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Post by thenewzolt on Feb 27, 2012 16:45:08 GMT -5
I just brought the scooter out of the barn today. It started right up and ran fine, but half way through my ride i pulled up to a stop sign and the scooter just shut off. I then try to start it up and i had to open the throttle up full throttle to get it started. Now as soon as I let off the gas the engine turns off. I tried ajdusting the a/f ratio, and i checked to make sure it is getting fuel and it is. I think maybe it needs a carb cleaning hopefully that will fix it. Any help is appreciated!!
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Post by mainepeace on Feb 27, 2012 19:41:39 GMT -5
First, clean the carburetor. Give it a thorough cleaning. Make sure to clean the tiny passageways, especially the idle ones.
Adjust the valves. .004" intake and .005" exhaust. A bit tighter if you prefer.
Those two things solve 90% of the scooter stalling/no-start issues.
Then you may need to readjust the A/F mixture.
Greg
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Post by thenewzolt on Feb 27, 2012 20:18:27 GMT -5
Well i just tried the valves and that didn't solve it. so I guess its time to clean the carbs.
I start the scooter it runs for 3 seconds then dies. hopefully cleaning the carb fixes this.
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Post by terrilee on Feb 27, 2012 20:24:41 GMT -5
it should the a/f screw is a problem alot
but u should also check the lines gas & air
a simple crack into a airline will cause u to go nuts
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Post by mainepeace on Feb 27, 2012 20:25:20 GMT -5
Also check the float valve and needle valve. Next I'd check the petcock.
Well, it's always a good time to check everything. There are dozens of things it possibly *could* be.
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Post by thenewzolt on Feb 28, 2012 9:38:11 GMT -5
well cleaning the carb seemed to fix the problem. thanks for the help guys!
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Post by thenewzolt on Feb 28, 2012 15:26:58 GMT -5
Well I took it for a ride and it started dieing out again. As soon as I come to a stop or slow down the scooter dies. It will not idle at all once it is warmed up.
So far i have: Checked valves Cleaned carb Checked for cracks Checked the petcock- I took off fuel line from carb and cranked it and fuel came flying out pretty strong.
What else should I check???
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Post by orphansoul on Feb 28, 2012 15:59:57 GMT -5
Did you try adjusting the idle speed? Are you adjusting the A/F when the engine is hot?
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Post by imnts2 on Feb 28, 2012 16:43:52 GMT -5
You would not be the first person to check one thing after the other and finally go back and recheck the valves and find they are off again. (May I assme you figured out it is a good idea to leave any plastic off that you have taken off till you are sure it is fixed.) Would not hurt.
And have ou confirmed you have spark?
I sometimes squirt a little gasoline in the intake to try to double check the thing will run. Just pull the vacume line that opens the fuel shut off from the intake manifold and squirt a little remove gas in the intake.
Are your keeping the battery hot with a small battery charger (2Amp)
I suspect you float is not shutting the fuel off coming in to the carburator and you may be flooding it. Pull the plug and see if it is wet. If is is, I would recommend a new carburator.
Stick with it and good luck.
lefty2
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Post by wile on Feb 28, 2012 16:59:51 GMT -5
When you first start it cold does it idle nice and high or just barely stays running? Does your scoot have a tach? If so when it is idleing what rpms is it idleing at. You can try and turn the IDLE SPEED SCREW clockwise a little doesn't take much to raise the idle, it may be idleing to low. Bring up the idle just as long as the Rear wheel wants to turn.
If that does not do it I have to say that the valves are to tight and that causes loss of compression and they will die at low rpms when you come to a stop or coming to a stop. Wile
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Post by thenewzolt on Feb 28, 2012 17:01:46 GMT -5
Did you try adjusting the idle speed? Are you adjusting the A/F when the engine is hot? I adjusted both of them while hot.
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Post by thenewzolt on Feb 28, 2012 17:04:56 GMT -5
You would not be the first person to check one thing after the other and finally go back and recheck the valves and find they are off again. (May I assme you figured out it is a good idea to leave any plastic off that you have taken off till you are sure it is fixed.) Would not hurt. And have ou confirmed you have spark? I sometimes squirt a little gasoline in the intake to try to double check the thing will run. Just pull the vacume line that opens the fuel shut off from the intake manifold and squirt a little remove gas in the intake. Are your keeping the battery hot with a small battery charger (2Amp) I suspect you float is not shutting the fuel off coming in to the carburator and you may be flooding it. Pull the plug and see if it is wet. If is is, I would recommend a new carburator. Stick with it and good luck. lefty2 the scooter does run so I don't think it is spark. It runs fine til it is warm. I come to a stop when the engine is still cold and it stays running fine. But once it is warm it shuts off when I come to a stop and i have to stay on the throttle to keep it running.
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Post by thenewzolt on Feb 28, 2012 17:07:13 GMT -5
When you first start it cold does it idle nice and high or just barely stays running? Does your scoot have a tach? If so when it is idleing what rpms is it idleing at. You can try and turn the IDLE SPEED SCREW clockwise a little doesn't take much to raise the idle, it may be idleing to low. Bring up the idle just as long as the Rear wheel wants to turn. If that does not do it I have to say that the valves are to tight and that causes loss of compression and they will die at low rpms when you come to a stop or coming to a stop. Wile The scooter idles nice and high when it is cold. I checked the valves again and the intake is .04 and exhaust is .05 so im not sure what the problem is.
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Post by orphansoul on Feb 28, 2012 17:11:40 GMT -5
Its either a fuel mixture issue or your electrical system isn't able to keep up at idle. Since it runs fine cold, I don't think its electrical. I'd try putting in a new spark plug if the one you have is older, just as an optimistic shot in the dark. Otherwise, I would take another look at your carb. My bike had this issue at stops until I put a new carb in it....but now that I think of it the new carb came with a new choke...maybe your choke isn't engaging/disengaging all the way? It never really bothered me much, I just gave it a very gentle throttle at stops. It is frustrating though, to say the least.
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Post by thenewzolt on Feb 28, 2012 17:55:49 GMT -5
Its either a fuel mixture issue or your electrical system isn't able to keep up at idle. Since it runs fine cold, I don't think its electrical. I'd try putting in a new spark plug if the one you have is older, just as an optimistic shot in the dark. Otherwise, I would take another look at your carb. My bike had this issue at stops until I put a new carb in it....but now that I think of it the new carb came with a new choke...maybe your choke isn't engaging/disengaging all the way? It never really bothered me much, I just gave it a very gentle throttle at stops. It is frustrating though, to say the least. Spark plug isn't old at all. I wouldn't mind giving it a little throttle at stops but when it dies sometimes it requires full throttle to get started again.
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Post by mainepeace on Feb 28, 2012 19:18:52 GMT -5
Try increasing the idle screw. Set it when warm. Then readjust the A/F screw. See what happens tomorrow when you start it cold.
Greg
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Post by beachbum on Feb 28, 2012 20:08:42 GMT -5
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Post by wile on Feb 28, 2012 20:24:35 GMT -5
It is your valves my friend YOU adjust them when the engine is COLD not hot.
So adjust your valves again WHEN the engine is cold before starting it in the morning of a few hours after you put it away.
TOP Intake to .004 inches and BOTTOM Exhaust to .005 inchs. Those are the numbers on the feeler guage and make sure it is at TDC(Top Dead Center) with the 2 little holes on the Cam Sprocket even with the edge of the head and the big hole straight up. And take your time after you adjust them turn the motor over and re-check them. What I do is try to slid in the .005 inch gaue on the TOP one which is set at .004 and it should not go in. The bottom I take the .006 and do the same thing it should not go in. Wile
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Post by thenewzolt on Mar 7, 2012 15:38:32 GMT -5
Well I brought the scooter back out of the barn. Adjusted the valves before I started it. Went to start it now it wont start. just cranks and cranks...runs for a second, then dies. Now the battery is dead and charging. any ideas?
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Post by thenewzolt on Mar 7, 2012 17:32:11 GMT -5
well i got it to start with starting fluid, but it will not idle. It seems to run fine but as soon as I let off the gas the scooter dies. Really don't know what the problem is..
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Post by Blueboy5000 on Mar 7, 2012 17:34:35 GMT -5
Potentially there are many reasons why this could happen. Though I'm surprised nobody mentioned the enricher. Enrichers usually present a problem when the bike is cold. But occasionally they manifest problems when the bike reaches running temperature, usually causing them to "choke" and stall.
Since you cleaned the carb, did you set the A/F mixture while the bike was warm, and then adjust the idle?
Did you check all your vacuum lines for bad sealing and cracked hoses?
Did you attach a mutilmeter to the running bike and make sure you don't have a charging issue?
There's a whole bunch of different things that could cause stalling, best idea is to investigate all hoses (fuel and vacuum) and all air ducting, and intake manifold for leaks ( i usually use a can of carb cleaner and the red wand/nozzle that comes with can and spray at junctions of lines and at manifold, if your RPM's pick up, then you have a vacuum leak.
Make absolutely sure you have no vacuum leaks before you set your A/F mixture and idle.
That aside, I'd re-check your valve adjustment since you currently aren't running at all.
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Post by thenewzolt on Mar 7, 2012 17:40:30 GMT -5
Potentially there are many reasons why this could happen. Though I'm surprised nobody mentioned the enricher. Enrichers usually present a problem when the bike is cold. But occasionally they manifest problems when the bike reaches running temperature, usually causing them to "choke" and stall. Since you cleaned the carb, did you set the A/F mixture while the bike was warm, and then adjust the idle? Did you check all your vacuum lines for bad sealing and cracked hoses? Did you attach a mutilmeter to the running bike and make sure you don't have a charging issue? There's a whole bunch of different things that could cause stalling, best idea is to investigate all hoses (fuel and vacuum) and all air ducting, and intake manifold for leaks ( i usually use a can of carb cleaner and the red wand/nozzle that comes with can and spray at junctions of lines and at manifold, if your RPM's pick up, then you have a vacuum leak. Make absolutely sure you have no vacuum leaks before you set your A/F mixture and idle. That aside, I'd re-check your valve adjustment since you currently aren't running at all. The bike does run when i spray starting fluid. I wish I could check for leaks, adjust the idle, and a/f but getting the bike to run without giving it throttle is impossible.
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Post by scripting25 on Mar 8, 2012 16:48:46 GMT -5
just for giggles, take the gas cap off and try to start it. my scooter has a vacum issue and it'll stop running at any moment. I have to take the gas cap off and it'll start back up and run fine until it decides to die out again lol
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Post by dyoung1167 on Mar 9, 2012 11:57:19 GMT -5
i also think your enricher isn't extending to shut of the extra fuel after it warms up. also, now that it won't start at all after you adjusted your valves i'm thinking that there is something in your procedure that is incorrect. did you make sure the two small wholes in the cam sprocket were parallel with the edge of the head and the larger whole at the top? along with doing it cold this is very important and if they are even a little out of alignment the gaps will be wrong. also, if you rotated your engine backwards to do this you may have locked open the anti reverse start lever that many of these engines have. it is a lever next to one of the rocker arms (intake or exhaust i'm not sure but i think intake). i'm not sure how to disengage this as i only know they exist. i would think that as long as the engine got turned back in the right direction it would disengage it's self but apparently this isn't always the case. hopefully someone here who knows more about them will chime in.
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Post by thenewzolt on Mar 9, 2012 16:25:31 GMT -5
it starts when i spray starting fluid. but i have to keep on the gas to keep it running. if i let off it dies. I purchased a new enricher hoping that will fix it when it arrives.
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Post by ce on Mar 9, 2012 16:57:26 GMT -5
When you clean the carb, what do you clean?
Did you remove and clean the pilot jet, the main jet and the float valve?
It is most likely a clogged pilot jet, which runs the slow circuit, and the main jet runs the fast circuit, which is with the throttle open.
It could also be the diaphragm is damaged or leaking.
All of these problems would be solved with a new carb for $35 delivered.
Buy a new carb, install it, then take the old one apart to see what the problem is.
You now have a running scooter, and a new carb with a full set of spare parts for it.
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Post by thenewzolt on Mar 9, 2012 20:05:35 GMT -5
When you clean the carb, what do you clean? Did you remove and clean the pilot jet, the main jet and the float valve? It is most likely a clogged pilot jet, which runs the slow circuit, and the main jet runs the fast circuit, which is with the throttle open. It could also be the diaphragm is damaged or leaking. All of these problems would be solved with a new carb for $35 delivered. Buy a new carb, install it, then take the old one apart to see what the problem is. You now have a running scooter, and a new carb with a full set of spare parts for it. could you link me the carb for $35 delivered?
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Post by ce on Mar 9, 2012 21:15:54 GMT -5
just got to ebay motors and search for gy6 150 carburetor, get a 24mm and swap it out.
There's one for less than $30, and any one is good.
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