Reddit mentions of NGK (3437) DR9EA Standard Spark Plug, Pack of 1

I would go to ex500.org and register on the forums first. Anyways here's my top mods:

• Replaced clutch springs with stiffer ones - this helps at higher RPMs because the stock ones start weak and get weaker with age $10.80
  
  
• Replaced rear shock with stocker from a new gen ninjette because it's a lot stiffer and raises the bike a bit $49.99
  
  
• Removed the pair system because it does nothing good and with exhaust it makes popping noises $15.00
  
  
• K&N air filter installed and drilled 4 Half Inch holes in the left side of airbox $49.99
  
  
• Airbox mod requires carb tweaking so I opened up the carbs and rebuilt them for reliability $45
  
  
• Got some shorty levers 36.99
  
  
• Replaced stock ignition with Coil on Plug type ignition for an '08 ZX6R - prices vary but i got mine for 40 bucks including harness.
  
  
• New sparks gapped at .30" $8.10
  
  
• Higher quality front brakes $32.00
  
  
• Oil changed to Shell Rotella T $19.16
  
  
• Avon Roadrider tires big upgrade over stock. Prices vary I got mine for 350 installed both front and rear
  
  
• Best for last: Racetech .90kg/mm springs with gold valves $300