Friday, April 11, 2014

Steps For NC50 Honda Express 1978 Moped Performance Tuning

The steps For NC50 Honda Express 1978 Moped Performance Tuning are as follows:

  1. Clean and make sure everything stock is in order... then begin. (ie: clean the carb) 
  2. Make sure good new honda nc50 battery
  3. All new oils and gas. 
  4. (supa' cheap start) Honda Moped Muffler Modification 
  5. (got some $$$ then go straight to new pipe) : MLM Muffler Sidebleed Exhaust Pipe from (wait for sale :) 
  6. Upgrade your engine CCs : Honda DR 70cc racing kit from
    You should be around 33mph (at weight 165'ish lbs) 
  7. Premix and remove the honda express stock oil pump
    Note: 1978 nc50 has the oil mixing and going directly into the stock intake. You would need to cap off the stock intake. I have seen some people fill the old oil reservoir with pre-mix as well (run at least 50:1 mix, especially when kitted engine) and use a plastic fuel-rated "Y" connector with the main fuel line and get a little "extra" gasoline storage. 
  8. Replace your reeds with Boyesen Dual Stage Reeds from 
  9. Replace your honda express weak-ends custom nc50 intake 
  10. Upgrade your honda express carb to a Mikuni VM 20mm carburetor
  11. Tune the carb (I'm still working on this one). Get some Mikuni VM 20mm jets : Mikuni main jets from
  12. (be cool and measure metrics on your noped like speed, temp, tach, etc) : Get a TrailTech Vapor

I hope to have a full "How To" video setup in the coming months. So... subscribe to me :)

4 noped comments:

Unknown said...

When I mod my moped out to 70cc and mod the muffler, is it completely necessary that i plug the oil pump and premix myself? Have you tried it without?

Unknown said...

I have a very "squeaky" back brake on my 1978 Express. Any suggestions on how to stop that?

jfk said...


Yeah... you can replace the pads or ruff them up with sand paper. Not much more than that. I would think the squeak would go away after lots of use.


jfk said...


I ran my nc50 with a 70cc kit and STOCK carb with the oil pump hooked up... it worked fine.

When you put a bigger than STOCK carb on the noped you really should remove the oil pump... as to not burn it out. You will create more problems than you want without premix.


Post a Comment | Feed

Post a Comment