What are the symptoms of a bad motorcycle bearing?

1 Answers
Denise
07/29/25 5:42pm
Symptoms of a bad motorcycle bearing include loud noises, increased risk of cylinder scoring, accelerated part wear, and a knocking sound when giving throttle. Here are some related details: Causes of damage: Repeated burning of main bearings and connecting rod bearings weakens the support at the burnt areas. Fractures often occur at the root of the connecting rod journal for cylinders 2 and 5 (taking a six-cylinder engine as an example), issues with main journal concentricity, and improper maintenance. There are many factors contributing to crankshaft damage, which involves high technical requirements. The crankshaft bears heavy loads within the engine, with fractures typically occurring between the main journal and connecting rod journal. Excessive clearance: Excessive clearance between adjacent main bearings, especially between the rear two and front two main bearings. Due to the relatively thin crank webs, the crankshaft is heavily loaded at both ends with the flywheel at the rear and the pulley at the front. The crankshaft also directly or indirectly drives other components like the camshaft. Additionally, uneven front and rear loads on the crankshaft, combined with individual cylinders not functioning, create inconsistent stress on the crankshaft, despite its potential to operate for millions of kilometers.
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