Lighter rollers?

[de dee]

Eu moro no Brasil e n tenho facilidade em adquirir peças para essa modificação

Comprei rolos de 15G e atingi 168 KMH de velocidade final m as gostaria de ter a RPM reduzida para economia de combustível mas com velocidade final maior ..

Como você na sua scooter e onde comprou as peças ?



I live in Brazil and I can not easily buy parts for this modification
I did my own grinding to modify the variator pulley with a 1/2 " band sander, now I see Malossi has made the same modify to there vaiator,  as you get more range on the variator you have lower RPM and less power for top speed,  is your top speed by the speedometer , or on a GPS,.  168 Kmh.  wow,!!!
I bought 15G rolls and reached 168 KMH of final speed but I would like to have the RPM reduced for fuel economy but with higher final speed ..

Like you on your scooter and where did you buy the parts?

[kneeslider]

How about TechPulleys?

They are supposed to be the next generation of 'sliders'.

[Stig / Major Tom]

How about TechPulleys?

They are supposed to be the next generation of 'sliders'.

Can you post a link to TechPulleys? Not finding it.
Thanks
S6

[kneeslider]

There you go Stig.
https://www.techpulley.com

Can you post a link to TechPulleys? Not finding it.
Thanks
S6

[Stig / Major Tom]

There you go Stig.
https://www.techpulley.com

Thanks!
Oh yeah, have seen those before.

Stig

[CROSSBOLT]

So what makes them any better?

[de dee]

 
2011 downtown 300i.,  87,000 Km. so far., removed the Shendengen SH 232-12 7.3   reg . because it was putting out 18 volts   installed a reg - 14  ked9  d406     ,  it is much lighter in the fins for cooling started up ran for a hour then quit checked the reg it was very hot, I will try it again after it cools,  to see if it runs again,  put the diagnostic on it and all looks normal,  wish I new more about diagnostics  read outs,.    I can build a house but electronics is over my head, 

[de dee]

2011 downtown 300i.,  87,000 Km. so far., removed the Shendengen SH 232-12 7.3   reg . because it was putting out 18 volts   installed a reg - 14  ked9  d406     ,  it is much lighter in the fins for cooling started up ran for a hour then quit checked the reg it was very hot, I will try it again after it cools,  to see if it runs again,  put the diagnostic on it and all looks normal,  wish I new more about diagnostics  read outs,.    I can build a house but electronics is over my head,

  it started up like it was a new scooter, did not ride it as the rain is falling with hail we are getting snow again to night,  spring may be next month? no flowers showing,  to cold ,.   

[scooterfan]

I'm considering lightening the stock rollers on my 2011 DT300 to have more RPM at lower speeds. Has anyone out there done it?

Opinions pro and con?

Looks like another way to have more RPM (and more power) at lower speeds would be to install shims between the variator bush, and outer half of the variator pulley. Complete sets of different size variator shims are available for other model scooters, maybe complete sets of shims will be available for these models as well ?


By using shimms at the Variator, the slightly wider variator pulley actualy allows the belt to be at a lower position - and allows the belt to be in a  higher position at the clutch pulley during take off. This obviously will cause more RPM, and more power during take off.


The only downfall though - aparently top end speed seem to be lower after a modification like this.
Care must also be taken that not too many shimms are used - when the pulley becomes too wide, the belt will start getting in contact with the center bush, and the belt will start slipping.

I think  modifications like this might work quite well, but special care must be taken not to use too many shimms. The reason being - when the belt starts getting worn, (thinner) the pulley might be too wide, the belt will start rubbing against the  bush, and the belt will start slipping.

[KymcoRockr]

So what makes them any better?

Marketing. Again, companies like Honda, Yamaha, Kymco, etc do have R and D departments. And by now someone probably told someone who works at one of these companies about Sliders. Those companies may have even tried to develop a better design than the classic roller. It's a fairly cheap part, and if it gave their models an advantage, they probably would have considered adopting a different design. 20 years before Dr. Pulley a company in Italy started selling a slider. Despite how much better they are than rollers on the internet, every single scooter manufacturer in the world doesn't use sliders in their new bikes. None of the manufacturers of performance variators that have an active racing program use sliders.   
One thing to consider when tuning your variator is that the ability to get out of the way quickly is as important to your safety as the ability to brake properly. When you try to lower the rpms at a given speed, you give up some of that ability.

[stuo]

The rollers arrived and six were perfect at 13.0 grams, one was 12.9, one was 13.1. I'm very slow these days but I will post the results after switching them. Despite my increasing dementia the current RPMs and speed are easy to remember: 7000 revs @ 70mph, 6000 @ 60, 3000 @ 30, etc.

[Stig / Major Tom]

6 yrs ago I was told that sliders "act lighter", so the advice was to go 1 or 2 gm heavier.
But....not knowing this....
I weighed my stock rollers at the Post Office, ordered the 1gm lighter and did not at all like the higher revs at my 35mph cruising. Tossed those Dr P's and went 1gm heavier than stock....and have enjoyed them for 5.5 yrs since.
Stig

[de dee]

Eu moro no Brasil e n tenho facilidade em adquirir peças para essa modificação

Comprei rolos de 15G e atingi 168 KMH de velocidade final m as gostaria de ter a RPM reduzida para economia de combustível mas com velocidade final maior ..

Como você na sua scooter e onde comprou as peças ?



I live in Brazil and I can not easily buy parts for this modification

I bought 15G rolls and reached 168 KMH of final speed but I would like to have the RPM reduced for fuel economy but with higher final speed ..

Like you on your scooter and where did you buy the parts?

  I did not buy any parts , I modified the viator to my liking , ending up the same as malossi variator,   but as you lower the RPM.  your top speed will lower too,  because you will not be in the RPM. for top power,. 

[stuo]

I did it: I replaced the stock 15.4 gram rollers with 13 gram rollers. The difference in acceleration is incredible: no more flat spot off the line! And I don't seem to have lost anything on the top end, 6000 RPM at 60mph, 7000 at 70 and 7500 at 80, with plenty more oomph available if needed. I also sanded the clutch pads with 220 grit and got rid of the "grabbies".  I'm in love with my new scoot!

[moparkid]

Well I wasnt aware of the roller weights, I just ordered what was specified and received 14g weights. Once I had changed them out and weighed the old ones I discovered the old ones were 15.5. So my question is this: will I hurt my scooter drive train using these 14g's until I get the proper 15.5's or do I need to remove them and put the old ones back in until my new ones arrive. After 41000 miles the original rollers had flat spots so I figured while changing out the belt I'd update my rollers. Is there any danger to my bike as I usually ride at  a 65 mph clip most of the time. Yes I've read many posts about the rollers but I am still confused as to whether or not there is a danger to the bike.