Its scarce, just try to find a 3rd mainshaft cluster gear for a 81 YZ 465, very hard to find. We have thirty-one specific parts lists available for this model.Wasnt the 465s 5 speeds and the 490s 4 speeds?Ive seen quite a few swap meet 465/490s Primary gears on back of Clutch baskets and shift drums were different too. The Yamaha YZ465 1980 (A) USA has thirty-one Other parts fiches. To discover exactly which parts you require use the on-line schematic exploded diagram - it will even give you some idea of where and how to fit those new parts. Sadly, the 490 was heavier than the 465, nowhere near as reliable, difficult to start, had grim suspension. The Yamaha YZ490 was introduced in 1982 (following in the footsteps of the YZ465).Comprising of the RCT slip-on exhaust and a choice of two headers, the 4.1 RCT is the first choice for many teams in AMA Supercross Series, AMA Motocross Series, FIM … We are kicking off with another industry favourite, the FMF 4.1 RCT system. FMF 4.1 RCT 4 Stroke Dirt Bike Exhaust System.Photo Credit: Yamaha Unfortunately for big bike enthusiasts, however, this “bigger is better” strategy turned out to backfire. Portly, ponderous and ill-handling, the original YZ490 was not nearly the follow-up the Yamaha faithful were hoping for. In 1982, Yamaha retired the legendary YZ465 and introduced the world to its successor, the YZ490.You have do something about the brake plate too.The Yamaha YZ490 was introduced in 1982 (following in the footsteps of the YZ465). I fitted a yz 490 rear wheel into a 1980 yz 465 swing arm but it required milling the axle slot to accept the larger axle spacers etc. The 1981 and later axles are larger diameter. YZ465 1980-1981 YZ490 1982-1984 Hopefully someone who has one of these bikes can shed some light on the problem Here is the link to the other forum | Quote I love the smell of 2stroke in the morning fookyoo Posts: 83 Joined: Location: Dallas, TX USA 11:40 AMThe YZ465/490's should be stamped 18 x 2.50. The Yamaha YZ490 was introduced in 1982 (following in the footsteps of the YZ465). Water cooling - Exhaust power valve - Two small auxiliary exhaust ports - Six transfer ports plus boost ports (from the intake) The Kawasaki KX 500 cylinder is also impressive.
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