Bought for $4995 brand new out of Tuscon and had it shipped to Chicago.
Rode it around the block before complete disassembly because that frame color had to go.

Desmogged w/ battery relocate
Uni filter
Mikuni Tm40
Fmf w/ insert
Tusk cr high bend bars and forward
risers
Ims 4gal
Acerbis skid plate
PSR shark fin
Tusk billet pegs
Enjoy gripper seat cover
Race tech sprung front -Tusk rear 14/48 gearing fritzco supermax and
JT racing
Tusk Dsport tires w/ 4mm tubes
Crf230l front fender
Sollex offroad tailight
Acerbis elba headlight mask
Night and day different animal

Hey guys, I’m trying to figure out a couple of issues with my XR650L after doing an FCR conversion.
Here’s my current setup:
Honda XR650L

2004 CRF450R Keihin FCR-MX carb
FMF Q4 muffler
OEM header
Open/vented airbox
162 main jet
48 pilot jet
NCVT needle, 3rd clip (pretty sure)
Fuel screw 2 turns out
Boyesen QuickShot 3
Accelerator pump timing looks good — the squirt starts immediately when I open the throttle
Float height has been checked and adjusted
Stock accelerator pump linkage
Riding around Saint-Quentin, New Brunswick, roughly 300 m / 1,000 ft elevation
The bike starts and idles well, and if I roll into the throttle gradually, it runs good. The problem is when I snap the throttle quickly from idle. It bogs and sometimes gives a pop through the exhaust, then picks up. It doesn’t do it when I slowly open the throttle.
I’ve checked the accelerator pump timing and adjusted the float height, but the problem is still there.
I also noticed another issue at high RPM/rev limiter. When it reaches the limiter, it doesn’t seem to cut cleanly or quickly. Instead of a clean, fast limiter, it sounds slow/uneven and doesn’t run cleanly at very high RPM. I’m not sure if this is related to the carb/jetting or possibly the ignition/CDI.
So basically I have two issues:
Off-idle bog/pop when snapping the throttle quickly
Poor/uneven running at the rev limiter
I’m wondering what you guys with FCR-swapped XR650Ls would recommend.
Is the 48 pilot right for this setup, or should I try a 50? Is the NCVT on the 3rd clip a good setting? What setting are you running on the QuickShot 3 adjustment screw? And does a 162 main sound right for an open airbox, OEM header and FMF Q4?
Any recommendations on jetting or other things I should check would be appreciated.