Honda Urban Express NU50 performance mods

There goes the neighborhood. Made this to show how I transformed my Honda Urban Express NU50 from a stock noped that only got up to 26 MPH, to a speed devil heathen straight from the gates of hell! Ok, so I increased its top speed by only 10 but that's a pretty good start. This video shows the trial I went through to do that.

upgraded parts:

belt: Napa BX31
exhaust: Proma Circuit for PA50 (modded to fit)
air filter: K&N RE-0200

Keep in mind that I am not an expert on these bikes and got MUCHO help from the boys over at MopedArmy.com. Taped from an Iphone 4.

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Комментарии: 40

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Автор david doherty (1 месяц)
I thought the urban express had a governor in the cdi to restrict the
rpm's. mine hits 29 to 30mph then feels like the governor kicking in and
bumping it back down to 29. it feels restricted on any surface, flat or
downhill. I got a aftermarket cdi for it on ebay for $13 gonna try that out
when it gets here. have you upgraded yours? does it make a difference?

Автор Matthew Forster (3 месяца)
So +jcterzin what did you do for a kickstand? I added the same muffler,
but am kinda stuck on what to do about a kickstand.

Автор TheScooterdude80 (5 месяцев)
I'm rockin summertime on my urban express.

Автор MemorysMystic (6 месяцев)
You have to tune the carb with new jets. The air filter won't do a whole
lot if you leave stock jets in the carb.

Автор TheScooterdude80 (8 месяцев)
yeah,I have 1 Iowa urban deluxe,and 1 regular urban deluxe.The deluxe part
just means I have electric start and a bigger battery.

Автор safe biker (2 года)
you need a boost bootle on your bike it should make your bike do 40mph or
more i got my pocket bike to do 48 mph with a boost bottle

Автор jcterzin (9 месяцев)
I don't believe so. I don't think you can mess with the variation on the
IOWA editions, though I could be wrong.

Автор heygianni (2 года)
Awesome! I'm doing the same thing in the summer. Thanks for the insight.

Автор jcterzin (2 года)
The outer diameter on my carb, which I'm quite sure was the original, is 1

Автор jcterzin (9 месяцев)
magically! :)

Автор lukethekanefan (2 года)
the filters giving it more air the exhausts helping get the gasses out and
thats has made the diffrence but change the carb jets so it gets more
petrol to take advantage of the mods on the bike it shud ggive an extra 5
mph to 10mph to the 10mph you LREADY GOT

Автор joe muncey (1 год)
did you try useing three variator weights instead of six? i have and it
helps restore bottom end power

Автор jcterzin (1 год)
yea, it does help too

Автор jcterzin (1 год)
My BX31 does decrease power on the low end, so my acceleration is less now
from the stops. I like the Top end increase though, especially with the new
exhaust to add power.

Автор Armin Prnjavorac (1 год)
that "audience" is so annoying

Автор James Crabtree (1 год)
where'd you get the exhaust?

Автор jcterzin (1 год)
holy crap dude! Does it feel like it's going to explode?

Автор Tr3v0rUnKn0wN (1 год)
nice MGS1 music :p..

Автор vinnycarr (1 год)
How do you un-weld something ?

Автор pizzasluter3652 (2 года)
sorry it dose 45mph now not no

Автор jcterzin (9 месяцев)
How'd you guess?

Автор TaystieNaydes (1 год)

Автор jcterzin (9 месяцев)
yes! It did help. The whole variator was covered in old grease so I cleaned
it out as well and replaced that grease with graphite lube.

Автор jcterzin (1 год)
Yes, I've been real careful to monitor and check my plug for signs of
lean-ness (for lack of a better term). So far the bike has been running
pretty well without having to worry about it, but I think in the next month
I will add a larger jet and test it just for kicks.

Автор kellsarah (1 год)
I'm not remembering the number for the belt, but every year I change my
belt with a cheap Mastercraft belt from Orielly, it runs about 6 or 7
bucks, and with a fresh belt and everything else stock I get 32mph. I
usually know it is time change out the belts when my top speed is only
28mph. I bought 2 Urban Expresses in 2009 one only had 1200 miles on it,
and they both had been parked since 1991. I ended up selling one because my
wife didn't enjoy riding them, but I still have the other.

Автор James Wicks (1 год)
I have an Urban Express 1982, I have stripped it of its original front and
back fenders. I added an after market exhaust that I picked up online for
60 bucks. I cleaned air filter and tuned brakes. I use Amsoil premium
2stroke interceptor oil. After I put the new exhaust on I tuned the
carburetor. The little thing does 40Mph top speed.

Автор joe muncey (2 года)
i regret my last comment , my belt just snapped , how well dose the BX31
track on the drive faces ? dose it decrease bottom end power? im concerened
if i get the BX30 it will fall off

Автор Evan Warren (2 года)
great video! very in depth. im looking to up my nu50 as well. im ordering
the DR 70cc kit but i also would like to get a new air filter (i dont have
one right now). what size was the flange on the carb so i know what size
filter to get?

Автор Chris B. (1 год)
Sir this is amazing. I'm buying one but I think the motor is shot, If I can
bring it back to life, Im doing these mods, if not im just frankensteining
a 150cc motor in it

Автор TheScooterdude80 (10 месяцев)
Is your bike the urban express Iowa?

Автор 93sundance (1 год)
I got one of these new back in 1983 and it would top out at 35mph all day,
a steep hill I could do 38. It was governered to 35 but it felt like it had
more. If you did all those mods just to get to 34 then seems to me there is
a mechanical issue.

Автор Brian Jones (2 года)
Px malossi race gears and makuni 22mm carb, honda mb5 .004mm reeds, notch
variator, 6.5g roller weights, malossi 70cc kit, proma exhaust, and some
secret tuning skills.... gps @ 68mph..

Автор mcfrisbie (1 год)
I've had one of these on and off since 1984. Lots of fun and much cooler
looking than any scoot made today. I do recommend you make sure your brakes
are in TOP shape. The cables stretch and sometimes stick and they weren't
engineered for anything more than the minimum speed so BE CAREFUL (and have

Автор jcterzin (9 месяцев)
no, its still good to go! Just be sure to check the fuel mixture and make
sure it's not running too lean or rich.

Автор pizzasluter3652 (2 года)
i went all out on my nu50 it dose 45mph no i put my hole tax return in to
it in january over 650$ and it was worth every penny and taco. there is a
very poor video of mine call honda nu50m irken express that tells all the
parts i have on it. the only thing is your bike is in very good shape i am
very jealous

Автор Patrick Leonard (2 года)
You may want to re jet the carb after changing the filter, most of the
honda scooters and bikes like the express have tuned air filters and if
removed will cause the motor to run very lean and burn up a piston in a
real hurry. So you need a larger main jet.

Автор Brian Jones (1 год)
No, video on youtube... Honda nu50 dreamcycle

Автор jcterzin (9 месяцев)

Автор jortiz69mp (10 месяцев)
Did pushing it to go that fast mess it up in time.

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