Hey guys. I picked up a new carb for my chinese atv. Installed it but atv will not start. This is what I did in detail. I mounted the carb, hooked up throttle cable, installed new fuel line from the tank, installed new filter and installed new petcock. I have fuel to the bowl. I put fuel in the plug hole and it fired up for a second. This is an electric choke. I can not get this thing to start. Any suggestions?

 

Squirt a small quantity of fuel or easy-start down the air intake to the carb. Sometimes the protective stuff they put in the new carb can restrict the jets, and it needs a bit of help. A hand over the intake may work if the excess fuel method doesn't. If nothing works, remove and clean the new carb out. Just one point, why did you fit it? If it didn't run on the old carb, and won't run on a new one, it may not be a carb problem, a poor spark or low compression perhaps.

 

Thank you for the response. I have tried gas in the cylinder with it fired up for a second. Tried started fluid in the intake and it fired for a second. But on its own will not start. Spark plug is dry after trying to start it. Checked fuel flow and I have steady stream coming out of the bowl drain. I am no mechanic but it seems to me like the fuel is either not getting from the lower part of the carb to the upper and in to the cylinder. I replaced the carb because the bowl was cracked on the old carb. I will take the carb off today and clean the jets, who knows, maybe something got in there. I am using fresh gas. This is frustrating hobby but I am a persistent and patient person on a mission to get this started.

 

Nee twist. This is a PD24J carb and has a vacuum line from the diaphragm that is supposed to go to the intake manifold and has a splitter that is also supposed to go to the petcock. I have just an on/off petcock with no vacuum line nipple. As I crank I can feel air pushing through that splitter. Do I get a different petcock with a vacuum nipple? Do I run that line somewhere else? Do I cap it off?

 

You need the vac line to go direct from carb to manifold, any pipe into the manifold must not suck air, but I have never come across a carb with a vac pipe connected to the manifold, are you sure you got this right when you dismantled the original set up?

 

Merry, I figured out the vacuum. The vacuum line comes off the the diaphragm on the carb and one side of the “y” goes to the intake manifold and the other is supposed to go to a diaphragm on the petcock. I do not have that style petcock so I read to just cap that side off. The best part is I got the engine started and she is purring like a kitten. The new carb did have some packing stuck in the jets.