so bike was working fine, turned it off at mates, jumped back on it after it was cold, had the same amount of power as before but when coming to a stop, it was revving really high, without Me touching throttle, so I pulled over and let it idle it was really high then dropped down really low and cut out, but now trying to get it to idle is odd, it's like pilot Jet is blocked as when idle turned up high it's fine, but like trying to make it normal it will idle and slowly start to drop until it dies and when Revved it doesn't come down straight away if slow comes down thanks in advance Isaac
Strip and clean the carb' you will likely find that that will cure it. Could be blockage in jet. When you accelerate the gunk is clear but you decelerate it settles and it draws the gunk into the jet hole; as the fuel supply shortens it will run lean (high rev) then die (starved). Strip carb' , clean well, that would be the first thing to try.
I cant see rollers with slight flat spots causing these symptoms. Still sounds fuel related to me which points to the carb. Possible that the clutch may be sticking open and not being closed by the contraspring but i cant see how it would cause the bike to stall. I would check the fuel system again, clean the whole carb through again, not just jets but full clean, even if you did it already. Check full throttle function, air screw, everything. I cant think what else it could be
Possibly an air leak somewhere, letting in air and leaning mixture? Check all pipework including vacuum pipes, maybe one split or rubbed through? Same with checking all gasket joints.
you need to set up your idle right. the idle speed screw and mixture screw must be adjusted with each other... errrm my english is failing me today, but steveP will drop by here and make good words.... blurgh.. i need coffee
I love how users here post "strip and clean carb" as if its such an easy thing to do that any user is capable of doing.
It is easy! If you can do a 50 piece jigsaw then you can strip a carb' . Tuning a carb' is an art and takes logic and understanding, stripping and cleaning is as simple as removing bits with simple tools, not losing said bits, cleaning every bit, drying and refitting back how it was. The first carb' strip takes a while as you get to know the pieces but i stripped my lads scooter carb at the roadside after a call for help. Took twenty mins tops, and i only dropped one screw, soon found with a good magnet. Its also fun to do, you get to understand the engine and how it all works and then when it goes wrong you know where to look. My kitchen worktop is perfect for stripping it down, my wife keeps it nice and clean. Good earplugs are useful to have. I stripped and rebuilt one four times in one day because it wasnt running right. It was the fourth clean that found the micro piece of rubber gasket sealant stuck in the jet nozzle, small and transparent...i never put sealant near my carbs again!! But honestly, carbs are easy , a little fiddly, take your time and be logical. I photographed all the stages of mine when i first did it, helps on rebuild. The difficult bit is when you start tuning or fault finding after the previous idiot owner did a bad rejetting job.
carbs are easy, yet hugely complex, i mean how they work is simple, you have the fuel in, which is controlled by the float height, the carb fills with fuel and the float shuts off when its full enough (like how a toilet works!) then there is a small tube which is down under the fuel level, this is the venturi, which has your main jet. then as air is pulled through to the engine, it sucks a small amount of fuel from the carb..... well thats the basics of carbs anyway... then theres topfuel motors, just shove a load of nitro into a supercharger.... hehee
