1984 Yamaha Xs400 MOT Pass Rate
Pass rate for Xs400 models manufactured in 1984, based on 31 real MOT test results.
Data from official DVSA MOT testing records
1984 Yamaha Xs400 MOT Analysis
The 1984 Yamaha Xs400 has an MOT pass rate of 64.5% based on 31 tests — around the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 39,414 miles on the odometer. With a 35.5% failure rate, the 1984 Xs400 is rated as "Average" for MOT reliability.
The leading cause of MOT failure for the 1984 Yamaha Xs400 is Motorcycle steering, responsible for 3.2% of failures. Steering failures include excessive play in the steering wheel, leaking power steering fluid, worn track rod ends, and damaged steering rack. These affect vehicle control and are closely related to suspension wear. Typical repair costs range from £150–600. Motorcycle brakes is the second most common issue at 3.2%. Motorcycle lamps and reflectors follows at 3.2%.
Top failures specific to 1984 models only. The overall Xs400 page may show different rankings.
What Fails Most
What Fails on This Car?
Click a category to see specific failure items.
View as table
| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Motorcycle Steering | 3.2% | 1 |
| 2 | Motorcycle Brakes | 3.2% | 1 |
| 3 | Motorcycle Lamps And Reflectors | 3.2% | 1 |
Failures per 10,000 Miles
avg. 39,414 miFor every 10,000 miles driven, this shows what percentage of MOT tests fail for each category. This accounts for how far cars are actually driven, not just raw pass/fail counts.
View as table
| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Motorcycle steering | 0.82 | 3.2% | 1 |
| Motorcycle brakes | 0.82 | 3.2% | 1 |
| Motorcycle lamps and reflectors | 0.82 | 3.2% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1984 Yamaha Xs400 has an MOT pass rate of 64.5% based on 31 tests — around the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 39,414 miles on the odometer. With a 35.5% failure rate, the 1984 Xs400 is rated as "Average" for MOT reliability.
If you own or are considering buying a 1984 Yamaha Xs400, budget for potential repairs before each MOT. Before your MOT, pay particular attention to motorcycle steering: Check for excessive steering wheel play (more than a few inches of free movement). Listen for whining from the power steering pump. Look for fluid leaks under the car near the front wheels. With relatively low average mileage of 39,414 miles, many of these vehicles are still in good mechanical condition.
Motorcycle steering — 3.2% of failures
Motorcycle steering issues account for 3.2% of MOT failures on 1984 Yamaha Xs400 models. Steering failures include excessive play in the steering wheel, leaking power steering fluid, worn track rod ends, and damaged steering rack. These affect vehicle control and are closely related to suspension wear. Typical repair costs: £150–600. Pre-MOT check: Check for excessive steering wheel play (more than a few inches of free movement). Listen for whining from the power steering pump. Look for fluid leaks under the car near the front wheels.
Motorcycle brakes — 3.2% of failures
Motorcycle brakes issues account for 3.2% of MOT failures on 1984 Yamaha Xs400 models. Brake-related failures include worn brake pads, corroded brake discs, leaking brake lines, and faulty brake servos. These are safety-critical components — any brake deficiency will result in an MOT fail. Typical repair costs: £150–400. Pre-MOT check: Listen for squealing or grinding noises. Check brake pedal feel — if it feels spongy or goes to the floor, have the system inspected immediately. Look at brake pad thickness through the wheel spokes (minimum 3mm).
Motorcycle lamps and reflectors — 3.2% of failures
Motorcycle lamps and reflectors issues account for 3.2% of MOT failures on 1984 Yamaha Xs400 models. Lighting failures cover all external lights: headlights, tail lights, brake lights, indicators, fog lights, and reflectors. A single blown bulb will cause an MOT fail. This is one of the most preventable failure categories. Typical repair costs: £5–50. Pre-MOT check: Walk around the car and check every light — headlights (dipped and main beam), side lights, tail lights, brake lights, indicators, hazard lights, reverse light, rear fog light, and number plate lights. Replace any blown bulbs before the test.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.