kickback or bucking at low speed

[PepsiMaxKid]

Hi all,

I have a 2009 People 150 (Espresso for us Aussies) that kicks back when accelerating. When I get to about 20kph/15mph I get a good buck then it smooths out, but every low speed corner or take off from a full stop I get the kick back.

I am a newbie to the scooter world, but think I am pretty smooth on the throttle and I didn't have this issue at all when doing the my motorcycle license course on their scoots (Super 8 125's)  Not sure what I should be looking for so any suggestions would be great.

Thanks

:-)

[CROSSBOLT]

Carb or fuel injected? I am not familiar with the People 150.

Karl

[PepsiMaxKid]

Pretty sure its a carb

[CROSSBOLT]

Hey, G'day! None of us would know anything about Australia if it weren't for Crocodile Dundee! I met some RAN sailors in Okinawa that were a riot!

Checked Kymco non-current models and it does not boast of EFI so it's a carb. Otta be like a Rolls-Royce at all speeds but you know that. This may be hard to isolate. I would start with where is the needle in the main jet. For example, what groove is used by the snap ring or whatever device used for securing needle height. May be set too lean or too far down (snap ring in top groove). This all assumes the float is in the the proper position and the float bowl is clean, all jets clean, fuel is clean and flow to carb is sufficient.

Karl

[TLRam1]

I am guessing dirty carb / pilot jet.

[CROSSBOLT]

I agree with Ram. When you hear hoof beats, look for horses not zebras.

Karl

[Stig / Major Tom]

I agree with Ram. When you hear hoof beats, look for horses not zebras.

Karl

Dang Karl, you're the only scooter rider I know who quotes Groucho Marx, or is it Nietzsche!
Stig

[CROSSBOLT]

Really old f@rts do that a lot!

Karl

[PepsiMaxKid]

Thanks for the help. 
I know what I am doing this weekend. Now off to find the service manual so I can even find the carby..... Ahh who am I kidding, I'm a geek and calling my Dad to help me!!

Dear old Dad did give my fuel a squirt of fuel stabilizer and wow, she idles way smoother. Still get that low speed buck, but much smaller and not so noticeable now.

BTW good advice from an Aussie, don't drink Foster's, it's British..... And terrible....

[CROSSBOLT]

Guess that means dirty and/or water in fuel. Whatever works!

Karl

[Mr. Paul]

Kymco 125/150 service manual can be found here;

http://www.kymcospareparts.com/images/stories/service_manual/people125-150-service-manual.pdf

[JJJoseph]

I am guessing dirty carb / pilot jet.

It's unlikely to be dirt, although it_IS_ running lean.  New scooters have excellent micro fuel filters so your carb should always be squeaky clean even without any maintenance. I'd go with adjusting the carb needle UP one notch, or go to a one size larger (+.025mm) pilot jet, i.e. go from 40 jet to 42 jet (or whatever your pilot jet is).  Or both. (A #40 jet is .40mm)

Kymcos are annoying this way.  They're sent from the factory with really lean jets & needles because of global warming, and the slightest change in temperature or altitude gets them stumbling like that.  The restricted 50cc models are bloody awful in this respect, you're lucky if you can get more than 50kph out of them, even downhill.