A gas lawn mower is a lawn mower which is powered by gasoline.

My weed eater lawn mower was expose to the wet weather and now it not staying on

No, it is not necessary to remove it. You can charge it right there on the mower.

Changing the deck belt on the Huskee IT4200 lawn mower involves working around the spring and 2 belt drive guides in the motor area. Properly loading the spring before the guides is the secret to success.

On a riding mower, there's typically a lever to the right side of the seat for this.