How to derestrict 50cc Kymco Cento 4-stroke?

[JJJoseph]

There was some earlier discussion started on derestricting 50cc 4T Kymcos, but the how-to photos were posted outside this forum and have disappeared.  What was left of the 4-page discussion was hijacked by 2-stroke speed demons, so in the end there's nothing left of the original discussion.  The stock variator on my machine isn't restricted, but I'm otherwise stuck in some kind of low-rpm mode that limits speed to 45km/hr (about 28mph).  Has anybody done this recently?

[wheelsoffreedom76]

http://www.scootertherapy.com/bosspage.html
http://www.scootertherapy.com/cdiboxcutpage.html

   Is the 28 mph what the speedometer is indicating, or a true 28 mph? Looking around the net it appears people are getting around 37 mph on speedometer with them unrestricted. You may want to pull the carb and see what jet it has as well, the agility 50s get bumped up to a #82 when derestricting.

[JJJoseph]

   Is the 28 mph what the speedometer is indicating, or a true 28 mph? Looking around the net it appears people are getting around 37 mph . . .

Exactly - that's why I'm asking.  There was a useful thread at one time, but it's totally fallen thru the cracks, so I have to ask the question again, hoping that someone will still be working on how to de-restrict 50cc 4-strokes.  I understand that jets may need changing, but more info is needed.  Just changing a jet by itself won't do anything.  For example, de-restricted CDI units are available on eBay for 139QMB engines, but they don't work on a Kymco 139QMB for some reason.  Does anyone know why?

[wheelsoffreedom76]

Kymco typically uses DC powered CDI units, while more rare there is unrestricted units available for it.
http://www.monsterscooterparts.com/no-rev-dc-cdi-kymco-agility-50.html for example

  The hack saw mod generally works on the 4T models. While having no limit on the engine rpm may gain you a few mph, it is not where you will gain the most speed. The cvt must be fully unrestricted. Mark the pulleys with a sharpie and do a top speed run and see where the belt is traveling. Some models have a restricted rear pulley, and some have a belt that is too short preventing the cvt from reaching it's highest ratio. The main jet should also be changed so the engine isn't trying to pull the higher rpm and cvt ratio in a lean state.

[JJJoseph]

Kymco typically uses DC powered CDI units, while more rare there is unrestricted units available for it.
http://www.monsterscooterparts.com/no-rev-dc-cdi-kymco-agility-50.html

Thanks!  The hacksaw method gained a measley 3mph, but the Hi-perf DC-CDI you suggested really did the job!  I'm almost at 40mph now.