1991 Harley-davidson Sporster MOT Pass Rate
Pass rate for Sporster models manufactured in 1991, based on 40 real MOT test results.
Data from official DVSA MOT testing records
1991 Harley-davidson Sporster MOT Analysis
The 1991 Harley-davidson Sporster has an MOT pass rate of 87.5% based on 40 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 26,040 miles on the odometer. With a 12.5% failure rate, the 1991 Sporster is rated as "Excellent" for MOT reliability.
The leading cause of MOT failure for the 1991 Harley-davidson Sporster is Motorcycle tyres and wheels, responsible for 2.5% of failures. 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 range from £50–200 per tyre. Motorcycle lighting and signalling is the second most common issue at 2.5%.
Top failures specific to 1991 models only. The overall Sporster 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 Tyres And Wheels | 2.5% | 1 |
| 2 | Motorcycle Lighting And Signalling | 2.5% | 1 |
Failures per 10,000 Miles
avg. 26,040 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 tyres and wheels | 0.96 | 2.5% | 1 |
| Motorcycle lighting and signalling | 0.96 | 2.5% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1991 Harley-davidson Sporster has an MOT pass rate of 87.5% based on 40 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 26,040 miles on the odometer. With a 12.5% failure rate, the 1991 Sporster is rated as "Excellent" for MOT reliability.
If you own or are considering buying a 1991 Harley-davidson Sporster, you can expect reliable MOT performance overall. Before your MOT, pay particular attention to motorcycle tyres and wheels: 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. With relatively low average mileage of 26,040 miles, many of these vehicles are still in good mechanical condition.
Motorcycle tyres and wheels — 2.5% of failures
Motorcycle tyres and wheels issues account for 2.5% of MOT failures on 1991 Harley-davidson Sporster 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.
Motorcycle lighting and signalling — 2.5% of failures
Motorcycle lighting and signalling issues account for 2.5% of MOT failures on 1991 Harley-davidson Sporster models. Motorcycle lighting and signalling 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.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.