misfire

[albreese]

firstly thanks for replies to my post on the front forks on the csr new 20w oil at the correct amount job a good un .
now the bikes got a misfire but only when its hot,carbs cleen as a whistle,tried new plugs champ n5c,not sure but spark on left plug lead seems weaker than the right when the motors hot,on cold start its first kick and soon settles to a perfect even tickover but after say two miles today missing very badly,rotor arm or dis cap?help
yours cant go far alan

[dave16mct]

It should have a K2F Lucas Magneto. If someone has fitted a distibutor and coil ignition, then it could be the condensor (easiest and cheapest thing to try first). You will have to give us more details eg 6 or 12 volts? Cheers Dave.

[Rob Harknett]

If the fuel is old, try draining the tank and put in freash fuel. I assume the float level is OK and fuel getting through Ok, so not stavation. Poss air leak or sticking valve