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Hmm so after your comments seemed reasonable, I looked up wheel weights and I think those were supposed to be there.  Somehow I missed them even though I've cleaned the tires 10+ times.  Perhaps my mind is growing foggy in its old age?  Now I'll have to retrieve them from the trash or order new ones.  Stupid hurts!

So apparently the problem is not completely solved.  I think turning up the idle screw kinda masked it, but didn't solve the underlying problem, because today it felt like it almost stalled as I was pulling down the block from my house.  Any ideas?  Should I clean the carb?

So I turned the idle screw about 180 degrees.  It's running like a charm.  I didn't predict how easy it would be since I've never worked on a carburetor before.  Also, I hadn't yet noticed the easy access panel, and was thinking I would need to take out the whole "met-in" (what does that mean?) bucket.  I guess they make our carbs easily accessible, since we're always working on them huh?

Thanks for the help people, I hope this is the last we've heard of this problem...

So my P S 250 has about 5,000 miles on it, and I've just run into my first problem.  I've noticed for a while that when the bike is warming up, it seems like it has been revving a little low.  Two weeks ago, it actually stalled while it was warming up, after running for about 8 seconds.  In the past week, the problem has gotten worse, and it now sounds like it's going to stall for about a minute when you start it after it's been cold, unless you give it a little gas.  Two nights ago, the bike was cold and I had just pulled away down the block and came to a stop sign; when I stopped at the stop sign I actually stalled.

So, I think it's idling too low and I was planning on adjusting the idle screw on the carburetor a little bit.  This is the first time I've worked on my bike besides basic maintenance, so I wanted to see what you guys thought first.

I don't know if this is related to my first problem, but there's one other strange thing I've always noticed with my bike.  When I ride it for a while, and I stop to go into the store or have a meal or something, and it cools down a bit, and then I go back out and start it up again, the rear wheel sometimes spins when it's still on the center stand and I haven't given it any gas.  Sometimes, it gets going quite fast, and I have to put on the rear brake before I take it off the center stand.  If I let it sit on the center stand long enough, and the let the choke go down, it stops.  I never worried about this too much before.  Should I?  Anyone else experience this?  Thanks!!!

The manual says to change the fuel filter screen at 7,000 km, but it doesn't give any information about what the fuel filter screen is or how to change it.  Does anyone know where I can find the part (in USA)?  How do you change it??

Also, is it really necessary to change the air cleaner every 4,000 km?

Thanks!

I distinguish highway riding from street riding.  On the highway you don't hear anything anyways, and there's a relatively small number of variables to pay attention to.  To keep my mind active during long stretches on the highway, I enjoy listening to music.  Also, the right type of headphones can help block out ambient wind noise.  If I'm on the highway and not listening to music, then I use earplugs.
Street riding requires more attention (there's more variables to track), is entertaining enough on its own, and you actually can hear things going on around you, so I don't listen to music.  I waver on whether or not to use plugs on surface roads.

Sorry man, it was a liquidation sale and the dealer no longer exists.  That's why the price was so low.