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Triumph Unknown vs Triumph Wl350: reliability comparison

MOT pass rates, common faults and mileage compared from real UK MOT data.

Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Triumph Wl350
64%
MOT pass rate · 2 vehicles
Verdict: On MOT pass rate the Triumph Unknown (89%) and Triumph Wl350 (64%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Triumph Unknown Triumph Wl350
MOT pass rate 89% ✓ 64%
MOT failure rate 11% ✓ 36%
Faults & advisories per test 0.6 0.0 ✓
Dangerous-fault share 2% — ✓
Average mileage 16,601 mi —
Sample size (vehicles) 65,927 2

Most common faults

Triumph Unknown

  1. Exhaust noisy (8.1.1 (a))
  2. Exhaust noisy (7.1.2)
  3. Front Roller brake test indicates slight fluctuation of brake effort (3.3.A1d)
  4. COVID-19 6 MONTH EXTENSION
  5. Rear Tyre worn close to the legal limit (5.2.3 (e))
  6. Steering headbearing has slight free play (2.2.2)

Triumph Wl350

  1. Floor brake test indicates a binding brake (3.3.C2c)
  2. Offside Front Footrest insecure (6.2.1a)
  3. Fuel cap sealing washer torn (7.2.2c)
  4. Riders seat insecure (6.2.1a)
  5. Rear position lamp does not illuminate immediately when it is switched on (1.1.3a)
  6. Drive chain excessively loose (6.2.1d)

Reliability FAQ

On MOT pass rate the Triumph Unknown (89%) and Triumph Wl350 (64%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph Unknown report Full Triumph Wl350 report Most reliable cars

Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.