I recently bought a Baja Warrier mini bike used and it has a 196 cc Predator engine. The problem I am having is the engine will start up and run on half choke, but after proper warm up, when I take the choke off, it will die immediately. I have made several attempts at cleaning the carb and cleaning out the fuel tank, bought a new spark plug, put new gaskets on, but still the same problem. Does anyone know what may be causing this? I recently ordered a new carb and awaiting its arrival, but I dont know if the new carb will fix the problem or not. By the way, when I removed the sediment bowl, there was a white chalky substance in the shut off valve area, and there was also some grit in the tank and some water. As I mentioned, I cleaned out the tank and have cleaned the carb with carb cleaner and used a small diameter wire to run through the jets.:shrug:
Low speed (idle) jet is probably clogged. It is the black plug looking thing below the idle speed (rpm) screw. Remove that screw and pull it out. Look at it from the bottom, there will be a tiny hole that only goes up thru to a big hole that goes from side to side. Clean that small hole out. It doesn't take much to clog it.
Tried cleaning the jet under the idle screw. It seemed to run a little better, as at least it would run with the choke off but it still did not want to idle when it came to a stop. To get it to start pulling out at first, I would have to push the bike a little with my feet on the ground to get it started out, and it would cut out once in a while and it would surge and start jerking when coming to a stop.
There is an idle screw and right under it is a black plastic jet that is inserted by just pushing it straight down (no threads) I pulled it out, cleaned it with a wire, and pushed it back in. It seemed to run just a little better, but still not right. I have a new carb ordered on its way and hopefully that will cure the problem. If not, I am going to purchase the 212 cc Predator engine. I bought one of those and put in on my dune buggy. Has lots of power. Only downfall is the oil senser kicks in when I make a sharp right hand turn and it cuts itself off.
Re-jetting might be an option I will try if a new carb does not solve the problem. By the way, I was trying to get the engine adjusted with the air filter off the engine. Would this have contributed to the engines problem? It is the stock air filter, but it was not on the engine while I was working with it. Does it need to be in place and tightened down?
Isn't there a idle screw up where the throttle butterfly stops. Like a phillips head screw. Not sure I am describing it right.
The screw right to the right by the throttle arm on this one. I know it isn't the same engine but, close.
The screw right to the right by the throttle arm on this one. I know it isn't the same engine but, close.
Idle speed screw is on the carb.