Yamaha MX400 Dirt Bike (1975)

The 1975 Yamaha MX400, specifically the MX400B model, was a landmark motocross motorcycle, celebrated for its potent 397 cc, air-cooled, two-stroke engine producing 38.76 horsepower. This model was pivotal in making Yamaha's revolutionary Monoshock suspension system widely available to the public.

The 1975 model year represented a significant evolution for Yamaha's motocross lineup. The MX400B was a mass-produced, more accessible alternative to the high-performance YZ models, yet it still featured the innovative single-shock rear suspension. This configuration made the 1975 MX400B a unique, "one-year bike," with an engine largely new for this model, sharing some crankshaft components with Yamaha's 360 and 400 enduro models, though its pistons were distinct. This marked a clear shift in Yamaha's motocross strategy. FAQ:

Q: How do I confirm if a part fits my 1975 Yamaha MX400?

A: To ensure perfect compatibility, please use the year and model selector at the top of the page.