Hey, i'm wondering if any one has had any experience with the Virago 250's carby's? I am checking over and tuning my uncles' bike atm. The bike has done 60,000km's, and has an issue of vibration at around 2500 rpm's. Mixture screw was set at 3 turn's out on the BDS26, it has a foam air filter, clean and lightly oiled (factory fitted?) Choke is working fine The spark plug's aren't that old (C6HSA) but were black, and slightly wet, so i gave them a soda blast and they've come up like new. They have a decent blue spark when firing. I pulled the fuel bowl off and found a bit of dirt etc in the bottom, took the jet's and emulsion tube out and gave that a thorough clean, including blowing compressed air through all the port's in the carby. The jet needle and needle jet both look fine (no sign's of wear), slide move's nicely and the diaphram is all good. There was a bit of black stain to the engine side of the carby bore directly after the throttle butterfly which i think was caused from it running on the transition circuit and pilot jet, idle speed was turned up to compensate. Accellerator pump is working fine too I have replaced the intake manifold which was old and cracked, i had repaired it with urethane about 6 week's ago to fix a vacuum leak while waiting for the new manifold to arrive. New china intake wasn't the best quality, it had a rubber flap inside blocking on of the 2x port's to the head where it had been extruded or however it's made and the port's to the head were too 2mm too small as well. I spent about 45min's with the dremel, a carbide burr and some sanding roll's on a drum, cleaning it all up inside, getting rid of dag's and rubber and opened up the port's to 24mm as per the original one. New manifold bolted up to the head's nice and has sealed ok (eg no vacuum leak's) So i checked the fuel height on the outside of the bowl with some pvc tube connected to the drain, and it was set at about 27mm, factory spec's say 16.5mm-17.5mm. Fuel height is now set back down to 16.5mm. There is no float height setting spec's in the factory service manual. And no mixture screw setting spec's either (think they had a brass cap over the mixture screw as they were preset from factory), but the cap had been removed on this one. I've set the mixture screw to 1.5 turn's out and started the bike and let it warm up. The idle sound's a bit rich (slightly deep sound and putt, putt's a bit) I turned the mixture screw back in all the way (lightly seated) and the idle has smoothened out, it sound's close to normal now The vibration seem's to have gone now. I haven't had a chance to take it out for a ride yet, but the mixture screw been set in so far (0 turn's out) has me thinking there's still an issue. This carby has a fuel cut off switch as well as an electronic heater to stop it icing up in the cold I'm wondering if either of these could be playing up? I tried it with the heater disconnected and it didn't make a difference.