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I'm looking into getting a new battery for my 50cc scooter, too. I came across a seller on ebay selling 12V 4Ah batteries for $25.80 with free shipping. It has the separate acid packs.

Here's a link to the seller's ebay store if you want to check it out:
stores.ebay.com/United-Express-Parts

I looked at it today. The air box is crack free and so is the hose that runs to the carburetor. Last week I was getting it cleaned up (it was very dirty from winter riding) and wiped most of it off. Not much is visible at this time, but I took this picture anyways.

You can see some yellowish color near the area that's being overlapped by the green wire.

I'm sure it's recording in miles. I once looked up a destination on Google maps. It said the distance was exactly 10 miles from my house. When I drove there on my scooter, the odometer had gone up 10 miles.

Just so you all know, this is like a little game/hobby to me. I do enjoy the rides and have fun. It's just interesting and amusing to see how cheap I can be with my scooter.

I do this same stuff with my car. I have a 1996 Ford Escort LX (2 door hatchback). EPA MPG: 22 City, 25 Combined, 29 Highway. I once got 37mpg and that was with combined traveling.

Yes, completely subsidizing my fuel cost with the value of the cans I collect would be awesome.

I have a 2010 50cc Roketa Bahama. Like with my car, I drive it easy to help maximize gas mileage.

During the middle of summer last year I bought 3.281 gallons of gas for $12.27. I started using that gas when my tank was 1/4 full. At that time, I had 1,736.6 miles on my scooter.

After all that gas was used up and my tank was 1/4 full, I had 2,134.6 miles on my scooter.

Miles after minus miles before for total miles traveled on the gas:
2,134.6 - 1,736.6 = 398.0 Miles

Miles traveled divided by the number of gallons of gas used for miles per gallon:
398.0 / 3.281 = 121.3 Miles per gallon

Price of gas divided by number of gallons for price per gallon of gas:
$12.27 / 3.281 = $3.74 Per gallon

Price per gallon divided by miles per gallon for cost of each mile traveled on my scooter:
$3.74 / 121.3 = about $0.03 Per mile

In my state, beer and soda cans can be redeemed for 5 cents a piece. Every time I went to my friend's house on my scooter, I took any cans I could find. I collected 29 cans while I was using that 3.281 gallons of gas.

Cans times the 5 cents each is worth for total amount earned:
29 x $0.05 = $1.45 Earned

Price I paid for that gas minus the amount earned from collecting cans on my scooter while using the gas:
$12.27 - $1.45 = $10.82

So I basically went 400 miles on $10.82. Scooters are awesome!

Note: While I was using this gas, my carburetor's needle valve stopped making a proper seal. It flooded, even soaked my air filter with gas. More gas was also wasted while I was fixing it.

The numbers could have looked even better if it was not for that problem.

Also, in case you're wondering, "Why 3.281 gallons". I wanted to use up more than just one gallon to help average out the millage. And the gas can I used is a metal one with lots of dents in it, so it holds an odd amount.

Like Alleyoop said, it might be running rich or lean.

I had idling issues similar to what you're describing when the needle valve in my carburetor stopped making a proper seal, causing the engine to run too rich.

I had no idea what was wrong, until I checked my air filter and found it soaked in gas and black soot on my spark plug.

I'd check for signs of a flooding carburetor. Maybe you could see if there is a trace of gas in the unit that holds your air filter.

Alright, so .002 seems to be the standard (at least in a manual), but many find that setting to be too tight.

I do think this is a bit odd though. I'd imagine the engineers who designed this engine would've determined the most suitable valve clearance so factories would know what its workers should set (or at least try to set) the valves to.