Dirt Wheels Magazine - YAMAHA TRI-Z 490 In honor of 3-wheeler Thursday Robert Boyter stuffed a big YZ490 engine into his Tri-Z 250 frame. Be ready to hang on when you hit
MX HISTORY: THE YZ400 TWO-STROKE - Dirt Bike Magazine
1982 YAMAHA YZ490 J Euro model | race ready - SOLD | moto life