I have a MTB 5hp Rototiller, and when I have it in choke it runs fine, but drop it in to run and dies... Any help appreciated. Thanks! =)

If you have not changed any of the mixture screw settings then I'd say you need to drop the bowl of the barb, clean it and the needle valve and seat.

Or the high Speed mixture screw (The fatter one) is too tight.

Where could I get a diagram?

MTD is the company that bolts all the parts together to make a machine. Who made the engine, B&S?

Alrighty... Ummm Yes, It's a Briggs and Stratton Need a Diagram, or need to know where these different parts are, Also... I need to know what kind of Oil does this puppy take? Thanks

Try MTD Products Landing Page (model and serial required)

Parts & Accessories | Shop & Find Lawn & Garden, Appliance Parts at Sears PartsDirect | SearsPartsDirect.com (model #)

Home - Briggs & Stratton (Engine # and type code which is STAMPED on the blower housing. Difficult to see.

It's best to use small engine 4-cycle oil, otherwise 30 wt
Non-detergent oil.

Use at least the mid-grade gas and use a fuel stabilizer like Sta-bil.