random hole in exhaust pipe, adjustable CDI's, coil plugs and more.....

[carfreak83]

hi everyone. first post.

just bought my people a couple weeks ago and i love it.

I was wondering though if anyone could tell me what the random hole that is plugged by an 8mm (i think) bolt on the exhaust is? Theoretically removing that bolt would be kind of like a performance exhaust right?

second, i know that the US models had unlimited CDI's, but does anyone have any of the adjustable CDI's i have seen for sale? the ones that are supposedly adjustable from 12 to 20 degrees? (stock is 8?) i am wondering if these work or if they are bologna.

third, anyone try a "bando" ignition coil on their scooter? put one on my little brothers 50cc honda and the top speed raised over 10mph and the torque is much better. wondering if we have a high enough quality ignition coil as it is or if my scooter would benefit from a bando coil as well.

my scooter seems to backfire a lot, anyone else have that happen? very quiet inside the muffler, but i can definitely hear it.

thanks in advanced, if you have any info please chime in

[zombie]

Hi CFreak, Welcome aboard,

The bolt in the muffler is there for emissions testing. If you remove it you simply have an exhaust leak that does nothing for performance. If you want a louder tone you can drill a series of 3/8" holes (6 or so) in a circle around the outlet. Combine that w/ some mild up jetting, and you can get a couple more MPH.

HPI (hores power ignition) in Belgium makes a fully programmable ignition system for Kymcos. I have one on a 50cc, and it is one of the best modifications I have done. (I have done EVERYTHING to my bike).
Depending on what modifications you do a few minutes on a computer with the CDI, and you can set ANY Ign. curve you want./

Their set also comes w/ a 40,000 volt coil so there are no worries.

The aftermarket coils as seen on Ebay Ect. are usually pretty good. They do improve plug life but not really MPH.

Your backfire issue can be addressed by adjusting the idle MIX screw. If that does not eliminate it you may need some re jetting of the main. Usually 1-2 sizes larger will fix the popping, and improve top end speed a bit. Re jetting is something you will want to do if you open the exhaust anyway.