PROBLEM: My XR650R ran fine but it would sometimes fail to return to idle when I came to a stop. I’d have to blip the throttle three or four times to get it to settle down. After first determining there was no friction or interference in the throttle cable and linkage, I suspected I had a lean condition caused by either a loose manifold boot or something afoul in the pilot circuit. SOLUTION: Your probably familiar with the sage advice of changing one thing at a time when your jetting a carb. Well I did not follow that advice, I fixed my problem, but I don’t know what to attribute the cure to. 1st I disabled the AJCV (Air Jet Cut Off Valve) by placing a tab of electrical tape on top of the 1/8” o-ring prior to reassembly. I read else ware someone advising cutting the plunger off the back side of the diaphragm, that to would disable the “deceleration softening circuit” but would be otherwise irreversible, so I went the PVC tape route. 2nd I reamed the 65s pilot jet with a paper clip (too big), then with a B string from my guitar (too small) then I found that a bread twist tie with the paper striped off made a perfect ream. Buttoned up the beast took her for a spin. Not once did the idle hang, she just settles down to a loping thump. Tomorrow I’ll pull the tape and see what effect it has. BTW what is the consensus for removing the spring loaded backfire flap from the choke plate? I wouldn’t want that plate and spring sucked into my topend, but I would like to retain full choke.