Pass rate by mileage
A low-mileage CM passes first time 73.7% of the time; by 40k that's 80.0%.
First-time pass rate by odometer reading at test, 10,000-mile bands for this model. Mileage is the strongest reliability signal. See the full curve.
What fails on a CM
| Component group | Share of defects | Defects | % of defects |
|---|---|---|---|
| lighting and signalling |
|
20 | 26 |
| steering and suspension |
|
17 | 22.1 |
| brakes |
|
11 | 14.3 |
| tyres and wheels |
|
10 | 13 |
| drive system |
|
8 | 10.4 |
| fuel and exhaust |
|
4 | 5.2 |
| reg plates and vin |
|
4 | 5.2 |
| Items Not Tested |
|
1 | 1.3 |
| body and structure |
|
1 | 1.3 |
| structure and attachments |
|
1 | 1.3 |
Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects.
How rivals compare
On first-time pass rate the CM beats 0 of its 4 closest rivals (YAMAHA YP250, YAMAHA WR250F, HONDA XR250).
Rivals share this bike's type and sit within ±30% of its engine capacity, ≥ 5,000 tests. Card colour = better/worse first-time pass rate than the CM.
Pass rate by registration year
Best year to buy used: 1982 (82.2% pass). Weakest: 1981 (76.5%).
First-time pass rate by the year each bike was first registered (cohorts with ≥ 50 tests). Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.