How Fast Honda Express Go | Top Speed | Stock | Performance Tuning...

If you own a 1977, 1978, or 1980's Honda Express moped... I am sure you have thought, "How can I make my stock express noped go FASTER!!!" 20-28 mph is great for cruising back roads, downtown small cities, or even along the beach/boardwalk. But, when you need to keep up with traffic on some busy roads or just get somewhere a little quicker... Express Honda performance modification might be what you are looking for. Also, most people don't want to spend $300 or even $150 on aftermarket performance parts. Honda moped owners just want to spend a few hours in their garage and tinker to push out 2-3 or even 10+ mph more. It can be done!

Here is a recently uploaded YouTube video of a vintage honda express owner who modified their stock moped muffler, bored their intake out, enlarged exhaust port, and did a spark plug chop. This brought his stock honda express top speed from 26 mph to 35+mph with little to no money spent.

Here are some initial/standard performance tuning tips to get you started (look around this site for much more information regarding honda express performance tuning):

• Clean your express scooter carburetor (Don't forget to clean the honda express carburetor jet) 
• Replace moped spark plug
• Fill tire pressure properly (see honda moped manual)
• Clean moped ignition point:




• Add a little Performance Boost to your fuel (won’t boost speed, but will help engine running smoother and facilitate overall engine process).
• Change your transmission case oil (use new Royal Purple 10W-40)
• Remove your air filter (WARNING - be careful when doing this. You could overheat your engine if air is not properly regulated) Doing this will allow a leaner mix of air/fuel and give you a boost.
• Modify moped muffler (open it up... cut out some guts... weld back together) Doing this will probably provide you with the most performance boost (for no $$$). CLICK HERE FOR MUFFLER MOD HOW TO VIDEO

My next post will have detailed information on purchase aftermarket performance parts for your honda express nc50, na50, express sr, express II mopeds.

1978 Honda Express Print Advertisement - Get On!

C'mon America, get on the Honda Express.
 

Honda Express Moped Battery | nc50 scooter parts | How To Remove, Repair, Replace 1978 honda

Honda Express Moped Parts | How to remove, clean, repair, refill, replace a 1978 Honda Express scooter battery. This can be done on any stock or new moped battery as part of your regular maintenance.



Additional Honda Videos:
Honda Express Oil Pump
Honda Express Carburetor

Honda Express Oil Pump | How to Remove, Inspect, Repair, Install 1978 NC 50 Oil Pump Scooter

Honda Express Oil Pump video is done! I have edited the video and uploaded it to YouTube. You can view the entire video below. The video will take you through (step-by-step) process of removing your Honda Express Scooter's oil pump. I have tried to interject helpful tips and information during the video to help you with inspecting and reinstalling your oil pump. It is good practice to check your oil pump several times throughout the lifetime of your nc 50 moped. It helps with moped performance and prevents the oil pump for malfunctioning and seizing the engine. Good Luck!

 

Checkout my other YouTube video on How to Remove Honda Express Moped Carburetor.

Honda Express Spark Plug Moped NC 50 Scooter | How To Inspect

Honda Express Spark Plug inspection begins with understanding how the spark plug functions and what a GOOD running engine's moped spark plug should look like. I will also touch upon inspection, adjustment, and where to buy moped spark plug for sale.

Two cycle engines run hotter than four-cycle engines since each upward movement of the piston is a compression stroke and each downward movement, a power stroke. At the peak of the compression stroke an electrical current is sent through the spark plug and creates an electrical spark. This spark ignites the air/oil/fuel mixture thus generating the power stroke downward.

The electrical current jumps across a "gap" on the spark plug. The gap can be adjusted to the honda nc 50 manual specifications to ensure proper firing. The correct spark plug gap for the 1978 Honda Express is 0.6 - 0.7mm [see diagram below]

[click above graphic to enlarge]

You can pickup a moped spark plug gap measuring device at any local auto parts store, including Pep Boys and Advanced Auto Parts. [see picture of tool to left]

To achieve your honda moped's top speed you need to have the right combination of air and fuel in the cylinder to be ignited. This is when you will hear the terms "lean" and "rich" concerning your mixture.

• Moped Engine Running LEAN - Too much air in fuel/air mixture being fired by the engine.
• Moped Engine Running RICH - Too much fuel in the fuel/air mixture being fired by the engine.

To figure out if your engine is running too lean or rich you can remove and inspect your spark plug. A good running spark plug should look a light chocolate brown color. If the honda spark plug is black and sooty the engine is running too rich. If the express spark plug is black and shiny (very oily) then it is oil fouled. If the nc50 spark plug is whitish you could be running too lean, wrong ignition timing, or even too hot of a spark plug. There are spark plug charts online that can help you identify how your engine is running. [see chart to right - click to enlarge]

Detailed Video of Honda Express Moped NC50 1978 Scooter

I recently found the following video listed on YouTube that is a video documentary of a stock (good condition) Honda NC 50 moped express model. The commentary is a little boring and it drags on, but it is really helpful if you wanted to take apart the scooter bike and needed to know how everything goes back together. The moped manual give directions on how to reassemble the honda express moped parts but isn't very detailed about how/where to route the cables and brake lines. If anything, it nice to see a video of a good looking moped!