Re: NU50: Modification of the Rear Pully

Captain Janeway /

> Neil Rayborn Wrote:

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

> I have a lot of Mill bits I picked up in an auction just let me know

> what style you did and I will send some along with the part it will

> destroy them take care.

>

> And by the way the MA Hotel move me to another room so they can fix the

> leak in the shower so I'm in room 420 cough cough.

lol. Totally don't get all the conceptual stuff behind what you and Alex and a couple of others do, but I love reading about it. Occasionally the light dawns

Re: NU50: Modification of the Rear Pully

Shawn Manthey /

> Crazy Wayne Wrote:

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

> If you want to be able to tune again perfect get this it's for jog and

> and zuma it gives you three different angles of slots to tune with

>

> https://cdn.shopify.com/s/files/1/1011/2432/products/pulley_d9366dc6-b3c9-4210-a453-39d35562d21b_2048x.JPG?v=1527342126

>

> https://scooterswapshop.com/products/ncy-zuma-jog-secondary-pulley-slider

Was looking into this for something to tinker with but for future reference. It will not just bolt on. Under further research the one for the jog in the link has a 33 mm bore and the urban express is a 34 mm.

Re: NU50: Modification of the Rear Pully

^^ If you're going this route, I'd recommend purchasing the entire GY6 pulley assembly anyway, as the NU50 only uses 2 guide pins (as opposed to 3). The bore of the ID should be close enough to bolt on, and the extra +1mm in diameter should have a de minimis effect on top speed. CW's post is focused on the variety of angles available for this setup (which, on top of those already stated, is a big perk to the GY6 over the DIY method).

Re: NU50: Modification of the Rear Pully

Jack Rutherford /

Damn that sounds like a lot of work. How many hours?

Re: NU50: Modification of the Rear Pully

Jack Rutherford /
stage6.png

It was glossed over in this thread but this Stage6 clutch is the cat's meow so I will revive this post. I need to get the red springs but it makes a huge difference on take-off. I've got it engaging at 5000 or so rpms and with the red springs (where did the GY6 engage - maybe 2500rpms?), I should be able to get it well above 6000. I guess I should mention that you can change and adjust the springs without taking the clutch off the bike and if you get their clutch bell, you can do it without taking off the clutch bell.

Of course, it adds another variable to trans tuning. The more I preload the springs, the more it moves around my rpms/speed. I was hitting 42 mph at 7700 rpm and now I hit 37 at 7700 rpm. (edited)

Re: NU50: Modification of the Rear Pully

Nice setup! Where did you find the QMB/GY6 50 Stage6 clutch for sale?

Re: NU50: Modification of the Rear Pully

Jack Rutherford /

Clutch

Red springs

I’m hoping my red springs show up soon.

This video cinched it for me.

(edited)

Re: NU50: Modification of the Rear Pully

Jack Rutherford /

The red springs on the Stage6 clutch launch me at 6000 rpms. I could adjust it some more and maybe get it to 6500 rpms. They make some extra stiff springs if you want more. If you wanted, it would't take much to pull a wheelie with that launch.

The jog rear pulley half will require some machining to work - darn it - but we'll get there. I was hoping to eliminate the lag and drop in rpms that occurs around 20-25 mph with it. (edited)

Re: NU50: Modification of the Rear Pully

Jack Rutherford /

I dropped the weight in the variator 3 grams and that helped more with take off and a lot of the lag around 20-25 when it feels like it “shifts” is gone as it doesn’t drop much below 7000 rpm there. Peak rpms are at 9600 or so. I may go from stock belt to malossi belt.

Re: NU50: Modification of the Rear Pully

Jack Rutherford /

GY6 vs. Stage6 clutch

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