Description
YAMAHA YZ490 – 465 MONOSHOCK FRAME
Big-bore two-stroke power with a serious chassis upgrade.
Frame number 3K5-02125
This Yamaha YZ490 has been built around a 450-style monoshock frame, combining the raw, hard-hitting character of the legendary YZ490 with a more modern chassis and suspension setup.
The YZ490 is already an iconic machine, renowned for its huge torque, unmistakable two-stroke sound and brutal acceleration. This bike takes that character and puts it into a 450 monoshock chassis, giving it a much more contemporary feel and stance.
A seriously interesting machine for anyone looking for something different from the usual classic motocross bikes.
Highlights include:
• Yamaha YZ490 big-bore two-stroke engine
• 450 monoshock frame
• Modern monoshock rear suspension
• Improved chassis and handling compared with the original YZ490 layout
Full engine rebuild:
1. Strip casings & crankshaft
2. Supply & fit con rod kit, main bearings & seals
3. Rebore & new forged Wossner piston, rings & Gudgeon pin
4. Vapour blast
5. Rebuild with new seals & gaskets throughout
6. Strip, vapour blast & sonic clean carb. Rebuild with new parts. Jet to suit.
7. Replace kick-start assembly with new bearings
8. Fit new wiring loom and YZ490 full ignition system
