Control Arms: Oem, Bushings Nolathane, Sankei 555 ball joints
Struts(front): Kyb + Oem springs
Shocks(rear): Kyb + Progress rear sway bar
Tierod: CTR outter, Sankei 555 inner
Wheel bearings: Timiken
Camber Bolts: Oem
Front Stabilizer Bar: Oem
Rear Stabilizer Bar: Progress 19mm
Tire: 185 / 50
Wheel:16" Oem 14 spoke
Oil: 5w-20 (5k interval) Oem filter-15400-PLM-A02 (Fram) 15400-RTA-003 (Toyo Roki)
Transmission Fluid: Genuine Honda DW-1 OR Aisin DW-1 OR Idemitsu ATF H PLUS
Plug: Denso or NGK
Engine l15a7: Spoon- fork
Belt&Pulley: Oem
AC pulley: Oem
Radiator&Hoses: Oem
Water Pump: Oem / Aisin
Exhaust: Full Oem
Intake&Air Filter: Oem

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solve ALL the vacuum sync&leak issues, ensure properly clean fuel flow, from the tank-filter-lines-fuel T splitter-float height-jets, triple check the engine timing, ensure working battery and charging system, clean electrical contacts, start with fresh set of spark plugs if it absolutely cant start anymore. If it doesn't turn on right away its a sign of too many settings being too far away from factory values. When in doubt try to rely on factory settings and components.

A series of issues can feel like its just one big problem, but its a LOT of smaller issues adding up. The first quarter/half throttle can feel horrendously messed up when all the possible issues are too stray from factory. Perhaps other less reliable models wouldn't even start. Please look up the honda manual and do the 6K mile tune up. Please start with new intake manifold gaskets and carb boot rubber to solve many vacuum leaks.

Freshly charged battery, perhaps new regulator/rectifier, inspect the wiring around the coils specifically, check for loose stuff or signs of arcing. Engine wise, inspect the tappets and ensure they are not too tight and similarly too loose. The tightness per tappet being too far away from another can effect the way the engine feels and is easy to screw up the first time. The carbs being at least mostly tuned well and sync'd has a huge effect.

If the engine is tired the compression will be about 100-115 psi roughly speaking, until its quite tired and below that, the engine will have a very hard time starting. The most common issue with the CB500/550s in my opinion is carbs being at the right settings, a charging system with too much loss, and an engine being too tired- Piston rings, valves, valve guides, valve seats, head gasket.