The Scary Truth About Used Motorcycles: Ninja 400 Engine Fail

Buying a used motorcycle can be a dream or a total nightmare. In today's episode, we tear down a Kawasaki Ninja 400 engine that looked perfect on the outside but failed after only a few miles. Watch as we uncover the "dirty tricks" used to hide serious mechanical issues: Broken bolts hidden by sealant. Severe bearing failure (spun bearings) and aluminum debris. A warped crankshaft with 0.09mm runout. Evidence of a cheap, poor-quality previous overhaul. If you are planning to buy a second-hand bike, this video is a must-watch! Don't let a shiny exterior fool you. What we cover in this video: 0:00 - The risks of buying used bikes 1:15 - Hidden "sealant" hacks and broken bolts 3:15 - Checking the cylinder head & camshaft 5:10 - The oil pan mystery: Aluminum vs. Copper debris 7:20 - Measuring crankshaft runout and damage Support the channel: 👍 Like this video if it helped you! 🔔 Subscribe for more engine teardowns and restoration tips.