KymcoForum.com
Scooters - 50cc => Agility 50 => Topic started by: browney14 on February 11, 2012, 05:30:56 PM
-
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
-
valve clearances so I fixed that to 0.004
...valve clearance is .04mm....not 4 thousandths...so fix that back..
..your idle and starting issue may be nothing more than incorrect idle mixture..
..a good starting point is 2.5 turns counter-clockwise from fully closed on your idle mix screw..
peace
..btw, welcome to th forum!..
-
Thx for reply. I meant 0.004 inches. I have reajusted the mixture screw to what you suggested and it is alot easier to start and idles perfectly, the only problem I have is that it is still making the rattling noise, well.. its kind of a rattling noise, the bike is alot louder. I could say it sounds like its chugging? hard to describe. Im not sure wether i properly seated the exhaust over the hole in the bottom of the engine, would even leaving a bit of a gap cause these noises? Oh and if i leavie it running for mpre that 2 or 3 mins the exhaust hole at the bottom where it meats the exhaust starts smoking as it become very hot.
-
if there is an exhaust leak at the flange it will cause overheating /burnt valves and poor performance due to a lower vacuum at the carb. The smoking may be the plastic from the shroud getting heated from a leak. You need to find a suitable exhaust gasket. Hardware, and small engine shops will have one you can use vs. the OEM gasket. About 2 bucks. Bring the pipe w/ you to match one up
-
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?
-
If you can see deposits on the stem it is possible the seat, and seal are bad. Take a compression test on the scoot. It should read over 120psi
-
Thx for reply. I meant 0.004 inches
.004 inches is equal to .1016 millimeters, and is WAY TOO BIG of a valve clearance gap...
..with that gap, your valves are barely opening at all!!!
.. .04mm is equal to .001574 inches.....
-
I managed to get the ped running by following all your advice and I took it for a 10 minute drive were it went smoother than it ever has before but when I got it home I turned it off for a few minutes and now it wont start again :/ really driving me mad now.
-
You didn't leave the kill switch on did you ? Good luck .
-
Nahh it dosent have a kill switch
-
I managed to get the ped running by following all your advice and I took it for a 10 minute drive were it went smoother than it ever has before but when I got it home I turned it off for a few minutes and now it wont start again :/ really driving me mad now.
starter relay switch might be going bad.
-
..or that the top end has heated up and now ur valves aint opening at all...
....im just sayin.... .04mm and .004in is a big difference...
-
Nahh it dosent have a kill switch
Im sorry I have to go there.......lol OK off and on switch.
-
Haha yer its turned on fully ;P
-
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. :/
-
just went over my scoot today also my carb had a air leak some wear so ounce I got it running I took carb cleaner to the outside of the carb ounce it hit the area by the elc. choke the scoot stalled out so that told me air leak. took the carb apart and found the o-ring was bad around the elc.choke sometimes the littlest things matters. its running ok now . give it a try if you can get you scoot to start take carb cleaner to the carb while it is running .
-
You say you DO have spark? The only other things are fuel/compression. Kick it again to check for spark. I have had several bad wiring harnesses that work one minute, and dead the next. Always the same thing No Spark. Check also if your Cam gear is movable. The timing chain tensioner is a TINY spring that may be broken/soft.
-
mmmm check the fuel pedcock its the thing your gas line is hooked to so it lets fuel out of tank.you may not be geting enough gas to keep it running long .sounds like its running just for a while then when the carb is empty it stops. does that sound right.to check this losen your gas cap to let air in the tank and see if it well turn over.
-
I have had several bad wiring harnesses that work one minute, and dead the next.
..check the spring clip inside the spark plug boot..
..my buds zx clip came out...causing some of these same issues...
-
Thanks for all your help guys, think ive sorted it. I went out this morning and it started perfectly, went for a 30 minute drive and it was great, I think the crank sensor got wet last night and that was why it wouldent start.
-
good to here that.have fun with your scoot.
-
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
-
I just put oil in the spark plug port and cranked it without and then with the spark plug. with the spark plug in the bike fired up for maybe a second. so im assuming its compression. does this mean its definetly the piston rings?
-
..ive been riding in the rain...so hard i had a trooper following me for protection before..for nearly 5 years...no problems....
...doubt the rain caused the detrimental non=starting issue...
..check/clean.. your air filter, run your idle mix screw all the way clockwise(seating lightly)..
..then open it counter-clockwise 2.5 turns...
..put inna new plug, then try to start it...
-
Dude!!! The carb bowl was full of water from the intake when it stalled at idle. You've had water/Eth. gas sitting for a month in the bowl. Disassemble the carb, and clean it. There's posts on wire cleaners, and such. Get a New air filter/in line fuel filter/spark plug/stuff to clean carb for under 100.00, and it will be good for a long time.
Or "hit it with a mallet".
-
You've had water/Eth. gas
..just hadda go there...lmao...
..however, you may be right!!!...
;)
-
The Eth. stuff turns into a jelly like crap. Like the stuff in baby diapers. That "jelly" is Mostly water, and diluted acids from the decomposing Eth, and fuel. It turns brass jets / atomizers into Brillo...
Carb Clean, and picks.
-
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 :/
-
Only two left Spark, and fuel. Will it spark? Try starting fluid, and see if it fires. That will leave only fuel.
-
..and ur plug looks like this...lol...
..well, 2t plugs do...
;D