Title: Two-stroke engine having variable exhaust port timing

Abstract: Two-stroke engine having variable exhaust timing, which includes an exhaust timing control member disposed in the exhaust passage in the vicinity of the exhaust port. The member is of an elongated configuration having a diameter gradually decreasing from the opposite ends to the intermediate portion to provide an external contour of an arcuate sectional configuration. The member is divided into two parts at the intermediate portion in order to facilitate to assemble it in the engine.

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Inventors: Oku, Yuji (Iwata, JP)
Tsuyama, Yasuharu (Iwata, JP)

Application Number: 916751
Filing Date: 1978-06-19
Publication_date: 1980-05-13
Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Iwata, JP)
Primary Class(es): 123/65PE 123/65A, 123/65V, 123/190.9
Other Classes:
US Patent Ref:

1011748	Dec, 1911	Coffin	123/65.
4121552	Oct, 1978	Mithuo et al.	123/65.

Other Refs: 500899774366189194272753292159

Mar, 1920	FR
Dec, 1934	FR
Nov, 1922	GB
Jun, 1927	GB
Nov, 1928	GB

Primary Examiner: Myhre, Charles J.
Assistant Examiner: Moy, Magdalen
Attorney: Clarke; Dennis P.