Wednesday, April 27, 2011

Honda Express Moped Muffler Modification | NC50 Scooter Noped | Exhaust Mod


Honda Moped Muffler Modification how to video is here! Our moped performance tuning enthusiasts asked for it and it has been cut/edited and uploaded to YouTube for the world to enjoy. This simple scooter video walks you through the process of modifying your stock 1978 nc50 moped exhaust to increase the performance. The desired results will vary on your modification technique and moped setup. The mod job was done on a stock honda express with no performance parts added. Was able to gain 5-10 mph due to this simple, FREE, and safe tuning technique.


Let us know what other "how to" videos you would be interested in seeing. Taking requests now...

25 noped comments:

nickerachi said...

YES!! This video is great! Thanks for posting. Can't wait to see the kit vid!

So, what are your speed results?

jfk said...

Personally on mine, I found a speed increase of 5-10mph. The stock un-modded muffler seemed to restrict the top speed... it felt like it was holding back. I just appeared to run smoother and faster after the mod.

The kit video will take a little longer, because I took almost too much footage. I think I'm hosting a TV show or something while I filming the video... then later when I'm editing... I keep getting pissed at myself because I am just talking way too much and not all of it is helpful. :)

Tell your friends about this site, check back often, click some advertising links for me, and post on other blogs.

Happy Riding.

-=JFK=-

littlerightlefty84 said...

This is SWEET! how long did it take you to do it? and do you know anyone that dose this and sells them from the 87'?

jfk said...

@littlerightlefty84,

Took a couple days, because I had help with the welding and tried to fit into my busy schedule. I'll sell you mine for $200. Ha! Other than that... no... just save yourself the $$ and do it yourself.

Jay said...

How much louder did it get? significantly louder?
Thanks

jfk said...

@Jay,

Not really obnoxiously loud... just little louder with more "poppy" sound in exhaust. If you listen to the difference between the un-modified muffler and modified muffler in above video.. maybe that would help demonstrate.

-=JFK=-

littlerightlefty84 said...

Hey i just finished my muffler mod and there is an easier and cheaper way of closing it back up! It's called JB Wled. its amazing and its like 8 bucks. The whole thing only took me 1.5 hours (most of that was changing the cutting disks) ALSO! im fiddeling with a quick and easy way to muffle the new "poppy" noice after the mod.

jfk said...

@littlerightlefty84,

WHAT!?!? muffle the "poppy" noise? You gotta post what you did, if it works. With pics too!

I have not tried the JB Weld, but I have seen the stuff. I'm gonna try that next time.

-=JFK=-

littlerightlefty84 said...

Yeah! ive tried a few things and the best so far is a 1.75in roll of aluminium (i just it off a pop can, writing and coloring on the inside) and used a hose clam to put it on the muffler. I painted it white so it matched the muffler cover and other plastic covers.

Now ive tried a few different things to the opening, and the best thing i've tried so far is closing the opening to a little more then width of a quarter. I am still tweakin and playing around with things. I'll post pics and/or video's when im done.

JB Weld works PERFECT I applied it twice and there is no cracks and ive driven it about 100 miles since doing the mod. Also i haven't noticed any negitive affects of adding the slip-on.

jfk said...

@littlerightlefty84,

So in short... you rule! Contact me when you've got some videos and pics to post. I put them on this blog. Cool?

-=JFK=-

Jay said...

I did it guys! Muffler modded it. Cut it, drilled the holes. Welded it up. Im still only maxing at 30 MPH, but much better acceleration. I used a plasma cutter (flamethrower with my muffler,so much oil) to open it and a mig welder to weld it. Also used some DIY rhino lining leftovers on it. Turned out great. Off topic though, my steering is loose i believe. I can turn the handle bars a little before the forks turn. What should I look into? Also is replacing the brakes a pain? I got some ordered and need to do it. BTW JFK thanks for this amazing website, I only got my express 3 weeks ago but I love it. And you make it even more fun and amazing. Ive ordered that replacement headlight, the battery, tires and tubes. All recommended by you! Thanks a ton man

jfk said...

@Jay,

First off... THANK YOU!!! People like you who realize how cool the Honda Express is... keeps me going. The express noped is FUN and great hobby to tinker/upgrade with. I ask 2 things of you. 1. Contribute. Takes some pictures of your express and email them to me with a short write-up of the work you have done. Maybe even take a video. Produce something that will "give back" to the moped community and send it to me at binaryblock-moped [AT] yahoo.com. 2. Click some Ads on the site. It is a nice "thank you" to get a few buck here and there when people click the ads on the website.

Ask and you shall receive! I will put together a short video on "How To Change Break Pads on 1978 Honda express" and post next week!

Take care, have fun riding, and check back often for new website content.

-=JFK=-

Jay said...

I will get pictures asap, been busy finishing school for the season. However I had enough time today to do my brakes and tires. I replaced the brakes with genuine honda pads, replaced the tubes and tires http://www.motorcycle-superstore.com/5/32/404/20923/ITEM/IRC-NR77--Front-Scooter-Tire.aspx?WT.ac=Recently_Viewed used on both the front and back even though they say front only! Rides so smooth. Just have to figure out why my back brake doesn't brighten when I pull the handle, and my 1978 express will be set!

sofasurfer said...

Can you please give us measurements for the placement of the cuts on the muffler?

dan barnett said...

I just got mine done. Used a grinder with a thin cutting wheel. This was great since it cut the case and the mesh inside all in one and it only took a couple minutes.

So far I've noticed maybe a 3mph gain on flats and down hill. It seems a little slower going up hill though. I'm still getting the carb dialed in. I had to raise the needle up one clip as it was running too lean with it in the middle. Anyone else had to do this? Any other tips for getting the most out of this upgrade?

It is definitely louder but I don't think it's obnoxious. Then again I have a helmet on and I like the sound of 2-strokes.

handymo907 said...

hey long time reader first timer writer. i have a 78 nc50 here in Alaska with 220 miles on it i have done a little painting and polishing. and i alaso rebuilt the carb. which was just replacing paper gaskets and cleaning everything. besides that and a few other things it is stock. i am looking for a good place to buy parts. i really need an exaust cover to make this thing pristine! any help would be much appreciated.

Brian Edward Zenk said...

I'm glad that someone found my NC50 muffler drawing and used it to cut open the nc50 express muffler. Sincerely Brian Zenk

brileyj said...

I recently was at a guys house and he gave me 2 old mopeds 1 a 1980 honda express the other a yamaha but i have been working on the honda I do not know much but it will start for a few seconds then wont start again for an hour or so there are some parts under the seat missing as they have the wires wired together and I am not sure where to plug the battery in i do not see any place to plug it in I know there must be something missing but the question is what and i work on cars trucks ect but never a motorcycle or a moped can anyone help me out here

brileyj said...

Oh i forgot to say that if you have any ideas please e-mail me brileyjames72@gmail.com please put HOnda moped in the subjet line thanks again

quaff said...

What are the sizes of the holes drilled?

Pat

Philip Ohl said...

JFK, I just purchased a 1980 Honda Express II on a whim because it looked cool, was cheap, and I've always wanted a moped since I was a kid. I had no idea how much I'd get into it. It's only been a few days, so I'm still tinkering and learning. But your site has become like a bible to me! I'm going to attempt the muffler mod tomorrow. I just purchased a 'back up' muffler on ebay in case it doesn't work out. The seller also had another muffler from a similar model I believe, but it doesn't fit exactly (the rear fender brace doesn't attach). So now I'll have 3 mufflers to mess around with.
Anyway, thanks for this site man!

And said...

Mann I just found a mint 1977 Honda Express NC-50 in my aunts basement. The only thing I had to do was clean the tank out throw some kreme kit in it and just clean some stuff and it's running pretty nice... I am DEFIENTELY MODIFYING MY MUFFLER!!! But my only problem is if you open the throttle to much it skips and like bucks forward a little an you don't go past 10.. But if you lightly pull the throttle and easily hold it open a little it gets to about 26... Any idea what could be causing the skipping an non smoothness of it

jfk said...

And,

Sounds like your carburetor needs to be adjusted. The bucking and skipping is probably the engine getting too much fuel. Try cleaning carb and adjusting the air/fuel screws. It is a pain in butt and while take a lot of trials, but you can fix it.
Also, make sure the muffler is attached securely and you're not getting any to much back pressure from exhaust.

Have FUN!

-=JFK=-

Keisha Gonzales said...

Hey jay my light don't work also cant seem to fix it I have went over and over it if u fix it plz let me know

D0N said...

I just picked up a really nice 1978 NC50 with 1660 miles on it. She runs like a top and rides very smooth. I think it's a keeper (I usually flip everything for a profit) to hang on the back of my RV. This would be perfect in a campground.

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