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Post by bille on Apr 28, 2014 8:10:03 GMT -5
First, I'm brand new to scooters, but I am mechanically inclined, when I know what I'm doing  I just bought a 2014 Tao Tao BWS 150 scooter. It had 70 miles (or km, not sure which is being recorded) on it when I bought it. The guy I bought it from told me to put the highest octane gas in it. I only mention this because it could be related to my problem, but probably not. When I got it home I road around the streets of my neighborhood without any issues. However, today I took it on a real ride for the first time and it kept stalling on me. I first took it to the gas station and filled it up with ultimate grade gas. Then I went on a ride on roads that were mostly 40-45 MPH and had medium size hills. Every 3-5 miles it seemed, the scooter would start to loose power, and as I pulled to the side of the road it would stall. Attempts to restart it would not work until about 5 minutes or so passed and then it would start right up. This happened 5 times on the ride, which was only like 15-20 miles, at the most. Does anyone have any idea what's going wrong here? |
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Post by william42 on Apr 28, 2014 8:47:19 GMT -5
That's exactly what my 2013 model did, but not to that extreme. It started with my 2nd take of gas, which I over-filled with  octane gas. I don't know if over filling the tank was the problem or not but I switched to regular gas for my 3rd fill-up and the issue went away and seems to run the same with regular gas. My scooter had 72 miles on it when the issue started. With that said, and with the high price of high octane gas, I assume not a lot of people use it so does that gas get old sitting in the underground tanks at gas stations? I don't have a clue what my problem was. I only know that it went away when I used regular gas so I'm using that from now on. I'm going to PM you about another issue I'm having and could use your help. Please look for it... |
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Post by pauldog on Apr 28, 2014 9:07:45 GMT -5
Because the bike is so new you might want to do a complete PM. Pay special attention to the fuel lines and vacuum hoses. Make sure there r no kinks, clamps on all of them. New bikes sometimes come with hoses that are to long and can kink once they get warm. Check your gas cap and make sure it is getting ventilation. Lack of vacuum can stop gas flow. It sounds like a fuel flow issue. Next I would check your valves. They could be tight. The heat from running the bike expands the metal and closes the gap. Welcome to the Scooter world!
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Post by pepboyjoe on Apr 28, 2014 10:22:38 GMT -5
Hello Billie,
I have a 2012 Taotao evo 150 I never had that happened to me, the only thing that used to happened was, when ever I filled up the gas tank if I put to much gas in it, it would stall every time I would slow down and come to a stop, there is a vacuum line on top of the gas tank, that is for Hydrocarbons emissions, that line is vacuum to remove all the Hydrocarbons that the fuel makes and outs them inside the engine to be burnt, If you over fill the gas tank it will start taking raw fuel and then the engine would be too rich and stall, now what your bike is doing doesn't sound like this is the problem, To me it sounds like the bike is over heating and stalling because of that and once it cools down it turns back on, pretty much what Paul said about the valves opening when they are hot, If you are getting that hot it maybe running lean and you need to tune it.
Finding the tuning screw:
If you look at the carburetor on the left side,, there is a big copper cap, right underneath there is a small copper plug that is covering the tuning screw, there is alot of ways you can remove this and they all seem very hard, the way I removed mine was, I took a long flat head screw driver, I put the flat head on the aluminum covering the copper plug, only about an 1/8 of the screw driver is touching the alumni and very gently tap on the top of the screw driver, it will start digging into the aluminum until it reaches the plug and it will pop out once you reach it, (there is nothing wrong with making that grove on the carburetor it will not damage anything, its only a very small grove) Let me know if you need anything else, you can find the how to tune the carburetor on this forum or just Goggle it and it will come up, If you cant find a way let me know and I will explain it to you. have fun
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Post by bille on Apr 28, 2014 10:31:21 GMT -5
Here is something I just noticed, while it's idling on it's stand, the back wheel starts to spin for 5 seconds, then it slows down to a complete stop for 3 seconds, and then it keep repeating that over and over.
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Post by bille on Apr 28, 2014 11:41:06 GMT -5
I got the seat bucket out and found the gas line going from the fuel filter to the carb didn't have it's clamp on correctly. The line seemed to be connected fine without the clamp but I put the clamp back on.
I'm going to check the valves next, does anyone know what gauge the gap should be for the valves on a gy6 150cc? I did a quick google search and found answers of .003, .004 and .005.
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Post by william42 on Apr 28, 2014 18:10:59 GMT -5
My owners manual says .004in. so I set mine there and it's working fine. I was also told .oo4 by someone on this site.
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Post by jjoshua20213 on Apr 28, 2014 19:06:54 GMT -5
Sounds like a dead on fuel delivery problem. Sounds like your carb bowl is running dry, so either the tank is vapor locked(unscrew cap and here a suction noise) or your vacuum is weak. If its your tank idk, sorry never had this problem. If its a vacuum issue make sure the intake manifold is tightened and not cracked, check hoses for leaks. Take them off the manifold and suck on them and see if they leak air. If not no leak and its more than likely the tank problem.
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Post by alleyoop on Apr 28, 2014 19:21:50 GMT -5
It is running LEAN for some reason, what you are noticing with the wheel spinning then stopping then spinning again is called surging the rpms are bouncing up and down LOW RPMS TO HIGHER RPMS. So either you have an AIR Leak or the carbs Fuel Ratio Mixture is set to LEAN. If set to Lean turn it Counter Clockwise 1/4 at a time to get the highest IDLE then set your idle Using the IDLE SPEED screw to lower the Idle to 1500-1800 and the rear wheel not spinning. And running lean would also cause it to overheat and die on you and not start until it cooled off a little.
Alleyoop
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Post by bille on Apr 28, 2014 20:05:13 GMT -5
Sounds like a dead on fuel delivery problem. Sounds like your carb bowl is running dry, so either the tank is vapor locked(unscrew cap and here a suction noise) or your vacuum is weak. If its your tank idk, sorry never had this problem. If its a vacuum issue make sure the intake manifold is tightened and not cracked, check hoses for leaks. Take them off the manifold and suck on them and see if they leak air. If not no leak and its more than likely the tank problem. When I remove the gas cap I hear a suction noise...is that good or bad? |
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Post by bille on Apr 28, 2014 21:53:48 GMT -5
ok, it took hours but I finally found the engine under all the trim pieces. I tried to take off the valve cover but there is a bar wielded in the way so the cover can't be taken completely off. But I was able to get it off enough to get to the screw. I couldn't get a 004 or 005 feeler into either valve, they were too tight. I loosened them both so I could get a 005 in and out, but it would drag. I also put a new autolite 4194 gauged at .032. Putting it all back together now to test it out. I will leave the trim off because I think I will need carb adjustments next but for now, lets make sure the bike still runs |
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Post by bille on Apr 28, 2014 22:42:06 GMT -5
It started right up. Idled fine for a couple of minutes, I didn't rev it because it's late and neighbors are sleeping. I will play with it more tomorrow. Thanks for all your help.
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Post by jjoshua20213 on Apr 29, 2014 8:21:17 GMT -5
If you hear the suction noise your tank could be sucking gas and not replacing it with air, and creating a vacuum inside the tank that is preventing gas from leaving the tank.
Your valves could be the culprit too.
Does it stall while riding? or only at stops?
If its only at stops its your valves.
Do you have to gas it a little to get it started? thats a siggn of your valves needing adjusting too.
I would adjust both of the, to a a .004 where you can still get the .005 in with mild force.
If the carb is adjusted adequately the bike should start within 1.5 secs cold and 1 secs hot, with electric starter or with 1 kick hot or cold. Or at least thats how I have all the bikes I've worked on trained.
And that silver bar in front of the valve cover should be attached to the valve cover and bolted onto the head. Just unscrew it, it takes the same 8mm as the cover screws.
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Post by bille on Apr 29, 2014 8:56:23 GMT -5
If you hear the suction noise your tank could be sucking gas and not replacing it with air, and creating a vacuum inside the tank that is preventing gas from leaving the tank. Your valves could be the culprit too. Does it stall while riding? or only at stops? If its only at stops its your valves. Do you have to gas it a little to get it started? thats a siggn of your valves needing adjusting too. I would adjust both of the, to a a .004 where you can still get the .005 in with mild force. If the carb is adjusted adequately the bike should start within 1.5 secs cold and 1 secs hot, with electric starter or with 1 kick hot or cold. Or at least thats how I have all the bikes I've worked on trained. And that silver bar in front of the valve cover should be attached to the valve cover and bolted onto the head. Just unscrew it, it takes the same 8mm as the cover screws. When it stalls, while riding I feel the power bogging down, the bike starts to drop speed and as I stop it stalls. Right now I have the valves set to were you can get a .005 in with mild force. This morning, starting up cold, it would start right up then stall. It did this 3 or 4 times and then started up. After it warmed up, the back tire continued to spin. |
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Post by jjoshua20213 on Apr 29, 2014 9:04:12 GMT -5
To eliminate the gas tank issue simply run it without the cap. If the gas level is low enough and there are no major cracks in the road you should be good spillage wise. If it runs good then drill a small hole in the gas cap for ventilation.
On the other hand if your idle randomly increased you have a vacuum leak and air is gettin in somehow.
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octane gas. I don't know if over filling the tank was the problem or not but I switched to regular gas for my 3rd fill-up and the issue went away and seems to run the same with regular gas. My scooter had 72 miles on it when the issue started. 
..BAD TO THE BONE..