Buy six in line spark tester connect one to each cylinder run it on the muffs, guarantee to see some cylinders dropping out you may also use a flash light and look up under the flywheel check for any presence of melting gooey varnish stuff, any traces of it you will need to pull the flywheel and look at your trigger/stator.
Check this link out it
http://www.maxrules.com/fixomcoisignition.html
Tool link
http://www.harborfreight.com/inline-...cker-4424.html