Problem with my 2005 Yamaha YBR 125 carb type. Bought it privately few weeks ago, it didn't tick over very well then but thought it just needed a good service.
It starts ok but after warmed up and ready, if the revs are picked up then throttle off it tends to drop to about 3,000rpm for a few seconds then slowly down to a tick over around 1500rpm. If the throttle stop screw is turned out any more it cuts out during tick over.
The carb, jets and air filter have been cleaned out, pilot air screw adjusted to 11/2 turns out, throttle cable adjusted ok and throttle valve sits down after closing the throttle grip. So all looks fine but not happy that revs don't drop straight down as they should.
Would appreciate any advise,