I have Maurray 42536x92a twin engine with 42" Cut with 17 hp B&S twin II,. It truns one with Choke on... but as soon as I puch choke down... it turns off the mower... what can be the issue... also is it safe to run mower all the time with choke on at full... please help... what can I do to fix it... it was working fine yesterday... Please help

A full choke greatly increases the richness of the fuel mixture by changing the ratio of air to fuel, starves air. You should not run the engine on fuel choke because, although it may run, the chances that you have a good mixture or ratio is very very slim. You have a carb issue that needs fixing. Right now your carb is supplying not enough fuel so the normal mix of air is too much, chokes lowers the amount of air. In short, your carb is gummed up and needs cleaning. If you want to try we can help or you can take it to a repair shop and feel safer, but poorer