I bought a new YY250T 3 month's ago. Last week it started acting up by stalling when I stopped. When I got it started, I had to "pump the throttle" to get enough revs to sputter the 6 blocks home. After a holiday weekend out of town, I couldn't get it to start. I checked fuses, spark at the plug, fuel filter and fuel pump. All seem to be working fine. I removed the gas (I use 92 octane) and replaced it with fresh. I sprayed carb cleaner and got it to run for about 5 minutes, had to "pump the throttle" to get it to rev higher than idle (about 1800 rpm's) then it stalled. Won't start again. Any ideas where I should go next?
I'm voting for a bad fuel pump or vacuum line somewhere. Blipping the throttle raises and lowers vacuum which is how these pumps work. Check for a loose vacuum hose, crimped or cracked. Then try making a gravity fed fuel system with a bottle or hose to connect to the carb. If it keeps running, it's probably the pump.
1991 Honda Nighthawk 250-16,000 miles 1983 Kawasaki Spectre 750-43,125 miles 2009 CF Moto Fashion- 17,235 miles www.twowheeler.yolasite.com/
Thanks to all for the responses! As I'm new to this site, I'm pretty impressed with all the help...
bobf: The scoot has the 244 engine, supposedly a Helix clone. And, of course, the scooter is a Reflex clone. I have service manual for both the Helix and Reflex. No help with troubleshooting my problem.
That's exactly how I set the idle. Learned that from a motorcycle-owning brother.
kz1000st: I did check the fuel pump by disconnecting and cranking the engine. I'd get a intermittent spurt about 2 to 3 inches which is what I expected. Wouldn't that rule out the fuel pump? Is there a spec that I can measure with a vacuum gauge (like the old cars)?
I've also heard that it could be the carb - bad float or something. Don't know much about carbs - does that make sense?
I also found out after I bought the scoot that it isn't really new - it's a 2011 model - meaning that it probably sat in a warehouse for a couple of years. Could this cause problems that need attention?