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Thanks for the replies. the first thing i did was check the carb for water that got in through air intake but it was fine. ive found ou it was the piston as the rings had become pretty mangled and were getting blow back and so the compression was awful. I put a brand new piston in it and the compression was much better but it still wont start :/

Hi. more problems with scooter I am afraid. About a month ago It rained for the first time in quite a few weeks, really badly. I drove home from college in this weather and had no visible problems while driving. I got home and as I eased off the throttle the bike dident hold the idle and died straight away. I put the bike out of the rain and rushed inside as I had to go to the gym in a few mins. I came out to go and the rain had eased of considerably. I tried to start the bike and it started with great difficulty. took a few minutes of continuous cranking. Once I got it going I figured the ride to the gym would sort it out as it had basically stopped raining. On the ride there the bike seemed slightly slower than usual maybe 1 or 2 mph. might of been my imagination though :/ I got it to the gym and went inside. 2 hours later I came out and nothing would get the bike going. I spent a good 20-30 mins trying to get it going with a friend and it wouldn't go. I used WD40 as well. I got it home and it has been sat in my shed for about a month so I doubt there is still water in it. I have checked: spark, fuel, piston (piston dosent seem dirty or damaged although I dident get a look at the rings), and lots of other things as well. I also checked the compression but I dont have a gauge for it so I only have my finger to go on. It pushes my finger of a little every time I crank, so I assume its good. After checking all these things I hooked the bike up to the car and tried to start it as my battery had died and after maybe 30 mins of continuous attempting to start and altering carb screws and spark plug etc I finally got it going once but it wouldn't idle and it sounded awful. I quickly turned it off and have not been able to get it going again. I am not sure atm whether the rain has caused the problem or if it is just a coincidence as I am sure I would have been able to diagnose a rain related issue I am at my wits end. can you help?
-Aaron

Ive gone back over it and double checked the valve clearances, all fuel lines, compression and spark. none of these are problem, it is just really bugging me that it run like 3 hours ago fine but now its as dead as it was 2 days ago and I see absaloutly no signs of life no matter how many times I kick it. :/

Nahh it dosent have a kill switch

I noticed during my valve adjustment that the bottom one (that i assume is the exhaust valve) has lots of black deposits on it, might be oil or carbon not too sure. caould this valve be burned out or would a burned valve not allow the bike to start?

Hi, i hope you can help me with my scooter.
I have an agility rs 50 which I have had for 7 months or so.  Since i got it, it has had a new top end put in because of lack of oil and seizing.
Recently though I was driving to college and about 2 minutes from my house I pulled over to let a car past and it dident idle. It does this frequently and usually just restarts fine so i tried that and it dident restart. I tried several times to get it going, failed, and so pushed it home. I checked the oil and it was low but not too low to cause problems as far as I know. I had a friend come round and we looked over it and did a few things: Check crank sensor, Check fuel lines, and cleaned the carburetor + jets   and a few other things I cant remember of the top of my head.  We then thought it could be the piston so we stripped the bike down and replaced the piston which had become really sooty. After doing this and putting it back together the bike still wouldent start. I left it overnight and the next morning I managed to get it running albeit poorly and with lots of kicks. It makes a very bad rattling noise and kind of sounds a bit like a 2t. It also will not idle for more than 5/6 seconds, And will only stay running if I jiggle the accelerator a bit from 1/4 to 1/2 open.  I then read that the difficulty of starting and not idling could be valve clearances so I fixed that to 0.004". This did little to help.  My friend seems to think the rattling noise could be the exhaust gasket or something similar.   Can you please help me fix this as I very much need the bike up and running soon. Thanks