The is an organization that sets automotive standards in Japan, analogous to the

Society of Automotive Engineers SAE International, formerly named the Society of Automotive Engineers, is a United States-based, globally active professional association and standards developing organization for engineering professionals in various industries. SAE Internatio ...

(SAE) in the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

. JASO also sets standards for grades of

oil An oil is any nonpolar chemical substance that is composed primarily of hydrocarbons and is hydrophobic (does not mix with water) & lipophilic (mixes with other oils). Oils are usually flammable and surface active. Most oils are unsaturated ...

; the highest grade for

two-stroke A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a Thermodynamic power cycle, power cycle with two strokes (up and down movements) of the piston during one power cycle, this power cycle being comple ...

engine An engine or motor is a machine designed to convert one or more forms of energy into mechanical energy. Available energy sources include potential energy (e.g. energy of the Earth's gravitational field as exploited in hydroelectric power gen ...

s being

JASO FD Jaso or JASO may refer to: * Jaso State, a princely state in British India * Japanese Automotive Standards Organization (JASO), an organization that sets automotive standards in Japan ** JASO T904, a quality classification standard of four stroke m ...

, and JASO MA for

four-stroke A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either directio ...

engines (

motorcycle A motorcycle (motorbike, bike, or trike (if three-wheeled)) is a two or three-wheeled motor vehicle steered by a handlebar. Motorcycle design varies greatly to suit a range of different purposes: long-distance travel, commuting, cruising ...

s). JASO is part of the .

M 345 "2-cycle gasoline engine-lubricating oil-performance classification"

It stipulates the lubricating oil used in 2-stroke gasoline engines such as motorcycles, general-purpose machines, and outboard motors, and was established in 1994. For 2-stroke oil, lubricity, cleanliness, exhaust smoke and exhaust system blockage are evaluated by the test methods specified in JASO M 340, M 341, M 342, and M 343, and the grades are FB, FC, and FD. Performance is categorized. FA has been abolished, but the performance classification is positioned as follows. ;FA: It has the minimum performance for a two-stroke engine. ;FB: Especially excellent in lubricity and cleanliness compared to FA. ;FC: Low smoke type with excellent exhaust smoke and exhaust system blockage compared to FB. ;FD: Improved cleaning performance at high engine temperatures compared to FC. In addition, FB, FC, and FD of this standard are adopted as EGB, EGC, and EGD, respectively, as

ISO standards The International Organization for Standardization (ISO ) is an international standard development organization composed of representatives from the national standards organizations of member countries. Membership requirements are given in Art ...

References

External links

JASO standards

JSAE (parent organization)
Standards organizations in Japan Trade associations based in Japan Automotive standards {{Japan-org-stub

M 345 "2-cycle gasoline engine-lubricating oil-performance classification"

See also

References

External links