TaoTao 110c- Spark, Fuel, Compression, no start?
#11
Hey Promagstyle:
The TaoTao I'm working on is the 110cc version, but I don't think the two sizes differ much.
What Zrock was talking about is replacing the gas line between the fuel tank and the carb and putting on a longer tube attached to the carb. Then lightly blowing fuel into the carb until the bowl is full.
I think before you do that, you should try some basics. First, check to see if your spark plug is making spark. Pull the plug out of the cylinder and put it into the spark plug boot. Then, just set it on the cylinder fins or somewhere that is grounded. You want to make sure that the end of the plug is very close or touching the metal. Turn on your key, put your kill switch in the run position and try to start. If you're getting spark, you'll be able to see the blue arc on the spark plug.
If you're getting spark, that's great! Next, put your finger over the open spark plug hole and try to start again. There should be enough compression to push your finger off the hole with a little "pop" sound. This was my issue, I didn't have enough compression to start the ATV. I replaced my head gasket and went from 36 PSI to 98PSI. My timing is off now because I'm getting back fires, but that should be easy to research and fix. I bought a compression gauge from my auto parts store to test to get exact compression.
If you have good compression and spark, next to check is fuel. There is a small screw on the right, or what I would consider the passenger side of the carb. It's at the bottom of the carb bowl. Mine didn't have it, but there should be a black hose running from the bottom of the carb that hangs down past the motor not connected to anything. This is the float bowl overflow tube. When you turn the small screw, watch for fuel to start dripping from that tube. This will let you know you have fuel in your carb.
If all those things check out, then you might want to get your compression tester. I had spark and fuel and air, I cleaned the carb, set the valves and still wouldn't fire, that's when I saw the exhaust exiting at the head gasket.
The other thing I found (from friendly help on this site) is that even though you may see spark, that doesn't necessarily mean the ignition is working. There are a lot of security prevention devices on this little quad and they'll need to be connected and working in order for the ignition to work. There's a tether switch on the back rack that needs to have the black cap pushed on and the foot brake pedal needs to be depressed in order to start.
Hope some of this is helpful! Let us know what some of these tests yield and we'll see if we can help more.
Thanks!
The TaoTao I'm working on is the 110cc version, but I don't think the two sizes differ much.
What Zrock was talking about is replacing the gas line between the fuel tank and the carb and putting on a longer tube attached to the carb. Then lightly blowing fuel into the carb until the bowl is full.
I think before you do that, you should try some basics. First, check to see if your spark plug is making spark. Pull the plug out of the cylinder and put it into the spark plug boot. Then, just set it on the cylinder fins or somewhere that is grounded. You want to make sure that the end of the plug is very close or touching the metal. Turn on your key, put your kill switch in the run position and try to start. If you're getting spark, you'll be able to see the blue arc on the spark plug.
If you're getting spark, that's great! Next, put your finger over the open spark plug hole and try to start again. There should be enough compression to push your finger off the hole with a little "pop" sound. This was my issue, I didn't have enough compression to start the ATV. I replaced my head gasket and went from 36 PSI to 98PSI. My timing is off now because I'm getting back fires, but that should be easy to research and fix. I bought a compression gauge from my auto parts store to test to get exact compression.
If you have good compression and spark, next to check is fuel. There is a small screw on the right, or what I would consider the passenger side of the carb. It's at the bottom of the carb bowl. Mine didn't have it, but there should be a black hose running from the bottom of the carb that hangs down past the motor not connected to anything. This is the float bowl overflow tube. When you turn the small screw, watch for fuel to start dripping from that tube. This will let you know you have fuel in your carb.
If all those things check out, then you might want to get your compression tester. I had spark and fuel and air, I cleaned the carb, set the valves and still wouldn't fire, that's when I saw the exhaust exiting at the head gasket.
The other thing I found (from friendly help on this site) is that even though you may see spark, that doesn't necessarily mean the ignition is working. There are a lot of security prevention devices on this little quad and they'll need to be connected and working in order for the ignition to work. There's a tether switch on the back rack that needs to have the black cap pushed on and the foot brake pedal needs to be depressed in order to start.
Hope some of this is helpful! Let us know what some of these tests yield and we'll see if we can help more.
Thanks!
#12
Hey Promagstyle:
The TaoTao I'm working on is the 110cc version, but I don't think the two sizes differ much.
What Zrock was talking about is replacing the gas line between the fuel tank and the carb and putting on a longer tube attached to the carb. Then lightly blowing fuel into the carb until the bowl is full.
I think before you do that, you should try some basics. First, check to see if your spark plug is making spark. Pull the plug out of the cylinder and put it into the spark plug boot. Then, just set it on the cylinder fins or somewhere that is grounded. You want to make sure that the end of the plug is very close or touching the metal. Turn on your key, put your kill switch in the run position and try to start. If you're getting spark, you'll be able to see the blue arc on the spark plug.
If you're getting spark, that's great! Next, put your finger over the open spark plug hole and try to start again. There should be enough compression to push your finger off the hole with a little "pop" sound. This was my issue, I didn't have enough compression to start the ATV. I replaced my head gasket and went from 36 PSI to 98PSI. My timing is off now because I'm getting back fires, but that should be easy to research and fix. I bought a compression gauge from my auto parts store to test to get exact compression.
If you have good compression and spark, next to check is fuel. There is a small screw on the right, or what I would consider the passenger side of the carb. It's at the bottom of the carb bowl. Mine didn't have it, but there should be a black hose running from the bottom of the carb that hangs down past the motor not connected to anything. This is the float bowl overflow tube. When you turn the small screw, watch for fuel to start dripping from that tube. This will let you know you have fuel in your carb.
If all those things check out, then you might want to get your compression tester. I had spark and fuel and air, I cleaned the carb, set the valves and still wouldn't fire, that's when I saw the exhaust exiting at the head gasket.
The other thing I found (from friendly help on this site) is that even though you may see spark, that doesn't necessarily mean the ignition is working. There are a lot of security prevention devices on this little quad and they'll need to be connected and working in order for the ignition to work. There's a tether switch on the back rack that needs to have the black cap pushed on and the foot brake pedal needs to be depressed in order to start.
Hope some of this is helpful! Let us know what some of these tests yield and we'll see if we can help more.
Thanks!
The TaoTao I'm working on is the 110cc version, but I don't think the two sizes differ much.
What Zrock was talking about is replacing the gas line between the fuel tank and the carb and putting on a longer tube attached to the carb. Then lightly blowing fuel into the carb until the bowl is full.
I think before you do that, you should try some basics. First, check to see if your spark plug is making spark. Pull the plug out of the cylinder and put it into the spark plug boot. Then, just set it on the cylinder fins or somewhere that is grounded. You want to make sure that the end of the plug is very close or touching the metal. Turn on your key, put your kill switch in the run position and try to start. If you're getting spark, you'll be able to see the blue arc on the spark plug.
If you're getting spark, that's great! Next, put your finger over the open spark plug hole and try to start again. There should be enough compression to push your finger off the hole with a little "pop" sound. This was my issue, I didn't have enough compression to start the ATV. I replaced my head gasket and went from 36 PSI to 98PSI. My timing is off now because I'm getting back fires, but that should be easy to research and fix. I bought a compression gauge from my auto parts store to test to get exact compression.
If you have good compression and spark, next to check is fuel. There is a small screw on the right, or what I would consider the passenger side of the carb. It's at the bottom of the carb bowl. Mine didn't have it, but there should be a black hose running from the bottom of the carb that hangs down past the motor not connected to anything. This is the float bowl overflow tube. When you turn the small screw, watch for fuel to start dripping from that tube. This will let you know you have fuel in your carb.
If all those things check out, then you might want to get your compression tester. I had spark and fuel and air, I cleaned the carb, set the valves and still wouldn't fire, that's when I saw the exhaust exiting at the head gasket.
The other thing I found (from friendly help on this site) is that even though you may see spark, that doesn't necessarily mean the ignition is working. There are a lot of security prevention devices on this little quad and they'll need to be connected and working in order for the ignition to work. There's a tether switch on the back rack that needs to have the black cap pushed on and the foot brake pedal needs to be depressed in order to start.
Hope some of this is helpful! Let us know what some of these tests yield and we'll see if we can help more.
Thanks!
#13
Well, I think I finally got my issue resolved. After installing the new head gasket, I was getting a lot of backfire and no start. Another trip to the forum and I found it was simply the Air/fuel adjustment screw. After playing around with that a little, the little quad finally fired right up. It needs a little more tuning to get the idle down and I think I have the needle valve in backwards, but those are little things.
Thanks everyone for your suggestions and help. Zrock, that fuel in a spray bottle worked like charm. Let me ask, do you keep fuel in there all the time, or just put in new, fresh fuel when you need to? I was wondering if you keep it in there all the time if you treat it with seafoam or stay-bil fuel treatment.
Thanks everyone for your suggestions and help. Zrock, that fuel in a spray bottle worked like charm. Let me ask, do you keep fuel in there all the time, or just put in new, fresh fuel when you need to? I was wondering if you keep it in there all the time if you treat it with seafoam or stay-bil fuel treatment.
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