Good luck! The TI ignition is much more reliable and as long as the charging system is working properly then you would be in good shape from that perspective.
You may want to test the voltage and see if it is in range. The plug caps on the CX500 can have the same problem as the CBs. There are some sources for replacements, I don't think Honda has them any longer. There are rebuild instructions on the CX forum for eliminating the resistor with a section of brass rod (there is a discrete resistor in them.) The replacement caps are in GB and I think that DSS now carries them (use the US location for ordering if going from there)
The plug cap is unique in that it seals off the recess that the plug is located in to keep debris out. (Don't want junk to go into the motor when pulling a plug out.)
When they replace with a solid brass bit the issue of resistance goes away and you then use resistor plugs.
This is an OK guide for buying a CX or GL... better than nothing.
Hope you see this before you take off.
https://motofaction.org/motorcycles/honda-cx-gl/honda-cx-gl-buying-guide/If you have single caliper then go for this as a reliable and inexpensive 14mm MC for $28:
http://www.ebay.com/itm/401047901633?rmvSB=trueor for dual calipers then this $34.00 16mm or 5/8" MC works pretty good and is inexpensive and reliable.
http://www.ebay.com/itm/401047901633?rmvSB=trueFar cheaper than trying to rebuild one as the rebuild kits are pretty expensive. You can also get the DSS MC that is an aftermarket unit for $40-45. It is probably suitable for the single caliper setup as I think it is a 14mm bore.
Hopefully the motor will be cold and you can get an idea on the tensioner and any motor clacking/clicking noises.
(part of the triple bypass corrective/preventive maintenance (water pump seal, tensioner/guides and cam chain - manual adjustment system unless the GL is a late model which has the automatic adjuster, and the starter clutch springs...since your bike is a TI model you are not likely to have a stator problem)
Exhaust shields can contribute to ticking and clinking and clacking noises so a screwdriver against them to press them up tight should change or eliminate any noise from that guard/shield.
Sirius Consolidated and Randakk's are the best sources for carb parts unless you are ordering from Honda. The Mikuni carbs Murray Feldman sells are worth looking at if you need major carb work. Murray's carbs are a very good solution.
murrayscarb.com or Larry Cargill can work on the CX carbs and get them purring and clean. Larry charges around 300 for doing a set.
Murray offers a replacement to the H-box beneath the bike and lots remove it and put the intermediate pipe Murray makes and a set of take-off mufflers from a Harley. The tone is a deeper note than the stock quieter pipes.
Good luck in your exam tomorrow.
Hope you find it to your liking and is at an attractive price.
David
When you