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The original YZ250 of 1974 used an air-cooled 250cc two-stroke engine of 70 mm bore and a 64 mm stroke, which was improved semi-annually. The air-cooled motor was replaced in 1982 with a 249 cc liquid-cooled two-stroke reed-valved engine with a mechanical, rather than servo-driven, YPVS exhaust valve for a wider spread of power. Although other ...
Yamaha was the first to build a production monoshock motocross bike (1975 for 250 and 400, 1976 for 125) and one of the first to have a water-cooled motocross production bike (1977 in works bikes, 1981 in off-the-shelf bikes). Yamaha's first Motocross competition four-stroke bike, the YZ400F, won the 1998 USA outdoor national Championship with ...
YDS-3 (1964) 246 cc, two-stroke, parallel-twin, it used the world's first oil injection lubrication system in a 2-stroke engine. [2] DT-1 (1968) Yamaha's first true off-road motorcycle. [1] XS-1 (1970) Yamaha's first four-stroke engine motorcycle (650 cc twin). [3] YZ Monocross (1975) First production motocross bike with a single rear shock. [3]
There were several models, the 1985 RZ350F, 1986-92 RZ350F2,N,NF, and the 1992-5 RZ350RR which was produced in Brazil. The picture shown to the right is a model with an aftermarket "Expansion Chamber" which was a higher flowing, high-performance exhaust system, devoid of the catalytic converter and other exhaust pollution control items.
Here's how to distinguish "sundowning"—agitation or confusion later in the day in dementia patients—from typical aging, from doctors who treat older adults.
One day, Anna Costley stumbled upon TikTok videos of people participating in the Google Maps trend, in which users reminisce over photos of their old homes taken from satellite images over the years