Dr. Pulley Upgrade

Went over to Maju Motor Racing in Shah Alam its located at Jalan Cetak 16/3 (GPS : 3° 3'28.69"N  101°30'25.17"E) to get this Dr. Pulley slider roller for my SYM VTS 200.

I bought the 20x15 15.5g, standard fit for the SYM is 13.5g. I want better top speed RPM and not compromise on the initial acceleration.

Its an increase of about 12g as compared to stock, and for the VTS they have 13.5, 14.5, 15.5 and 16.5g.

It comes together with the Variator plate guide, and need to be replace too.  The material these slider are made off is very slippery and that suppose to increase its performance.

First step in replacement is this drive belt cover need to be removed you will need 8mm, 10mm socket and a philip head screw driver for this job.

One screw a bit obscure from sight but luckily they provide an access hole.

The screw driver for this breather ducting.

Its out and those are the tools needed, the 10mm socket need for air filter box holding bracket.

The screws, only one extra long its beside the Air filter box screw. So its easy to remember where its located.

The front drive (Variator) nut need to be removed its using 19mm socket, for this I need to use the impact drive that I just bought.

Very easy with the impact and its powered by the bike cigarette outlet.

Wrench and Variator half.

Belt part number, its still new only 1100km on clock.

Variator out, leaving only the drive shaft.

Variator

Next step to change the slider and rollers.

This is how the original roller installed below, take note of the roller face they are different. The metalic face is installed away from the pressure wall of the variator. Wrong installation will worn the roller quicker.

Dr. Pulley installation, its difficult to get it wrong. The word Dr. Pulley must be on the Variator pressure side wall.

Roller and Slider Guide in.

There you go all done.

Installation is just the reverse of removal, no big deal.


Test is for a short ride and smoother with the acceleration, will try further and update here.


GPS Screen shot, tested on circuit meter indicated 130 km/hr

Below is the screen shot of max speed once the bike is stand still.

RPM about 7.5k it cannot go any more than this, maybe due to the 15.5g, I like it this way since its ideal for long distance. Take off speed is reasonable and can't fell any compromise.