B&W 150 starting issue

[stepheva]

Good day all,

My first post!  I'd like to say that I just got a Kymco B&W 150 today, used. It has 3100km on it, and I paid $1K cdn.  It has some small cosmetic issues due to being damaged in shipping, but runs very well once warm.  I'm not new to scooters, I have had over 20. But this is my first Kymco. My issue is that when it's cold and I start it, it idles all over the place....high, low, sometimes cuts out entirely.  When it's warm, it runs like buttah, but I'm stumped.  I've checked over the bystarter, and it seems to be opening fully, and retracting.  Anyone else have a similar issue?  Thanks

[zombie]

Sounds like a vacum leak. Try SHORT bursts of NON FLAMABLE brake clean around all of your intake, and carb connections. When you hit the leaking area your idle will drop off, and the by-product is a shiny clean engine. also chk around any/all seals.

[stepheva]

Well, I'm still stumped.  The carb is clean, the a/f screw is open 2 1/8 turns, idles at 1800 when warm.  Doesn't appear to be any leaks anywhere.  Just doesn't start and idle right with the bystarter.  Once it's closed, runs like a champ.  I dunno.  Any more ideas?  Thanks for any and all help to those who reply.

[Shaka]

It sounds like the bystarter may be functioning (opening/closing), but not necessarily when it should, or intermittently.  If you're attached to that feature you might just try a new one, , or just replace it with a manual choke.  You can also check the resistance between the two wires on the bystarter.  It should be less than 5 ohms, cold.