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Discussion Starter · #1 · (Edited)
My new to me bike has been running really rich and I got tired of farting around. I have a 658 with stock exhaust and airbox mods.
Temporarily put a AFR (Lambda/UEGO) gauge onto the bike to see what is going on. So many seat of the pants info and dodgy "info/recommendations" (Bike Specs at the bottom below the images).


Alt: 1050M (3400')
Dyno Jet Kit. C-Clip on 2nd notch of needle.
40 idle Jet, 2 turn out
Keihn 145 Main Jet (the DJ orifices are wayyy too big)

Results:
Idle at 14.5 (nearly Perfect)
Cruising at 12.2 to 13 (Little Rich, Ideally its closer to 15.5ish)
Acceleration 11.5 to 12ish (no change with WOT at full load, Maybe a bit rich).

Next time the Carb is out or I have the tank off I will move the clip to the fist position)

Motor vehicle Automotive tire Automotive design Auto part Automotive exterior

Automotive tire Hood Motor vehicle Automotive lighting Tire


2008, 65k on the ODO
685 Kit
Uni Filter
Airbox 1" drilled holes (3 ontop)
Screen removed
Carb slide drilled
DJ needle with clip on 2nd position
Stock Muffler
 

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Discussion Starter · #4 ·
The stock DK setup has a reputation for running rich. Gas mileage goes down too.

Did you weld a bung into the header pipe to install the O2 sensor?
Yep. Circled it in one of the photos. Just behind the heat shield and before the hanger. Will just put a plug in it after I remove the temporary install. Dont even need to take anything off the bike. Just cut some zip ties.
 

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Discussion Starter · #7 ·
Update.
Changed the main jet down to 142.5.
Needle at second ring (still, did not change)
Idle stayed at 14.5
Accel is now at 12.8 to 13.2
Cruise is 13.5

Considerably more power! Noticeable Torque change for the better and there is power all the way up to 6k when before it was drop off pretty sharply at 5k.
 

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