150cc Sahara backfiring when letting off after full throttle

[Superman]

I'm considering picking up a Sahara 150cc. The guy says when running flat out as soon as he lets off the gas the engine will backfire. Any thoughts on what would be causing that?

[metalstudman1]

This issue can be the cause of many things but ususally doesn't indicate any type of engine problem. All of my toys backfire on deceleration due to :less restictive muffler,insulation removal or deterioration. The backfire is simply igniting unburned fuel gases still in the pipe or muffler. Think of a safety gas can or fuel cell- the addition of foam or like product doesn't allow the fuel/air mix combined with heat to combust as easily- that's the same thing the sound insulation does in a muffler.

[Superman]

Well I had a friend test drive it who was mechanically inclined and I trust so I bought it for $600.00.

It needs a new passenger seat belt, reverse cable, and the headlights re-wired.