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What Causes the Abnormal Noise in Honda 190 Engine?

1 Answers

MacTravis

08/27/25 2:29am

Honda 190 engine abnormal noise may be caused by the following reasons: Excessive clearance between piston and cylinder wall: Piston pin assembled too tightly or connecting rod bearing assembled too tightly; Excessive clearance between tappet and its guide hole; Wear of cam profile; Sometimes, the starter pawl is loose causing pulley noise (especially noticeable during speed changes). Excessive valve clearance: Excessive clearance between tappet and its guide hole; Cam profile wear; Excessive clearance between valve stem and its guide; Broken valve spring; Radial fracture of camshaft timing gear; Loose valve seat ring; Valve stuck and unable to close. Excessive clearance between piston and cylinder wall: Piston affected by incorrect depth and width of main bearing oil groove; Poor lubrication due to low oil pressure.

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