Derestricted CDI, restricted boss on Kymco 50cc - Risky?

[tseg]

I identified how to derestrict my 2015 Kymco CDI (Super 8/Agility)... I understand I can get ~ 5 mph more by doing so.  All I want to do is get from 30 mph to 35 mph as the fastest streets in my town are 35 mph, so this sounds ideal.  I've seen one reference that if the CDI is derestriced but the boss remains restricted this can cause damage long term.

Can anyone verify?  Even better, confirm because they actually saw it happen?  If so, can you explain the cause of the distress? 

[gsx600racer]

First, you need to know what restrictions your scooter has.

Most scooters use several forms of restrictions. Lean carb jetting, CDI, varaitor, and exhaust. Reading what the interwebs and what everyone says may not be true to what you have. You will need to do some of your own investigating.

Carb jetting: the main jet could be on the lean side and holding back higher rpms. If this the case up jetting(larger jet) is required.

Exhaust: They are know to have restriction of some form in them. Some will have a washer welded in the inlet or buried a tad in the inlet of the pipe. They could be a catalyst exhaust and have a bit of restriction built into them. The fix would be a aftermarket exhaust.

CDI: These can be tricky. Some you can cut or remove a wire, some you connect two of the wires together. Others are electronically done inside the module and there is nothing you can do other than replacing with a non restricted CDI. If you get a un-restricted CDI I would also consider getting a tachometer seeing there is nothing holding the rpm's back. Over revving an engine just because it might sound cool or faster will eventually leave you with a blown engine. 

Variator: These can be restricted by design. Others will have a "ring" on the drive boss that limits the travel of the variator. Some will have a shoulder on the drive boss that will also limit the travel of the variator. A few will have a restricted ramp plate that will need to be swapped out.

This link would be suggested for more info.
49ccscoot.proboards.com/thread/3903/brand-model-specific-restriction-info

Also don't confuse the 2T(2 stroke) versions of the Kymco Super 8 mods with the 4T(4 stroke) version because chances are they are different.

[tseg]

I have confirmed pulling either of the 2 purple wires will deristrict this Super 8/Agility CDI. I just did it and have indeed got ~ 5 mph more to get me towards 35 mph. Success!

With the above said, back to my original question, will having a derestricted CDI but no other derestrictions cause long term damage? The other 2 primary restrictions on this scooter is a restricted variator boss and a #75 main jet where #82 is ideal. I assume with a derestricted CDI and nothing else the bike will run hotter if run maxed out for long stretches. In my town, the way the roads are, I cannot see the engine being maxed out for durations any more than 3-5 minutes at a time. I also imagine with the CDI derestricted the belt will probably be pressing against the restricted boss ring/lip/shoulder when maxed, which probably didn't happen with the CDI restriction. Could this be concerning?

[tseg]

After I pulled the CDI purple wire I got nervous I probably did a bad thing... after all, increased revs are probably not good for an engine. I've been doing a lot of forum searching to try to get answers and I think here are some conclusions I've come to:

• With a derestricted CDI (now mine is) I don't want to max my throttle while the bike is on the center stand
  
• 50cc scooters that have been reported on forums as having blown up while riding tend to have been pushing the limit (over 55 mph) driving down steep hills
• As long as the scooter wheels are on the ground and one is not maxing out out down hill the engine probably cannot generate the revs to damage the engine... may ultimately shorten life (20K miles vs. 30K miles?)

• Probably does not hurt to put a good synthetic engine oil in the scooter that can better handle high temperatures

Considering I live in a town without hills and no roads long enough to max the scooter more than 3-5 minutes and the CDI only restriction maxes ~ 35 mph I'm comfortable my scooter will last many years.

In summary, with a derestricted CDI, the user can blow up the engine if they intentionally try, but used under normal wear and tear the impact to long term engine durability is likely limited. Anyone have different thought here?

I suppose installing a smooth variator boss and #82 jet will increase max speed potential... and if scooter is kept to 35 mph, that is one way of ensuring engine is not overly strained.  Maybe I should go down this path as added insurance?

[one1]

I have two kymco's as you'll see if you look down two threads or so. One is derestricted and the other is stock. The stock does 35 mph gps verified with just the cdi wire unplugged and the modded does 44 mph gps verified with sliders, boss, and cdi . The one with everything never gets to the redline so the cdi never comes into play. Best mod you can do is a boss, but i highly recommended adding sliders or heavier rollers if you do because the scoot will cruise at low rpm and never redline unless youre trying to.

[tseg]

May 13, 2017 15:37:41 GMT -5 one1 said:

I have two kymco's as you'll see if you look down two threads or so. One is derestricted and the other is stock. The stock does 35 mph gps verified with just the cdi wire unplugged and the modded does 44 mph gps verified with sliders, boss, and cdi . 

This is helpful.  Do you ride your stock scooter all the time with the CDI unrestricted, or did you just test it?  If you leave it unrestriced, how many miles have you put on it like that?  Any adverse effects to date?  How many minutes would you typically run it WOFT?  I'd like to think I don't have to worry about what I just did, but I still have doubt that I may have just done a very bad thing.

I'd rather not go down the the smooth boss / #82 jet path if I don't have to. 

[bloominator]

Honestly, changing the boss is the safest and least invasive thing to do... It essentially just changes the gearing to help you go faster while the motor is at the same RPM... I would change the boss before messing with the CDI or the carb/exhaust...

[brian74]

Hi I am new here. I have a 16 Kymco Super 8 4t 50cc. Kymco is a very durable scooter, 1 of my brothers has had 3.
1 Agilitys 50cc and 2 125cc Agilitys. They have all at least 30k miles. Kymco restricts the carb, CDI, the width of the variator, probibly the rear gear is to small also, the exhaust is restricted. I'm getting ready to put a PWK Flat Side 24mm
carb on It should be great and better after I put the cdi from a Kymco 125 on it.

[brian74]

And the purple wire on the Kymco dc/cdi 8 pin is just a jumper. cutting it doesn't do anything'