| 摘要 |
PROBLEM TO BE SOLVED: To avoid disturbing a driver with noise from a control valve by integrally mounting the control valve in the upper end of an air cleaner arranged below a seat. SOLUTION: An air cleaner 19 arranged below a seat 9 comprises an air cleaner box main body 19a connected with the upstream end of an intake duct 18, a cover installed freely removably to the opening part 19b of the air cleaner box main body 19a, and an air cleaner element 19b installed inside. A secondary air inlet device 21 burning a fuel content in burnt gas is constructed of an air inlet pipe connecting a control valve 22 and an exhaust passage inside a cylinder head together and a control pipe 25, and the control valve 22 is fixed to the air cleaner 19 with an air inflow pipe 26 projecting in the lower part opposed to a clean chamber 20 in the air cleaner 19. Although the control valve 22 causes noise when its internal reed valve opens/closes repeatedly, the noise can be shut off by the seat 9 because the control valve 22 is integrally mounted in the upper end part of the air cleaner 19 arranged below the seat 9. |
