Join Date: Jun 2014
Location: New Hampshire, USA
I had this issue all last year on my '14. I was determined to figure it out at pretty much any cost as my dealer was baffled also. Set up at the time the stalling began: '14 non-R, Akra Map, Rally Cam, DNA S2, stock header (48mm ID), GPR De-cat mid (52 mm ID), GPR can (54mm ID inlet), Kevs O2 mod, all SAS/cranckcase oil recovery/charcoal canister still installed and functioning, valve clearances all within spec. I believe our bikes are set up similarly, so heres what i did and some of the noticed results.
15 min idle reset: No difference
New gas: Little difference
Seafoam in gas: Noticeably smoother idle, less hesitation
DB killer in exhaust exit: No stalling, but ran like a fat pig with a broken leg
Diameter reduction/torque insert between mid pipe and can: Less stalling, but undesirable torque curve and unresponsive throttle
-Here's where I get frustrated and start throwing money at the problem!
New throttle body: No difference
Arrow one piece header (48mm ID full length, 54mm OD exit), re-packed GPR can: Stalling is reduced, but still happens, perfect torque curve for the street IMO
Removal and blanking of SAS, oil sep, charcoal canister: Incredible difference in hard de-cell engine braking predicability and perceived "smoothness" of throttle roll on, no de-cell popping or engine cut anymore, BUT still the occasional stall at a light
Removal of Kev's o2 mod, but keeping o2 sensor: Nearly resolved stalling issue, and smoothed out idle for months, then stalled once, BUT now Im getting close!
Removed and cleaned injector: And there it was, like a new machine! Have to settle the front back down in 1&2, and inadvertently hit the rev limiter in the first 3
No stalling as of yet, so after all that it seems SAS removal, O2 Mod removal, and injector cleaning (prob means I need a new filter) made the greatest improvements for me, hope this helps and saves you some time and frustration
Now: '14 KTM 690 Duke
'00 DR 200
Favorite Past: '01 DRZ 400e SM'd
'04 GSX-R 750
'01 CBR 929
'78 DS 100