (which is made by DynaJet), your 
So on the advice I got here (RSC), I reinstalled the stock 35 pilot jet.
I think you may be on the rich side. The 
... could you please shrink your sig pic to less than 450 pixels wide and 50 kb in size. Thanks,
