Urban express variator questions

Shawn Manthey /

I got an 82 nu50 that I'm trying to squeeze all the beans I can get out of it. Currently it tops out at 40. 42 if I put the sail up and the wind is right. I have a Dr 70 kit with vm18 carb. 85 main jet 17.5 idle. I ran it with my modified belt cover on it so I can see where the belt is riding on the pulleys and I noticed that it rides a good 1/4 inch from the top of the variator pulley. I have tried anywhere from 20 grams in the variator to 40 and it doesn't make a difference as far as where the belt rides at WOT. I currently have a fairly new bx31 belt. Is there anything that I can do to get the variator to push the belt a little further out on the pulley and give me some more top speed? Also running yellow contra and yellow springs in the clutch with Malossi gears. Thanks

Re: Urban express variator questions

Before the suggestions fly in, you're sure the belt has room to travel further? That is, it's not bottoming out on the rear pully, and being constrained by its own length, correct?

Re: Urban express variator questions

One thing u can do is flatten out the outer front pulley with a hammer. Do it a lil at time tho, cuz it will really change variation alot and will cost u some serious midrange. (Wayne your not allowed to comment on this)

Re: Urban express variator questions

> David Cox Wrote:

> -------------------------------------------------------

> One thing u can do is flatten out the outer front pulley with a hammer.

> Do it a lil at time tho, cuz it will really change variation alot and

> will cost u some serious midrange. (Wayne your not allowed to comment

> on this)

Whatever you do don't listen to either of the Cox Brothers on tuning the variator, you can read the other threads and everybody keeps trying to explain to the Cox Brothers that they're doing it wrong..

The biggest red flag is the fact he's telling you to beat on Parts with a hammer.

Alex, Captain January, DCP Ryan will give you real information I suggest that you look up their profiles and post to see what they did to make things work.(edited)

Re: Urban express variator questions

I personally do not run it that way, just a quick way to make belt ride higher to see if it will pull more gear ratio. As long as u have a replacement to put back on if u hate the trade offs like i did. But it did give some sick gear ratio on the top. Right at 70mph. Wayne, can we be friends one day u reckon?(edited)

Re: Urban express variator questions

Dam you're pretty desperate you've pissed everybody that knows these NU50s inside and out on this form that actually tried to give other people the right advice so I wouldn't bet on us being best friends.

Re: Urban express variator questions

I know these nu50s better than anyone, trust me, i get plenty if personally messages askin questions. U can make fun, but if anyone rode my bike, they would wish they owned it.

Re: Urban express variator questions

Thou protest too much.

Quote from Shakespeare's Macbeth

Re: Urban express variator questions

Shawn Manthey /

> alex ganz Wrote:

> -------------------------------------------------------

> Before the suggestions fly in, you're sure the belt has room to travel

> further? That is, it's not bottoming out on the rear pully, and being

> constrained by its own length, correct?

It looks like the belt only rides about half way down the rear pulley. I will double check and see if the rear pulley isn't binding up somewhere.

Re: Urban express variator questions

Shawn Manthey /

> David Cox Wrote:

> -------------------------------------------------------

> One thing u can do is flatten out the outer front pulley with a hammer.

> Do it a lil at time tho, cuz it will really change variation alot and

> will cost u some serious midrange. (Wayne your not allowed to comment

> on this)

I might give that a shot. I have an extra plate I can try it with.

Re: Urban express variator questions

Or notch the variator, but there is alot of tuning involved. Try the other to make sure engine can pull that much ratio first

Re: Urban express variator questions

Shawn Manthey /

It seems to run best with around 23 grams in the variator. Loads of power all the way to 40 and then that's all she wrote

Re: Urban express variator questions

SR OR Malossi gears will alot

Re: Urban express variator questions

Dirty30 Dillon /

> David Cox Wrote:

> -------------------------------------------------------

> I know these nu50s better than anyone, trust me, i get plenty if

> personally messages askin questions. U can make fun, but if anyone rode

> my bike, they would wish they owned it.

You really busted out the humble brag about PM's? Damn.

OP: Is there a specific reason you swapped contra springs?

Re: Urban express variator questions

> Dirty30 Dillon Wrote:

> -------------------------------------------------------

> > David Cox Wrote:

>

> > -------------------------------------------------------

>

> > I know these nu50s better than anyone, trust me, i get plenty if

>

> > personally messages askin questions. U can make fun, but if anyone

> rode

>

> > my bike, they would wish they owned it.

>

> You really busted out the humble brag about PM's? Damn.

>

> OP: Is there a specific reason you swapped contra springs?

Fuckin bitch troll

Re: Urban express variator questions

Shawn Manthey /

> Dirty30 Dillon Wrote:

> -------------------------------------------------------

> > David Cox Wrote:

>

> > -------------------------------------------------------

>

> > I know these nu50s better than anyone, trust me, i get plenty if

>

> > personally messages askin questions. U can make fun, but if anyone

> rode

>

> > my bike, they would wish they owned it.

>

> You really busted out the humble brag about PM's? Damn.

>

> OP: Is there a specific reason you swapped contra springs?

Swapped contra spring to get my rpms a little bit higher before it variates. Is it possible that the spring is just to stiff causing it to not let me fully get into high gear? I checked the rear pulley last night and everything is moving freely, not binding anywhere.

Re: Urban express variator questions

Shawn Manthey /

> Derek Cox Wrote:

> -------------------------------------------------------

> SR OR Malossi gears will alot

Will alot what?

Re: Urban express variator questions

> Shawn Manthey Wrote:

> -------------------------------------------------------

> > Derek Cox Wrote:

>

> > -------------------------------------------------------

>

> > SR OR Malossi gears will alot

>

> Will alot what?

Will help your top end alot. U can also put a 90/90 -14 tire for a bit more mph as well. These two things should get u tp 50mph without cutting variator(edited)

Re: Urban express variator questions

Shawn Manthey /

When I put the malossi gears on, I might have got a couple mph. Like 38 before 40 now

Re: Urban express variator questions

> Shawn Manthey Wrote:

> -------------------------------------------------------

> When I put the malossi gears on, I might have got a couple mph. Like 38

> before 40 now

Oh, we didnt see you had them already, thats what happens when u get old. Notching variator is an option but that will require some serious time tuning to get it right. Search on here and see if your up to the task.

Re: Urban express variator questions

Hay Cox breath you want to help this guy help him don't backpedal.

You brag how you can fix these things inside and out now help this man.

I know you're a poser and many others do too but I'm going to watch and see what happens.

Don't just lead this guy down the trail till it forks in 100 different directions.(edited)

Re: Urban express variator questions

You don't run a stiffer spring to delay pulley movement, you run lighter weights.

Re: Urban express variator questions

> DPC Ryan Wrote:

> -------------------------------------------------------

> You don't run a stiffer spring to delay pulley movement, you run lighter

> weights.

But Mr Cox knows everything how could he possibly be wrong you're wrong Ryan you're wrong.

Captain Janeway is wrong J,Bot is wrong Ben is wrong......,..

Every person on the planet Earth with one of these bikes does not know what to do we have all been doing it wrong and Mr Cox is going to show us how wrong we are.

Soon you will be showing us how to put five Springs in there.

I just don't understand how I can modify the stock exhaust on the exact same bike and give it some light porting with a little bit of tuning on the variator with what I do and the bike goes over 40 miles an hour how can that be how can that be.

Then we built another one with just a little sha and a custom intake plate reeds.

Dr kit and a pipe and the NU50 goes over 50 miles an hour all my god were doing something wrong the bike is going too fast.

What are we doing wrong how come our bikes are going so fast with so little.

I bet when you get this guy's bike going it'll go over 100 miles an hour with just a quarter twist of the throttle.

I know you can do it Mr Cox because you claim you can and we all know you wouldn't lie or brag about something that's not the truth.

Re: Urban express variator questions

> Swapped contra spring to get my rpms a little bit higher before it

> variates. Is it possible that the spring is just to stiff causing it to

> not let me fully get into high gear? I checked the rear pulley last

> night and everything is moving freely, not binding anywhere.

Short answer, yes, this is possible. Once the engine makes sufficient power for the centrip. force of the var. weights to overcome the resistance of the contra, the bike begins to variate. The power should be there (esp. with the DR), and the BX should have enough slack (~24mm linger than stock if I remember correctly). Unless DPC or CW has a quick answer, some additional info may be required.

- Swap in the stock spring? Any better?

- Make sure the faces of the var. and pully are clean; can't imagin a rough spot halting variation, but clean parts never hurt.

- Does the rear pully fully open? i.e. There's not gunk jammed into the pully guide pin-holes, right? Side note: I made a thread a while back on modding this to open further (and if you read it, yes, CW and DPC are correct).

- Never happened to me, but I've heard of odd instances where the contra can experiance enough torsion to unseat/jam; unlikly that you wouldn't notice, but figured it was worth mentioning (make sure this isn't happening).

- Finally, did you clean out the variator? i.e. Are you sure the roller-weights are making it to the end of the ramp? I take all the nasty grease out of mine; on one that I purchased, there was dirt and crap on the ramp-plate (and var. boss; pretty much everywhere).

I'm interested in this one now; please report back with findings. :D

Re: Urban express variator questions

Captain Janeway /

> Swapped contra spring to get my rpms a little bit higher before it

> variates. Is it possible that the spring is just to stiff causing it to

> not let me fully get into high gear? I checked the rear pulley last

> night and everything is moving freely, not binding anywhere.

Did you by chance pull that front gear on the crank and is the variator bumping up on it? I'm sure you'd see it, but I can't see it opening all the way up if the gear's in the way.

For the hell of it, try another belt. You never know.

Re: Urban express variator questions

Shawn, u should be doing around 45 with that setup as it is, do u have any idea what kind of rpm u are getting out of it?

Re: Urban express variator questions

> alex ganz Wrote:

> -------------------------------------------------------

> > Swapped contra spring to get my rpms a little bit higher before it

>

> > variates. Is it possible that the spring is just to stiff causing it

> to

>

> > not let me fully get into high gear? I checked the rear pulley last

>

> > night and everything is moving freely, not binding anywhere.

>

> Short answer, yes, this is possible. Once the engine makes sufficient

> power for the centrip. force of the var. weights to overcome the

> resistance of the contra, the bike begins to variate. The power should

> be there (esp. with the DR), and the BX should have enough slack (~24mm

> linger than stock if I remember correctly). Unless DPC or CW has a

> quick answer, some additional info may be required.

>

> - Swap in the stock spring? Any better?

>

> - Make sure the faces of the var. and pully are clean; can't imagin a

> rough spot halting variation, but clean parts never hurt.

>

> - Does the rear pully fully open? i.e. There's not gunk jammed into the

> pully guide pin-holes, right? Side note: I made a thread a while back

> on modding this to open further (and if you read it, yes, CW and DPC are

> correct).

>

> - Never happened to me, but I've heard of odd instances where the contra

> can experiance enough torsion to unseat/jam; unlikly that you wouldn't

> notice, but figured it was worth mentioning (make sure this isn't

> happening).

>

> - Finally, did you clean out the variator? i.e. Are you sure the

> roller-weights are making it to the end of the ramp? I take all the

> nasty grease out of mine; on one that I purchased, there was dirt and

> crap on the ramp-plate (and var. boss; pretty much everywhere).

>

> I'm interested in this one now; please report back with findings. :D

Then I must be doing it wrong according to Mr Cox because I like to grind the spring until I can run my weights in the 16 to 19 gram range.

I have my secret spring part numbers but I can also modify a spring to do what I want it to do.

I run very soft country Springs just enough so the belt won't slip but shift cleanly.

But I don't know what I'm doing only Mr Cox knows what he's doing I guess I did this wrong when I molested this spring.

IMG_20170927_114937.jpg

Re: Urban express variator questions

Shawn Manthey /

> Captain Janeway Wrote:

> -------------------------------------------------------

> > Swapped contra spring to get my rpms a little bit higher before it

>

> > variates. Is it possible that the spring is just to stiff causing it

> to

>

> > not let me fully get into high gear? I checked the rear pulley last

>

> > night and everything is moving freely, not binding anywhere.

>

> Did you by chance pull that front gear on the crank and is the variator

> bumping up on it? I'm sure you'd see it, but I can't see it opening all

> the way up if the gear's in the way.

>

> For the hell of it, try another belt. You never know.

I have tried to pull the front gear to put new crank seals in but she won't budge. I can see the outlining of the gear on the variator when I pull the variator off. So I assume it is moving all the way out. Unless that's the issue and it shouldn't be hitting it?

Re: Urban express variator questions

Shawn Manthey /

> David Cox Wrote:

> -------------------------------------------------------

> Shawn, u should be doing around 45 with that setup as it is, do u have

> any idea what kind of rpm u are getting out of it?

I have no idea but it sounds like it's screaming.

Re: Urban express variator questions

Your final gear won't be out, it will be in so whether it contacts the gear isn't important for your particular issue.

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