KymcoForum.com
Scooters - Big Bore => Xciting 500 => Topic started by: bongoman on January 29, 2009, 07:24:41 PM
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Has anyone had experience with Dr Pulley rollers on the X500?
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I fitted a set of Dr Pulley sliders (they dont roll they slide ) 28gm weight..think the original rollers were 30 gm but cant find a reference to confirm this I find the motor smoother ,accelerates better from rest, ( not heaps but seems to be more tractable) accelerates better on the run 80-120kph, think the fuel consumption went backwards , dont know if this is due to accelarating more cos its fun, finally getting the speedo to read the correct speed ( and from this the odometer reading correctly), or the tyre pressure going down (which they do..cant keep the pressure up, have to pump up twice a week to avoid them losing pressure)and making it harder to get along and so use more fuel
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Hey Alex, I read the same thing about less mpg that you wrote about here, on another web site, www.scootermaxi.com (http://www.scootermaxi.com) I hope that I posted the link correctly.
Thanks for posting your experience.
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thanks for link bongoman. I have since yesterday weighed the stock rollers and found them to be 32gm I had thought them to be 30gm and ordered 30 gm Dr Pulleys which arrived as 28 gm...now that I know there is so much weight differenence it explains the fast revving, lower milage and they are coming out in favour of the stock ones. I will probably increase the weight of the Dr Pulleys and try again >:(
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On scootertrap.com the only weight listed for Dr. Pulley for XC500 are 28grams. Makes me wonder if there is a heavier weight that fits the XC500.
So you are replacing the Dr. Pulley with the stock ones? Is it because of lower mileage?
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Yeah I put the stock ones back for the time being I was getting 500rpm more at 60mph than with the stock rollers engine runn6000 rpm and fuel consumption increase of 5MPG ( I just did a short fill to get a quick comparison of DrP MPg and Stock). I expect the top speed would have been less if the engine was revving faster to get the saem speed and would eventually run out of revs
The DrP sliders had a funny wear pattern on two of them I will post a picture..two of the stock rollers have small flats worn on them about 2mm wide across the roller...probably they were doing all the work..if the trend continued they would end up looking like DrP rollers I expect ::)
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I've clocked close to 300 miles on the new Dr. Pulley sliders now. Enough miles to get a feel.
Yes Alex, fuel consumption increased some for the first tank, but then I got a better grip on how to work the throttle. It doesn't take much twist to get the same revs it seems. Now I am getting better mileage than at first, in fact, it seems about the same, around 50mpg. I know the scoot performs better, at least on acceleration and up to 75 or so.
My first impressions are that the scoot revs quicker, then when I reached cruising speed, rpms dropped back to around what they were with stock. The Dr. P. sliders really made a difference, and I had to adjust the amount of twist on the throttle for the scoot responds quite differently.
So far, I like them with this caveat; I'm not sure about passing power at interstate speeds. so far, I've been on roads that I am familar with between Austin & San Antonio. The scoot still has plenty of pull going up hill, and there are lots of them on the twisty bendy back roads around here in what' called the hill country. Great riding country.
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I found that the engine braking seemed to be less with the lighter weights, do you notice that?
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Can't say that I have noticed less engine braking.
I still like having them installed. Now I'm working on some custom touches like seat, handlebars and pinstriping.
Sure nice weather today, like spring, time to ride!!!!!!
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Thinking of putting some in a 2009 xciting 500Ri I'm a big person and would like to get off the line better what size and weight? Thank and good riding
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As far as I know, they only come in one weight, and it's several grams lighter than the stock. Look on scootertrap.com, they have them listed.
My mechanic had this suggestion for adding weight should you wish to slow the sliders down; drill a small hole in one on each side of the variator and insert a metal rod.
Once I adjusted my throttle technique, mileage went back to what I was getting with stock rollers.
Also, add some dry lubricant - DRY lubricant - to the backing plate and the sliders work smoother, expecially at slower speeds and takeoff.
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Bongoman what size will fit on the scootertrap has 1 size for the 500 28x22 at 28 grams MRP size for the 500 25x22 and weights from 18 to 30 grams any help would be great thanks
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I bought what I thought was 30gm from Scootertrap which turned out to be 28gm. I have added small pieces of copper tube inside the brass cylinders on the Dr Pulleys to bring up to stock weight 32gm. I was surprised to find that when I fitted the sliders this time they were not a loose fit like the rollers..they were loose on the previous occasion I had them fitted...all I can put this down to is absorption of atmospheric moisture and swelling of the plastic..some plastics can absorb water and swell...so I thinned them down with emery. I used microfine MO2S powder which I have had for years ...a buddy of mine worked where they made it and it was a sample
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so have you tried out the Dr Pulley sliders with the extra weight? How do they compare with the stock sliders? I mean the stock Dr Pulley sliders that are 28g.
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dont know yet, the scoot is not being ridden until I get some new mirrors, one got broken and I am not riding again until I get a replacement set which are on order. I come and go to work in the dark so its no fun without mirrors
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new mirrors fitted , back riding again..drylube and Dr Pulleys are great, quicker pickup, smoother
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Glad you're back on the road. After you get used to Dr. Pulley sliders, they are nice
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Alex, earlier you said you put the stock rollers back in and I take it since then put the Dr Pulley back in. Are these the same Dr Pulley you started with? You said something about trying to add a bit of weight to them. Did you do this or just leave them at 28 gram? I am considering the Dr Pulley. I did the change in our Scarabeo 500 and wife is quite happy with the result. She said it may have taken a little hit on MPG, but it still gets close to 60 MPG. She rides the Scarabeo, I ride the X500 and like the smoother take off it gave the Scarabeo and it looks like it would do the same for the X500. However, can you give me an idea of what it did to the gas mileage. I also read in one of the posts (can't remember who said it...) that gas mileage came back up a bit after they got used to riding it with the Dr Pulley and eased up on it a bit. What about highway speeds, does the RPM catch back up when you get to cruising speed? I tried asking these questions to my wife about her Scarabeo and she says she never paid any attention to that stuff she just rides it and likes the smoothness and extra pep.
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Hi Winginman,
I have had Dr Pulley sliders in my X500 for about 6k miles now. I highly recommend the use of a dry lubricant like graphite when you install them.
As to mpg, mine took a hit of about 2 or 3 mpg at first, then when I adjusted to the quicker, smoother take off and quit rolling the throttle so much, my mileage came back. The dry lube gives a really smooth take off, especially at slow speeds like in a parking lot.
And highway, that's where I noticed the biggest change. Rpm went up a bit, but I think it's because the engine is not working as hard. Accelerating from 55 to 65 makes the rpm shoot up, but then like another gear, when speed is reached, rpms go down some. At speeds, the engine sounds like it's running easier.
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Bongo, thanks. I think I will try the Dr Pulley. May take a few weeks. I am tied up this coming weekend and will have to order the sliders from my local dealer anyhow.
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Hey Winginman,
You can get Dr Pulleys from www.scootertrap.com (http://www.scootertrap.com) for $50 including shipping. And they ship quick.
They come in one weight only, however, some on this forum have added weights by inserting small rounds of metal in a couple. You can find their posts with all the techy stuff.
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Have you tried them yet? I am still loving them in my X500.
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:)any up date?
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Here's my update on Dr. Pulleys, an $1800 update. First make sure they are genuine Dr. P because there are some copycats that will fail. Also, they have to be installed just right, not much margin for error. In my case, the tech missed a thing or two and the whole drive train had to be rebuilt. I like OEM now.
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Hey Alex - you wouldn't happen to still have the little black plastic cap that goes on the mirrors would you - I lost mine. If you still have it - then let me know how much you'd like for it.
Bongoman - maybe we should go for a scooter ride and trade back and forth so you can feel the difference between stock and the sliders. Do you have the stock screen or the Givi? I didn't want to go to a big screen - but the wind noise is starting to get to me... I'm north in Avery Ranch - where are you?
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Hey Guys,
It was quite interesting reading your conversation. The fun part was I have no idea what Dr. Pulley rollers are or where they are installed and what the are supposed to do. If you have the time and don't mind. Please give a quick run down. Thanks, Kymcorider
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From what I've been reading, My personal decision is to leave the fat scoot stock. I am a firm believer in mods, but it seems as if things can go wrong with aftermarket parts. I am happy with the performance of the x500 and would rather have longevity ;).
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Got about 5000 miles on my Dr Pulley in my 09 X500. Yep, you loose a few MPG due to higher RPM taking off and in most speed ranges. Top end is basically the same it seems that the rollers reach the same position on top end just takes a bit longer. I have the tall Givi and that affects top end more than anything. The difference in performance and smoothness of take offs more than offsets the few MPG I lost.