I don't think most people could tell the difference between a properly jetted stock carb and the flat slide with a pumper.
still fun to think about, i'm wayyyy tooooo cheap to spend 800 on a carb too
PS i've been working lots but i have the o ring mod nearly done. Gotta lean out the needle more as the pilot jet overlaps into the needle effective range (which is normal). Then it should be perfect. and because of the larger pilot (with a leaner needle setting than stock (KLX needle)). The throttle response is wicked and no perceptible lag that most people would feel. You n i would, but we aren't most people.
Bikes are a bitch to Jet with ethanol Fuel, as you mentioned Damocles. The ethanol fk's up the plug color, makes it look lean when it isn't. I've had to adjust the way i do things, since what i used to do doesn't work the same. But fun figuring it all out.
Only reason i'm leaning the needle is to get the fuel economy better than stock. (only got 45 mpg at 75 miles an hour into a headwind half the trip) The bike runs fk'n deadly. Mega Mid range , fantastic throttle response.
I used to wrench a DRAG SNOWMOBILE that was a 1200 triple running lectron carbs. Nice carb but, too much $$$$ and i'm not sure its much better other than its simple and fast to tune.
Harley (and Kawasaki, on some Vulcan models) may have thought otherwise, installing 40 mm Keihin carburetors with accelerator pumps on their motorcycles.
Still, a minuscule perhaps, but inevitable, time delay exists between throttle opening and slide rising (a time interval defined in this post as, throttle response time) with a CV carb, even with a CV carb featuring an accelerator pump.
So, how significant is stock CVK40 throttle response time delay? And, how essential is throttle response time to KLR650 typical service life (as in, no competitive situation, ever)?
Hogging out the vacuum transfer port hole (to, 7/64" diameter) may improve throttle response, marginally. Again, how significant might such throttle response time improvement be? Stock KLR650 throttle response time may be acceptable, to some.