So...
I know I could save the $ for a bigger bike,
There is absolutely NO info or any reviews (that I can translate) on this so sorry for having nothing more for info other than this photo,
I only know that the stock bike is a 125cc that was bored out for NA markets,
I know I'd have to rejet the carbs (no experience, but willing to go for it),
I know that insurance don't likey the upgrades.
So here's things I know that I don't know (+ things that I don't know that I don't know but I can't list them cuz I don't know them...now I'm just confusing myself .. sorry)
Questions..
1. How high of a chance that the piston will explode out of this "inexpensive" upgrade and smash my danglies into bits?
2. In your opinion, do you suppose I'd get some reasonable power out of it? Highway riding is what I'm thinking... just a few more hps would be nice to not stay in the slow lane ALL the time.
3. Scale of 1-10, 10 being jetfighter tech, 1 being "make a coffee with coffee beans and a mallet", how hard of a project is this?
4. Likelyhood of needing an aftermarket exhaust? Reading another post about a cbr125 seems that stock is ok...
5. How high of a chance this "inexpensive" upgrade goes boom and I need to stop drop and roll?
6. I guess any advice is welcome...other than "buy a new bike". I get it, I should get a new bike. But this is a fun bike too.
Thanks in advance if you have any advice. Also thanks if you make good comments. Like "that's what she/he said". It's always a winner these days.
1. Depends entirely on the quality of the parts (complete unknown) and the knowledge and care of whoever puts it together (probably you - but it's a single cylinder air cooled engine, pretty simple, just don't do anything stupid like mix up the piston rings or install them upside down or get the cam timing wrong).
2. It should help a little.
3. What's your level of experience with engines? Can you read and follow instructions in the shop manual? Do you know to recognize something going wrong and STOP rather than forging ahead and breaking something? As engines go, yours is pretty close to as simple as they get. Trickiest bit for people who haven't worked on engines before is compressing the piston rings - it's not hard but you have to be CAREFUL. And you have to not do stupid things. Piston installed backwards is another good thing to not do. Still, systematic approach, check everything as you go, check check check and check again, and it's not that hard.
IIRC this is a carb engine. The carb will kinda-sorta respond to more airflow through it by drawing more fuel through the same jet. As a first guess and in the absence of any real-world experience, put in a main jet a couple sizes bigger and see what happens. Get it checked on a dyno with exhaust-gas analysis pronto, though. On that hard-working air-cooled engine, you do not want a lean condition under heavy load, but too rich is no good, either.
edit: On poking around, it appears that Kymco uses Keihin CVK carbs, which plenty of Honda and Kawasaki bikes also used before switching to fuel-injection. Haven't found what that specific bike uses but other similar models seem to use those. You can get Keihin carb parts anywhere. Maybe ask the vendor if he has any jetting suggestions. Jets are a few bucks each, here.
I'd be on side with that upgrade, who cares if its totally made in Taiwan, its a bolt on part for a Kymco.
On the Web Page for the parts they state ," increase size of main jet" .
This is a pretty simple fix. Count the number of full turns when you unscrew the old main jet and thread new one in same number of turns, this will get you close as a start point.
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