Hi there, my rx 50 (2006, 55 plate) is deresricted (it will reach 50/55 mph) but i´ve been having trouble with it. It completely dies at about 40mph / when throttle is pulled back completely. Will only start again with choke and will only pull away with revs just below full. Took carb off - will give it a clean, but is there anything else obvious it could be before i re-assemble it and find out it´s still having the same problem? Electrics maybe?