coils are rarely bad, check all the connections back to the points, check the plug ends(boots) , and make sure you have good grounding to the frame. it is easy to swap the blue and yellow leads from the points, and switch the wires @ the plugs(thus making the 1-4 coil the 2-3 coil) this will comfirm the coil is good as well as the points. (if you don't have an multimeter)
I had the same issue, turned out to be two carb problems simultaneously on the carbs that were on the same coil, (talk about effing troubleshooting ...nightmare)
Find the problem first, throwing parts @ it is a waste of money, and you can introduce new variables and problems to the mix...
sift through the FAQS again there is a ton of stuff....
OH yeah, CHOP IT>>> lower, and get rid of the dead weight. i slapped some gangster WWalls on mine....