The TM400 was Suzuki’s first serious production open-class motocross bike. The company had been racing hand-built works bikes and winning, and this production version promised to have world class power. Bundle that power with lousy shock and fork damping, and a flexible frame with bad geometry and you got a bike that was a real handful. On top of that, the motor features the aptly named Pointless Electronic Ignition, with an electronic advance curve. The electronics advanced the ignition based on voltage output, not rpm and it was not very accurate. You'd be trying to manage the ill-handling bike in the dirt and, with no real warning, the power would come on. Sometimes it would hit at 4000rpm, sometimes 5000, sometimes 4500, and it always seemed to do it in mid-corner. Suzuki added heavier flywheels to calm it down, and fixed the ignition advance issue completely for 1975. Now a TM400 with the more predictable ignition, good shocks, and a braced frame you'll have one of the fastest bikes in a vintage MX race, but still not much of a handler compared to a Maico or CZ.