2012-01-31

CVT Roller weight and you

Modification of roller weights can have a huge impact

But not every modification works for every person and situation.

Let´s take for example a 500cc bike what has around 220 kg (500 pound) weight ready to roll. Now add a single young rider with 60 kg (140 pound) and a mostly flat and high speed capable terrain. Compare that with 2 older riders and some add on´s with 160 kg (350 pound) who ride into the mountains a lot where are extreme steep hairpin turns which require a lot of torque at 20 km/h (12 mph).
While in the first case the original roller setup might work quite well and only a 10 to 15% reduction in roller weight will make a huge impact in the second case you need a setup what is capable in bringing up the rpm from near stand still. Because with the original setup the clutch will squeal at every hairpin turn and the belt will flap itself silly and to an early end, see belt section from how long do parts last

Here is a example from a Honda Big Ruckus and an owner who was even more into weight testing than me.
Effects of  Changing Roller Weights  on a Honda PS-250

Keep in mind that in case of the Piaggio MASTER engine a  5000 km test  was done with the 172 gram 8 roller setup and also a   5000 km test was done with the 86 gram 4 roller setup with very interesting results.

It is also important to know that there is a big difference in 86 gram in 4 rollers and 86 gram in 8 rollers. While the first works absolutely brilliant ( Colt Conversion ) the second one  Woody and Steel  was a total bust.
 I just saw that Dr.Pulley is offering now  13 gram  sliders for the MASTER 400/500cc engines. This would make 104 gram total. Sure could be interesting to test how that works out.

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