First check the valve clearances. Check/adjust these when the engine is cold - .004' inlet and .006' for exhaust, don't be too fussy any clearance is better than no clearance! Next you should check compression for both cylinders, they should be within 10% of each other. Assuming you have the original points set-up these too can 'adjust' out of tolerance when they get warm. Keep in mind the bike is 41 years old and may need more frequent tlc, best o luck.
SOURCE: misfire & spluttering when warm
Hi wayne
Not knowing what you have checked or done already, I would first remove the spark plug from the bike and check it fir a carbon deposits. If it has not had a new one for a while, Just get a new one and replace it. Before I drop the oil for a service(as it can dirty up the oil), I also like to run a fuel system cleaner additrive(I use a Nulon product) to my bikes every few thousand kays, just to keep everything tip top. If you still have misfire problems, then it will most likely be a faulty sparkplug cap, ignition lead or other ignition part. Change out/clean spark plug with a wire brush first. I think that will fix it for you. If you still have problems,happy to talk to you more about it.
regards
robotek
SOURCE: engine dying
Check your kick stand sensor if it's unplugged then there is your problem. If it's still plugged in then the sensor might be gone. The sensor shuts the bike down if you try to take off when the kick stand is down. you can bypass the sensor by jumping the two wires before the sensor with a piece of wire connecting the two leads together. doing so will allow the bike to be put into gear with the kick stand down so always check it so you won't have an accident.
SOURCE: Will not restart after being warmed up, it starts easy when cold.
those symptons sound like too rich , air filter clean , plugs dirty
nothing blocking the air intake make sure the valve clearances are as per manual
burnt valves ?
get a compression test done
SOURCE: Yamaha TW 200 starts but won't run.
If the bike has sat for a long period of time without being run - the gas that is sitting in the carb(s) will shellac.. Then the carb(s) would need to be cleaned and "rebuilt"..
SOURCE: 2001 triumph Bonneville very cold nature
how do you make stock bonneville pipes louder [2001]
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