a week ago my rotar arm broke so i put new rotar arm and cap on it and new leads, now i get poppin flames out the maifold from the twin 45's on number one cylinder, i swapped the plugs on 1 and 3 but no difference. its a 2 litre running twin webers 45's, as far as i can tell the distributor hasnt moved so the timing should be the same as before anyone pls help
i had this when i installed the TBs. turned out to be the rotor arm had turned and got stuck about 30 degrees off centre.
put it back on properly tut tut.
OR your leads are in the wrong order, its timing and not a dropped valve.
i thought a new rotar arm would only go in the right position as there is a groove and a plastic bit that fit s in it, leads are in the right order. if a valove on 1 had dropped that would stop the fuel gettin to the cylinder and make it pop out the manifold wouldnt it? need to compreesion test it and check timing with a gun i think