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Posted on May 10, 2005, 8:38 AM from IP address 66.75.81.183
I want to make my Honda 83 Urban Express Deluxe to go faster it only goes 20 mph. i have tried cleaning the muffler but i didn't have the right stuff. But i would like to know where the governor is.
Posted on May 9, 2005, 6:47 PM from IP address 216.190.125.252
As far as I know the UExpress doesnt have a specific governor. Rather it has a half dozzen small things to keep it from reaching it's full potential.
However even with these it should still reach 32mph or so when running properly.Just because you dont have the right stuff to clean the muffler doesnt mean it's not a problem any more.
Posted on May 10, 2005, 1:08 AM from IP address 154.20.212.87
The variator pully has a restricting lip to limit top speed (see the clutch mods thread below.)
The variator weights can be changed for better acceleration under certain conditions.
The exaust port is smaller then earlier bikes (this may provide useful back pressure, have yet to bore it out and experement.)
The ignition timing isnt ment to be changed, but if adjusted could provide a little more power.
The spark plug and wire can be replaced with a non-resistive type (not the "low resistance" gimmick plugs ricer shops sell, just standard automotive wires.)
With the less resistance from above, a wider spark plug gap can be used.
I dont know if there's a rev limiter in the electronic ignition system, but if there is it could probably be defeated.
The muffler is fairly restrictive, and is only made worse after riding with a cheap oil as it tends to clog. It should be cleaned regularly with solvent, or replaced with a bi-turbo.
The carb can deliver more fuel with a low restriction K&N air filter and a bit of adjusting.
At this point I would highly suggest running a high grade two-stroke oil, possibly synthetic just to cope with the extra heat and higher RPMs and such.
I'm going to be trying to get the most I can out of an Urban Express engine shortly, so I'll post the results eventually.
Posted on May 12, 2005, 11:30 PM from IP address 154.20.212.87
I was told on my 1981 honda express there was a "travel limiter plate" on the back of the clutch, where if you remove it, it will allow for a higher stop speed. I just took the tranny cover off and took a look at the clutch and there doesn't seem to be any plate on there.... Anyone know about this clutch modification?
Has anyone done any modifications to their express? improving acceleration or top speed?
thanks
Posted on May 6, 2005, 6:33 PM from IP address 66.65.195.191
.....one with a variator,I believe, which allows the pulley to squeeze the belt and make it ride higher in the pulley,thereby giving you a higher ratio.
don-ohio (:^D
Posted on May 7, 2005, 5:00 PM from IP address 12.109.127.66
I'd be very interested in trying this when I get my Uber-Express assembled.
Can you give me a little more information? A diagram? A picture or two even?
Posted on May 8, 2005, 4:30 PM from IP address 154.20.212.87
if you take the variator apart you will see that one half has a lip at the center
the two edges of the pulley where they 'V' down never touch
by removing some of this lip, the 2 halves come closer togethere
this forces the belt to ride farther out,
which is what happens at top speed engines speed
when the your riding down the street at full speed the 2 halves of the varaitor are as close together as they can get, making the belt ride as far out as possible ( bigger pulley diameter ), but this diameter has a fixed limit set by the lip/spacer
by removing the fixed spacer/lip the 2 halves come closer togethere making effectively forcing a higer top speed.
NOW.. the bad news
you must remove a exact amount, so that you can put the exact spacer/washer on the backside of the pulley to keep everything aligned
and you will need to buy a slightly large 'v' belt to make use of the increased diameter,
buying the belt is usually a trial an error process.
so you take the old original belt to the auto store and get one just a hair longer, the same width or a hair thicker, THINNER IS BAD
repeat untill you fine the right one, the ped will run with and you are happy
then buy several quality/exspensive ? good ones, and write down the part number so you don't forget it
also this mod will slow down the take off speed from the stop light, but does a nice job of increasing top speed.
so if you live in an area with lots of hills or stop & go lights , you might not want to try it.
the good news is you can return to original performace by moving the washer from behind the variator to back inside the variator, and putting the old belt back on
TheMopedWhiz
Ride Mopeds..SAve Gas..Have Fun
Posted on May 8, 2005, 11:45 PM from IP address 66.174.90.201
I have yet to recieve my UExpress engine and tranny so I havent had the chance to look inside.
But from the sound of it this just changes the ratio slightly in one direction.
Is it at all possible to leave the washer out and adjust the mechanism to allow for a wider ratio band? Differant weights or something?
I'm more interested in better all around performance then losing one for the other.
None the less I'll consider this when I get my Uber-Express together and see how it performs. Who knows, maybe it'll go like a bat outta hell on acceleration as it is...
Posted on May 9, 2005, 3:15 AM from IP address 154.20.212.87
the spacing you remove/grind/machine must be replaced in the form of the washer to make sure the pulleys stay aligned
other wise the drive belt will be shreded in just a few days, because it is being pulled sideways and rubbing on the edge of the pullies
lighter weights in the variator will keep the variator in lower gear longer before shifting
heavier weights will shift gearing sooner
this can be done with out moding the variator pulley size/gap
in fact if the drive ratio of the variator is changed , it is better to go with heavier weights to max plate grip against the belt for max speed.
but yes when moding the variator you change the whole drive ratio
both starting and final, this is why acceleration suffers, a side benifit is even better gas mileage
if you ride miles on country lanes you will like this mod
if all your riding is stop & go in the city , you will NOT care much for it.
for the city, I recomend lighter weights in the variator and a good exhaust such as the biturbo, done properly , with a tuned carb, and you can get some real performace gains at the stop light
TheMopedWhiz
Ride Mopeds..SAve Gas..Have Fun
Posted on May 10, 2005, 12:28 AM from IP address 66.174.76.204
Just so I understand everything right...
With no washer, the low end acceleration stays the same and the belt is fine, but once it reaches top speed to make use of that extra bit it is sent too far sideways and starts to fall apart?
That part makes sense, but by putting a washer in, shouldnt the problem be reversed?
Wouldnt the plates only be alligned at full speed, and the low end/idle now be out enough to ruin the belt?
Or, does it just not matter much because little time is spent at the lower speeds?
Also, is one end of the Express's variator just a standard pully, or do they both change sizes? If this is the case I'd assume some fiddling could be done to the other end to compensate.
Yes, this will be mostly used around the city. That's why I'm hoping to find something that will give me a slight top end boost without giving up acceleration.
This will also be done along with experements with slight engine port modification, fiddling with the ignition system, carb adjustments, low restriction air filters, etc etc etc.
Posted on May 10, 2005, 1:06 AM from IP address 154.20.212.87
i have a 1985 honda nq50 and i rebuilt it and started it up, i let it idle for a while,then i tried riding it then if i open it up right away it will bogg down but if i do if very slow it will accelerate. then when i ride it for a 2 min it gets really how and i kill the motor and it starts smoking. i dotn know what to do, please help.
thanks for your time
Posted on May 3, 2005, 9:43 AM from IP address 216.120.137.67
also it IS possible , to mis-align the cylinder , when re-assembling the engine
even a few thousandths out of dead center can cause binding and excess heat
also do NOT leave out any gaskets, base or head, thinking to get more compresion & power, you will only get more heat..
when i re-assemble an engine I put the 4 cylinder bolts in ONLY finger tight
then i work the kick starter with one hand and make sure the piston is sliding in & out perfectly straight ( no cylinder bobing or wobbling ) then i tighten the bolts criss cross, you need a torque wrench when you do this, the max torque is 10 ft lbs 'Not very much '
i tighten at 6 lbs , then 8 lbs, and finaly 9 lbs
do NOT just twist them down as tight as you can get it you WILL over-tighten and tweak/distort the cylinder and cause binding
TheMopedWhiz
Ride Mopeds..SAve Gas..Have Fun
Posted on May 4, 2005, 12:15 AM from IP address 66.174.90.201
I wrote earlier about my transmission seizing up on my 1978 nc50. I opened her up and found the reduction gear bearing (which rests on the outside case of the tranny inside to have somehow gotten loose and some of the bearing rods got into my reduction and drive gear.
The chain from the clutch also seemed loose. Anyways i ordered a lot of small parts from partsfish including this chain, chain tensioner spring etc.
I don`t have any special tools, how do i remove the clutch or where can i pick up this tool to do it?
thanks
Posted on May 2, 2005, 6:56 AM from IP address 69.157.149.66
Officially you use a clutch puller. It presses against the center stud and pulls the clutch twards it as you tighten a bolt. You can often get the thing off by carefully prying on it if you have to, but the clutch puller is definatly the better way to do it.
Also, I can still spare a lot of tranny parts if you discover you need them.
Posted on May 4, 2005, 6:06 PM from IP address 154.20.212.87
You can buy it in many places. Though unless you plan to be using it a lot, I'd certainly suggest you try to borrow one first.
Otherwise you can make one yourself.
Posted on May 9, 2005, 3:08 AM from IP address 154.20.212.87
I was wondering if there was a reason my posts are not going up right away. I joined Network54 about 3 weeks ago without any problems (MBash). I've attempted to join the Moped forum 2 times but I've never received a confirming Email. I was under
the impression that members would get their posts shown immediately without moderation - perhaps my membership fell through the cracks . . . ??
Posted on Apr 27, 2005, 7:03 PM from IP address 69.230.193.213
Has anyone had any experience rebuilding the front shocks/springs? I'm doing a complete frame-off restoration on a 1978 NC50 and one of the front shocks is real weak. Can they be rebuilt and is there a kit available?
Posted on Apr 27, 2005, 5:17 PM from IP address 69.230.193.213
I have an orange 1978 honda express for sale. the bike runs perfect and the frame has some chips out of the paint. It has a new batter, new seat and new hoses for the gas and oil along with a new spark plug. It has 2194 miles and is still running strong and tops out at 28 mph. Im open to offers but would like to get around $350 for it.
Posted on Apr 26, 2005, 5:43 PM from IP address 69.111.244.66
I am desperately looking for a 70cc cylinder and piston for my 1980 Honda NC50, I do not have a credit card or a fax to buy from www.50cc.nl and am looking for one slightly used so it would not cost more than $100 (US). Any help appriciated.
Posted on Apr 26, 2005, 4:33 PM from IP address 69.205.246.50
Hello everyone-- I just purchased a '77 express. I'm topping out at about 25mph on flat streets-- sounds like it coughs a little if I have the throttle all the way open. Is there something I can do to making it run faster? The only thing I know to do is to clean the exhaust and muffler-- any suggestions would be appreciated! Thanks
Posted on Apr 26, 2005, 12:41 AM from IP address 68.102.218.201
your really only ganna get another 2 mph out of it if you do anything to it anyways
mine does the same thing and it may do it forever because smelling like gas and having dirty hands doesnt make me happy about getting 2-4 more mph out of my ped
but yeah you should by a nos exhaust ... and buy me one too while your at it
Posted on Apr 26, 2005, 6:04 PM from IP address 68.102.205.254
The stock Express is supposed to go 30-32 MPH when in proper running condition.
Cleaning the muffler, cleaning the carburetor, checking ignition timing, gapping your spark plug, all these things can help you regain the power you're supposed to have.
Posted on Apr 26, 2005, 8:36 PM from IP address 154.20.212.87
what are your guys expresses running right now?
everyday is diffrent for me depending on the weather i think
today mine was running about 26-27 after about a quarter mile
i thought i was doing decent
a few days ago i was hitting around 28-29 on every straight
i think it has something to do with the beromiter and amount of moisture in the air
this would change the amount of gas getting into he engine correct?
i noticed parts shark has brand new exhausts for something around 200$
anyone had any experience with them?
Posted on Apr 27, 2005, 8:18 PM from IP address 68.102.205.254
The ammount of air pressure will somewhat change your mixture. Not much, because of how the Express fuel system works, but a little.
However water content can be a factor, as well as temp.
At $200 for a new muffler, I wouldnt bother personally. Especially when my whole bike cost me $20.
Anyone know the cost of a bi-turbo exaust offhand? I'd expect them to be the better way to go.
And of course if you dont wanna pay that much there's nothing like a good chemical bath to clean out your muffler and getcha going again.
Posted on Apr 27, 2005, 10:27 PM from IP address 154.20.212.87
i threw on my bi turbo for about 125$
it was something like 90$ for the pipe and shipping from the netherlands or new jersey or hawaii or whereever it came from
then it was like 40$ for Midas to weld a bracket for me
biturbos are nice and i reccamend them for someone who wants a little more speed for thier ped
i just wish it didnt end up sticking out 2 feet from the back tire
Posted on Apr 29, 2005, 1:53 PM from IP address 68.102.205.254
I was wondering if high quality synthetic 2 cycle oil is OK to use in a Honda Express? Any problems with the oil injector handling the synthetic? Is Amsoil a better option?
Thanks
Posted on Apr 23, 2005, 10:35 PM from IP address 68.105.63.243
It should work just fine. If it's worth using could spark quite the debate though.
So long as you dont use cheap/generic/"all purpose" two stroke oil you tend to be okay. I managed to badly gum up my exaust with a half a quart of general purpose two stroke oil from a gas station.
Now I just use the Honda Two Stroke Injector Oil.
Posted on Apr 24, 2005, 8:47 PM from IP address 154.20.212.87
Hey all, i am interested in swapping my motor out for a bigger one on my 82 NU50. i have done the 65cc upgrade kit but i am not satisfie. have any of you ever tinkered with something like this and swapped the current motor for a bigger one? is something like this even possible?
Posted on Apr 21, 2005, 2:17 PM from IP address 131.193.6.201
The NU50 is the largest engine of that style.
I'm currently working to bolt an NU50 engine to my Express frame.
If you're looking for more power you can bolt on a bi-turbo exaust, replace the spark plug cable with a non restrictive one, fiddle with your carb, replace variator weights, adjust ignition timing, consider fuel additives, etc.
There's still ways to get more power out of that engine.
Posted on Apr 21, 2005, 6:24 PM from IP address 154.20.212.87
We finally found a rectifier for our 1982 Honda PA50 moped, now we can't find a Seal Beam 6 volt 15watt. We were told they don't make them anymore, any ideas on where we could get one or any way of getting around it. Thanks
We live in Quebec
arlene
Posted on Apr 18, 2005, 9:39 AM from IP address 142.169.72.173
I just aquired a 1981 Honda Express II NA50. I have read most of this forum and have learned alot about the bike (would only go about 10 mph and I read about how the muffler gets clogged, took it off and it runs great. In the process of cleaning it now). Anyway, the only thing I really need for it is the air cleaner assembly. It had an old nasty aftermarket cone filter which was trash. The bike is really nice and I would prefer to find an original assembly, but suggestions for an aftermarket solution would be helpful in the meantime while I find an original. By chance, does anyone here have an original assembly for this bike I could buy? I would appreciate any leads/info. Also, is the assembly in this listing the correct one?:
Our 81 Honda Express II (NA50)is burning oil. We just got it (for free!)and as it was not running, we put in a new battery, new sparkplug, and cleaned up the carb.
After adding new gas and oil, it started on the first kick. Ran great but smoked a ton. I've checked the adjustment on the oil injector pump according to the service manual, but it's still smoking out the exhaust way too much.
Any ideas? Thanks in advance.
Posted on Apr 17, 2005, 6:52 PM from IP address 172.140.73.229
The Express's oil injector tends to very slowly let oil through even when the bike isnt running. So if it's sat awhile, you've got a buildup of oil inside the crankcase.
The best way to fix this is to ride the bike a lot for the next week or so, which will do the bike a lot of good.
Have fun!
Posted on Apr 19, 2005, 4:36 PM from IP address 154.20.212.87
Well, that didn't work. It actually got worse! The oil dripping out the end of the muffler is pretty bad.
Could the oil injector pump be leaking into the crankcase as it runs? Oddly, there doesn't look like any oil is getting to the carb, the tube is empty, but not clogged. Anyone have any experience rebuilding oil pumps?
Posted on Apr 22, 2005, 12:08 PM from IP address 172.156.102.137
We had the same trouble. Oil leak between oil tank and fuel tank. Cured problem of smoke by empting oil tank and mixing oil with fuel and blocking oil line to pump.
Posted on May 28, 2005, 1:43 PM from IP address 209.240.205.60
.......you were wondering if you'd EVER get decent weather? Glad to hear you're out there! Do you know Wayne Broderick from the www.mopedriders.com site? He's in Maine. don-ohio (:^)
Posted on Apr 17, 2005, 6:26 PM from IP address 63.155.196.205
