kymco mxu270 jetting

[mikehallbackhoe]

I just purchased a new kymco 270, and I absolutely love it. I was reading about the break in procedure, and thought it was overly cautious, but then I got to thinking and the reason they are so cautious is the carburetor is too lean because of emissions. I am in california and our smog laws are the worst. first thing I did was remove the cap that prevents you from adjusting the idle mixture, and that made starting much easier, I don't even need the choke. then I changed the 108 main jet to a 115 and it really runs a lot better. the carburetor is easy to work on, you don't even have to take it off, it can be twisted enough to reach everything pretty easily. the idle mixture screw is not slotted, but I was able to adjust it with a pair of tweezers. the dealer made the changes to the transmission  for me, so all I had to do was screw out the throttle limiter, and this quad runs great. I have tendonitis and the thumb throttle bothered my wrist, so I put a twist throttle on it.  other than that, I plan on keeping it stock, it does everything I could want.

[teamferrari]

Where did you buy the Keihin 115 jet? Is the idle adjustment screw that is not slotted on the bottom of the carb?

[Gwbarm]

Thats interesting Kei Hins are generally tuned perfectly from the factory, maybe because of the snog requirments  they put on these days make them a little leaner, my only concern might be how does it run at high speed and warmed up. Sounds like you have it figured out, but 115 is a fairly large jet for a 270, but if it works good thats all that matters. Thanks for sharing your reasearch.  

[LunaG2]

What would the top speed be? Im completely stock on my 270 at about 38mph