Honda WT20X Owner's Manual page 25

5. Spark arrester maintenance (optional part)
m#m
The muffler becomes very hot during operation and remains hot
for a while after stopping the engine. Be careful not to touch the muffler
while it is hot. Allow it to cool before proceeding.
1. Remove the eight 5 mm screws @ from the muffler protector 0, and
remove the muffler protector.
2. Remove the 4 mm screw @ from the spark arrester 0, and remove the
spark arrester from the muffler 0.
WT30X
and WT4OX
WT20X
uses two 4 mm
screws
21