Dr Pulley 20x12 14GR

[TANWare]

At speed the RPM's do increase more with the sliders and WOT than stock. Rolling acceleration is enhanced somewhat...............

[Cortez]

At speed the RPM's do increase more with the sliders and WOT than stock. Rolling acceleration is enhanced somewhat...............

Good!
It's dead 2up between 55 and 65. 

[Cortez]

Will be a while until I put them in (3ft of snow..), but everyone likes pics!



Got these for $40+shipping from http://www.buggypartsnw.com/ in
3 weeks, half way around the world. They were recommended by the
Pulley guys over e-mail so..

[TANWare]

these are 14GR's?

[Cortez]

these are 14GR's?

Yeah, 15gr wasn't available from these guys at the moment and I haven't found anyone
detailing the revs vs speed for 15s like you have for 14s so.. I just went that route.

I guess they'll be ok.

[axy]

Yeah, 15gr wasn't available from these guys at the moment and I haven't found anyone
detailing the revs vs speed for 15s like you have for 14s so.. I just went that route.

I guess they'll be ok.

Imagine if they are too high... or too low... all that unnecessary consumption.

[Cortez]

Imagine if they are too high... or too low... all that unnecessary consumption.

NOT FUNNY!  

I've already had nightmares in which the engine was spinnin' at 5600 revs and
it should have been at only 5500 revs.. and the guys at the fuel station were
laughing out loud and pointing at me.. and I couldn't find my mommy!

 

It all ended in horrible pain of selling the scooter and buying a VW Golf diesel..

[zombie]

"It would be great if the CVT on the bike can be set up in a way that it will allow over 6000 (like you have now) at WOT under 60mph,
but bring the revs down by at least 300-500rpms around the bikes top speed, would make it possible to run the bike at high speeds for
longer without having to worry about pushing the engine too far."

I found this statement at the beginning of this thread. It seems to have been a constant question here.
The only way to achieve this is to go w/ an "over-range" variator, and longer belt. You will have to ask each Manufacturer for the O.D. of their Var. and use the largest one available. Your slider/roller set up will remain the same but you will get higher top speed w/ less rpm's. We do it on the 50cc scoots to trick them into thinking they are bigger. My current var. is 10mm larger, and added 8-9mph wot at the same rpm as the stock var.
Changing rollers by 1gr@ = 350-500rpm    So a bigger var and your rollers = more top end, and lass strain at cruise, as you can lower the cruise rpm's w/ rollers, and still have more gear for the top.   "Over-range"

One final thought... There are not many ready made over-range "kits" Avail. so you may need to adapt a larger Var from another model scoot. As long as the drive bosses are the same I.D., and the face angle's are the same. Belts will be hit or miss as the stated size is not actual but based on application so some cheap belts to dial in the size, untill you find the right one. I imagine the person that finds the "formula" would be quite popular here.    I'm using a Var. made for a Rukus that had a 15mm ID drive boss w/ a 20mm OD. My 14x20mm boss did the trick. 

I'd sure like to see one of you guys nail this.

[TANWare]

Actually for just 6,000+ RPM you would want the 15gr sliders. The 14gr acutally under WOT at 60 MPH is holding to the 6,500 or so RPM or is starting to let the RPM's slide up at that point. The advantage of the sliders is their profile at cruising speeds.

This profile when at cruising load extends the slider from 20mm to apr 27mm over the stock 23mm. this alows at higher cruising speeds the RPMs to drop but because of the 14gr over the 15.5 stock gr weight the RPMs are ballanced more toward stock levels when crusing. I can tell you from experience on level cruise at 65 MPH it revs between 100-200 RPM lower but go up a hill and it will rev higher than stock.

The heavier 15gr would lower the RPM even more but you would loose alot of the roll on punch added by the 14gr sliders. Personally I weight 240+LBS and that exra punch is well appriciated. If I were a trim 150 pound lad the 15gr may be my preference but alas I am not.

Now 240 over 150 is not much in a heavy car or even heavier bike but here it makes the all up weight increase by over 16%. This is alot of extra load and there but is a heavy performance hit or something else needs to be done. Now where my 0-60 times have decreased to the 9's or so at my weight they would most likely be in the 7's if I were 150 or so............

[zombie]

My wife damn near killed herself on my ZX. She weighs 110-115...

[Cortez]

Ok!

I've done it.
Had the sliders put in 2 days ago, just managed to do a quick ride and gather
a few impressions.

The bad: Cruising revs at 45-55mph are higher then before, and that's where I tend to
spend over 50% of time. I've got around 400 revs more then before. Not that big of a
deal, but will probably take the MPG numbers down.

The good: Well, everything else, really. The acceleration from zero is a lot better.
I've had about 10-10,5 seconds to 62mph before (I was 10lbs lighter, had no topcase
and topcase mounting kit then) and I've clocked it at 9 seconds now, WITH a huge
topcase and my ass getting fatter by the minute.

Acceleration from 60mph and up is a lot better too.
Long story short, the bike will rev 300-500rpm more in any given situation at WOT
and that usually makes a big difference considering it's now usually accelerating at
6500rpms or more, and it used to average around 6000.

Cruising revs at 60mph are the same (5500rpm), and at around 65 they start going
down (compared to stock weights). I've got it up to 90mph once and I think I saw
7700-7800 rpms. It was way before 8000 before.

I've had a different DT300 top out at 95mph @ 8700 revs once, I'm sure I can do
that on mine @ less then 8300 now.

All in all - all scoots should come with Dr Pulley sliders as standard.

Here's the video comparos:

STOCK:


DrPulley ( probably around 25lbs more on the bike and a topcase that's catching wind):


Questions?

[zombie]

Just an observation... If you went 1gr heavier@ you would keep all the benefits, and bring your rpm's back where you are used to them.
Maybe you guys could set up a "swap & shop" for gently used rollers/sliders. 40.00 bucks per set hurts when you are trying to dial it in.

[Cortez]

Just an observation... If you went 1gr heavier@ you would keep all the benefits, and bring your rpm's back where you are used to them.
Maybe you guys could set up a "swap & shop" for gently used rollers/sliders. 40.00 bucks per set hurts when you are trying to dial it in.

15gr sliders wouldn't rev the engine out to 6500-7000 at WOT, and I needed that more then
the low revs at low speeds. The bike feels more responsive, and just slightly more buzzy.

I actually expected it to be far worse and that I'll end up banging my head against the wall
and wanting 15gr sliders, but I'm happy with my choice, especially for going fast. I was
cruising for some 15 minutes today @75mph and at 6500 (7000 before) it's just spot on,
and I usually don't go over that.

Considering the bike had problems going over 7800rpms today, which is 200rpms short of
maximum power output, I'm guessing I'd loose some top speed with 15gr sliders since it
would rev even less.

I'm still hoping it would go over 8000 after some more break-in.. I'm at 600 miles now, ready
for first oil change. Going over the top expensive synthetic.

[Cortez]

One other thing, I just got 53.5MPG on the last tank, had 3 tanks of 47MPG, but cold weather
and all city riding. Considering half of the last tank was with the sliders, 500 rpms higher most
of the time, and some spirited riding on some twisty/hilly roads, the MPG drop is interesting, but
the weather finally got better.

[zombie]

Well then... You are on the right track. It's not easy getting it right the first time out! The Synth. oil, and good old fine tuning will get you spot on.
Before I marry again I think I will ask you for input...