1991 Yamaha Xtz660 MOT Pass Rate
Pass rate for Xtz660 models manufactured in 1991, based on 154 real MOT test results.
Data from official DVSA MOT testing records
1991 Yamaha Xtz660 MOT Analysis
The 1991 Yamaha Xtz660 has an MOT pass rate of 76.6% based on 154 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 38,355 miles on the odometer. With a 23.4% failure rate, the 1991 Xtz660 is rated as "Excellent" for MOT reliability.
The leading cause of MOT failure for the 1991 Yamaha Xtz660 is Motorcycle brakes, responsible for 4.5% of failures. 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 range from £150–400. Motorcycle structure and attachments is the second most common issue at 2.6%. Motorcycle lamps and reflectors follows at 1.9%.
Top failures specific to 1991 models only. The overall Xtz660 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 Brakes | 4.5% | 7 |
| 2 | Motorcycle Structure And Attachments | 2.6% | 4 |
| 3 | Motorcycle Lamps And Reflectors | 1.9% | 3 |
| 4 | Motorcycle Tyres | 1.9% | 3 |
| 5 | Motorcycle Suspension | 1.9% | 3 |
| 6 | Motorcycle Steering | 1.3% | 2 |
| 7 | Identification Of The Vehicle | 0.6% | 1 |
| 8 | Motorcycle Audible Warning (Horn) | 0.6% | 1 |
| 9 | Motorcycle Wheels | 0.6% | 1 |
| 10 | Non-component Advisories | 0.6% | 1 |
Failures per 10,000 Miles
avg. 38,355 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.
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| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Motorcycle brakes | 1.19 | 4.5% | 7 |
| Motorcycle structure and attachments | 0.68 | 2.6% | 4 |
| Motorcycle lamps and reflectors | 0.51 | 1.9% | 3 |
| Motorcycle tyres | 0.51 | 1.9% | 3 |
| Motorcycle suspension | 0.51 | 1.9% | 3 |
| Motorcycle steering | 0.34 | 1.3% | 2 |
| Identification of the vehicle | 0.17 | 0.6% | 1 |
| Motorcycle audible warning (Horn) | 0.17 | 0.6% | 1 |
| Motorcycle wheels | 0.17 | 0.6% | 1 |
| Non-component advisories | 0.17 | 0.6% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1991 Yamaha Xtz660 has an MOT pass rate of 76.6% based on 154 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 38,355 miles on the odometer. With a 23.4% failure rate, the 1991 Xtz660 is rated as "Excellent" for MOT reliability.
If you own or are considering buying a 1991 Yamaha Xtz660, you can expect reliable MOT performance overall. Before your MOT, pay particular attention to motorcycle brakes: 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). With relatively low average mileage of 38,355 miles, many of these vehicles are still in good mechanical condition.
Motorcycle brakes — 4.5% of failures
Motorcycle brakes issues account for 4.5% of MOT failures on 1991 Yamaha Xtz660 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 structure and attachments — 2.6% of failures
Motorcycle structure and attachments issues account for 2.6% of MOT failures on 1991 Yamaha Xtz660 models. Motorcycle structure and attachments issues are a common cause of MOT failure. Regular inspection and maintenance of these components helps ensure your vehicle passes its MOT. Typical repair costs: £100–400. Pre-MOT check: Have this system checked during regular servicing. Look for warning signs like unusual noises, vibrations, or dashboard warning lights.
Motorcycle lamps and reflectors — 1.9% of failures
Motorcycle lamps and reflectors issues account for 1.9% of MOT failures on 1991 Yamaha Xtz660 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.