When i push the primer button, there is no gas squirting out of the venturi but instead, I believe the air from the primer button is all coming out of a passage just inside the throat of the carb near the primer air passage. I'm not sure but maybe this passage is called the main air jet? It looks like it has a brass insert in it. If I block this passage with a thick wire and push the primer button, fuel will squirt from the venturi. Also the engine seems to run the same whether or not I block this passage, although I probably didn't create an air tight seal around it. Does anyone know why I have to block this passage to get the carb to send gas up the venturi or how I can fix this? Would it hurt anything to permanently block the passage with something like a piece of a gasket glued around it or would that make the engine run poorly? The carb is a briggs and stratton 498170 as pictured below. (not an actual pic of my carb) Other than this issue, the engine runs fine. I have replaced the primer bulb, the air cleaner housing and bowl gaskets, and cleaned the carb with aerosol carb cleaner. [IMG]http://t2.gstatic.com/images?q=tbn:ANd9GcShMM997icumH2iGy8AbLgGtxhnqHha0BKoM7fWtSOn61vdq_I&t=1&usg=__dkuiQSAXItejWOvrJoWA__tFlp8=[/IMG]

I have a situation on my Husqvarna YTH150 rider that confuses me. It has a push/pull switch for the mower start and a couple weeks ago, to my dismay, I pulled the button to engage the mower and .....nothing. Sitting thinking what to do, it engaged after a few seconds. Yesterday, same thing however I had to play with the switch a few times for it to engage, and then I couldnt stop for fear it wouldnt start again. The part that confuses me is the extended delay. If it just plain didnt work I could address that, but it seems a electrical issue would be definitive (either it works or not) What would cause this symptom?