The 61 Venom we just did a top end job on ran great on the lift, and tootling around outside the shop (through 1st/2nd gears) and when back with the customer, did 2 road runs - both over 100 miles. On those runs, he was under strict orders to not do much over 50mph, not to let the motor lug on hills - more keep running it up and down through the rev range.
He was having trouble starting it at home, though it was starting first kick on the lift, and on bringing it back for a post run check, we couldn't find anything amiss. More - it now takes a slightly different technique to fire it up than he's been used to. On picking the bike up this last Sunday, he fired it up outside our shop -- first kick, using the 'new' method, and was very happy. We told him the rings seemed to be seated correctly, and he could now start 'goosing' her a bit on rides.
Later that day, he called to say he'd taken the bike for a run at home (2+ hours from our shop) and it was doing some something odd.
Though it fired up quite readily - he said once warmed up and out on the road and at a normal cruising speed (50mph or so) when he opened the throttle, it didn't want to accelerate -- more just sort of baulked, then slowly started to pick up revs. Once he got back home (he wasn't far away) he said he pulled into the garage, and as he let go of the throttle, it returned to idle - but then started to 'hunt' -- revs rising and dropping without him touching the throttle. A couple of hours later, he again fired it up - and it reacted normally (though he didn't ride it again) just sitting and idling.
I have asked him to mark the throttle, to try and ascertain what rev range it is in when it is acting 'odd' --- which may tell us something. However - the hunting thing has me a tad miffed?
It has an AMAL
Premier 930 on it - and though not sure of jetting, they came stock for that model, with a 200 main, 106 needle jet and #3 slide (not sure on the pilot jet)
Magneto was rebuilt (professionally), with new points/Brightspark Easy Cap etc.