2021 Kawasaki Ninja 400 Problems: 1 Known Issue
2021 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated October 2026
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Preview the XT6 exampleAccording to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2021 Kawasaki Ninja 400 has 1 documented issue, with 1 rated critical. The most serious is Camshaft chain tensioner improperly heat treated - can fail and stall the engine (NHTSA recall 20V-774 / Kawasaki MC20-13) ($0-$0 repair).
All 1 Known Issue
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Frequently Asked Questions
What are the most common Kawasaki Ninja 400 problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2021 Kawasaki Ninja 400 has 1 documented issue. The documented issue is: Camshaft chain tensioner improperly heat treated - can fail and stall the engine (NHTSA recall 20V-774 / Kawasaki MC20-13). Of these, 1 is rated critical and should be addressed promptly.
Is the Kawasaki Ninja 400 reliable?
The 2021 Kawasaki Ninja 400 has 1 known issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: Camshaft chain tensioner improperly heat treated - can fail and stall the engine (NHTSA recall 20V-774 / Kawasaki MC20-13). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Kawasaki Ninja 400 problems?
Repair costs for known Kawasaki Ninja 400 issues range from $0 to $0, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Camshaft chain tensioner improperly heat treated - can fail and stall the engine (NHTSA recall 20V-774 / Kawasaki MC20-13), typically costs $0-$0 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2021 Kawasaki Ninja 400 Camshaft chain tensioner improperly heat treated - can fail and stall the engine (NHTSA recall 20V-774 / Kawasaki MC20-13)?
Recall 20V774 / Kawasaki MC20-13 covers certain 2021 Ninja 400 (EX400H) and Ninja 400 ABS (EX400G), alongside Z400 ABS motorcycles, produced July 1–October 27, 2020. Improper heat treatment left the camshaft-chain tensioner insufficiently strong. Damage can cause abnormal engine… Repairs typically run $0-$0. Severity: high.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public motorcycle data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.