What makes a small engine backfire?

Question

I was burnishing some floors with a burnisher that has a fairly new 14 hp onan engine, propane with electric start. When I shut it off for a few minutes and started it back up, it backfired. Does anyone have a clue as to why it would do this?

Answer 1

if im thinking about this correctally... if the engine is running too rich it can cause a build up as you shut it off... if it is injected into the engine and not ignited... but im not 100% sure..... hope it helps

Answer 2

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RE:
What makes a small engine backfire?
I was burnishing some floors with a burnisher that has a fairly new 14 hp onan engine, propane with electric start. When I shut it off for a few minutes and started it back up, it backfired. Does anyone have a clue as to why it would do this?

Answer 3

Take it back. The gas is igniting outside the combustion chamber. Not only is it off but this will damage the engine long term

Answer 4

In a car it's from a spark plug

Answer 5

Fuel in the exhaust manifold, poss due to a leak;

Timing off.

I'ld get it checked. Especially if it happens again.

Answer 6

If the heads were removed, distributer not set in the cam gear properly, Timing chain off a tooth. Else the firing order wrong (wire crossed). or distributer mis adjusted. Broken rotor button. valves to tight. (Adjusted before they had proper oil pressure).

Answer 7

exhaust valve not opening consistantly(causes engine to run rough too), intake valve not closing consistantly, faulty carbeurator discharge, build-up of deposits on face of piston(throws off timing)

Answer 8

it was the bananas..don't use bananas next time...cabbage makes my husband backfire, luckily, i sleep on the couch.

Answer 9

spark plug