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A spark arrestor mounted on a muffler connected to an exhaust pipe of an engine includes a cylindrical portion including an opening that extends therethrough from the outside to the inside thereof, two cap members that respectively close first and second ends of the cylindrical portion, a mesh porti

A spark arrestor mounted on a muffler connected to an exhaust pipe of an engine includes a cylindrical portion including an opening that extends therethrough from the outside to the inside thereof, two cap members that respectively close first and second ends of the cylindrical portion, a mesh portion that covers the opening, and a tail pipe extending from the inside to the outside of the cylindrical portion through the cap member, wherein the exhaust flows outside the cylindrical portion in a first direction, and a channel where the exhaust flows in a second direction opposite to the first direction is provided inside the cylindrical portion.

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1. A spark arrestor mounted to a muffler connected to an exhaust pipe of an engine, the spark arrestor comprising: a cylindrical portion including an opening extending therethrough from an outside to an inside of the cylindrical portion, the cylindrical portion including a channel therein;two caps t

1. A spark arrestor mounted to a muffler connected to an exhaust pipe of an engine, the spark arrestor comprising: a cylindrical portion including an opening extending therethrough from an outside to an inside of the cylindrical portion, the cylindrical portion including a channel therein;two caps that respectively close first and second ends of the cylindrical portion;a mesh portion that covers the opening;a tail pipe extending from the inside to the outside of the cylindrical portion; anda guide portion extending across a space between the opening and an inlet of the tail pipe; whereinthe exhaust flows outside the cylindrical portion in a first direction along an axis of the cylindrical portion, and the exhaust flows in the channel in a second direction opposite to the first direction. 2. The spark arrestor according to claim 1, wherein the channel is arranged between the opening and the inlet of the tail pipe. 3. The spark arrestor according to claim 1, wherein an outer wall of the tail pipe defines a portion of the channel. 4. The spark arrestor according to claim 1, wherein the guide portion is arranged to guide the exhaust flowing from the opening into the inside of the cylindrical portion to a location located in the first direction from the inlet of the tail pipe. 5. The spark arrestor according to claim 1, wherein the opening is positioned in a location located in the first direction from the inlet of the tail pipe. 6. The spark arrestor according to claim 1, wherein a tip end of the guide portion in the first direction is positioned in a location located in the first direction from the opening. 7. The spark arrestor according to claim 1, wherein the opening is positioned in a location located in the first direction from the inlet of the tail pipe. 8. The spark arrestor according to claim 7, wherein the guide portion guides the exhaust in a direction orthogonal or substantially orthogonal to the second direction. 9. A muffler including the spark arrestor according to claim 1. 10. A straddle type vehicle including the muffler according to claim 9.