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Briggs & stratton 15 hp lawn mower engine?

I have a riding lwn mower with a Briggs & Stratton 15 hp engine model #28N707, Diamond Plus. My lawn mower will start but but the rpms have to be kept high in order for it to stay running. It also back fires.
Robert, July 2009
takeing out an onan 14 hp,no governer, installing a 15 hp brigs, question, how about the wireing, with an electric clutch , is it posible to incorperate the original wireing,or would it be better to just rip out everything and start from scratch with the wiring? i worked on 10 million dollar machinery for a liveing for 40 years, might be qulafied ?

charles moody, September 2009
Both symptoms point to fuel shortage. Dirty carburettor, fuel valve not fully open, partial blockage (dirt ) in fuel line.

Geoff, August 2009
link Click here to see other fixes for Briggs & Stratton 28N707.