When is it obligatory to install a spark protector on a tractor?

1. When the tractor has an upper exhaust pipe.
2. When the engine’s mechanical condition is relatively poor.
3. When the tractor has an open exhaust pipe.
4. Correct answer: When the tractor has a lower exhaust pipe.

WhyA spark protector is required if the tractor has a low exhaust pipe. Sparks near the ground can set grass on fire.