02 road King, FLHR, carb'ed. 35K miles. Recently had hard starts ( on and off for 2 days). Next day, bike won't start. Starter engages, and hear normal startup noise, but engine doesn't catch. Battery voltage is good (12.6V), have fuel, petcock on, run/kill in run position. Checked plugs (using autolite right now, since carb adjustment last year), not fouled, just a little dark... replaced anyway, and still no turn over. Checked vacuum at top of petcock (old fashioned way: removed vac line, put vac line on finger, crank starter, FEEL vac pulling. Ignition fuse (blue, 15 amp) and starter relay ok.. Heard people say it could be CKS (Crankshaft Position Sensor)... how can I tell for sure (IF you agree it is the problem), and how hard for a medium level mechanic (one step above novice) to replace? I can do all the maintenance, but diagnosis of a problem takes me too long, and I don't know what to look at FIRST! But as far as replacing parts, I can do that! Thanks! PS, did I miss any things to check for FIRST? Can anyone tell me to try something else that is definitive in pointing to (or pointing away from) a specific problem? If someone has a checklist, which shows the best order to trouble shoot, I would appreciate it! Thanks again!