1991 Harley Davidson Fatboy MOT Pass Rate
Pass rate for Fatboy models manufactured in 1991, based on 49 real MOT test results.
Data from official DVSA MOT testing records
1991 Harley Davidson Fatboy MOT Analysis
The 1991 Harley Davidson Fatboy has an MOT pass rate of 85.7% based on 49 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 17,609 miles on the odometer. With a 14.3% failure rate, the 1991 Fatboy is rated as "Excellent" for MOT reliability.
The leading cause of MOT failure for the 1991 Harley Davidson Fatboy is Motorcycle lamps and reflectors, responsible for 6.1% of failures. 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 range from £5–50. Motorcycle tyres is the second most common issue at 2.0%. Identification of the vehicle follows at 2.0%.
Top failures specific to 1991 models only. The overall Fatboy page may show different rankings.
What Fails Most
What Fails on This Car?
Click a category to see specific failure items.
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| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Motorcycle Lamps And Reflectors | 6.1% | 3 |
| 2 | Motorcycle Tyres | 2.0% | 1 |
| 3 | Identification Of The Vehicle | 2.0% | 1 |
| 4 | Motorcycle Structure And Attachments | 2.0% | 1 |
Failures per 10,000 Miles
avg. 17,609 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 lamps and reflectors | 3.48 | 6.1% | 3 |
| Motorcycle tyres | 1.16 | 2.0% | 1 |
| Identification of the vehicle | 1.16 | 2.0% | 1 |
| Motorcycle structure and attachments | 1.16 | 2.0% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1991 Harley Davidson Fatboy has an MOT pass rate of 85.7% based on 49 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 17,609 miles on the odometer. With a 14.3% failure rate, the 1991 Fatboy is rated as "Excellent" for MOT reliability.
If you own or are considering buying a 1991 Harley Davidson Fatboy, you can expect reliable MOT performance overall. Before your MOT, pay particular attention to motorcycle lamps and reflectors: 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. With relatively low average mileage of 17,609 miles, many of these vehicles are still in good mechanical condition.
Motorcycle lamps and reflectors — 6.1% of failures
Motorcycle lamps and reflectors issues account for 6.1% of MOT failures on 1991 Harley Davidson Fatboy 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.
Motorcycle tyres — 2.0% of failures
Motorcycle tyres issues account for 2.0% of MOT failures on 1991 Harley Davidson Fatboy models. Tyre failures include tread depth below the legal minimum of 1.6mm, cuts, bulges, exposed cords, and incorrect tyre pressure. Tyres are one of the most common and easiest-to-prevent MOT failures. Typical repair costs: £50–200 per tyre. Pre-MOT check: Check tread depth with a 20p coin — if the outer band is visible, the tyre is too worn. Look for bulges, cuts, or embedded objects. Ensure all tyres match the recommended size and load rating.
Identification of the vehicle — 2.0% of failures
Identification of the vehicle issues account for 2.0% of MOT failures on 1991 Harley Davidson Fatboy models. Identification failures relate to the Vehicle Identification Number (VIN) and registration plate. The VIN must be permanently displayed and legible, and the registration plate must meet British Standard formatting. Typical repair costs: £10–50. Pre-MOT check: Ensure the VIN plate is visible and legible (usually in the windscreen or under the bonnet). Check that number plates are clean, undamaged, and use the correct font and spacing.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.