YAMAHA CS50

49cc Petrol Class 1

#4887 of 5426 overall #383 of 409 YAMAHAs #281 of 455 moped bikes

67.4%

first-time pass rate

23.8%

failed outright

4,453

median miles at test

5,046

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2005–2025

The CS50's first-time pass rate has risen 5.9 points since 2005, 53.7% to 59.6%.

Pass rate by mileage

how the CS50's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage CS50 passes first time 69.3% of the time; by 20k that's 53.7%.

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 CS50

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
lighting and signalling	1,263	38.2	3.5×
brakes	714	21.6	2.4×
steering and suspension	371	11.2	1.9×
tyres and wheels	275	8.3	2.1×
lamps and reflectors	261	7.9	1.5×
fuel and exhaust	212	6.4	4.9×
body and structure	86	2.6	2.9×
structure and attachments	47	1.4	1.0×
steering	44	1.3	1.7×
tyres	37	1.1	0.9×

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects. "vs all bikes" is how often this model's tests record a defect in the group, as a multiple of the all-bike rate.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the CS50 beats 2 of its 4 closest rivals (PEUGEOT SPEEDFIGHT, PIAGGIO ZIP, PIAGGIO NRG).

PEUGEOT SPEEDFIGHT 65.2% pass · 83.7k tests PIAGGIO ZIP 71.3% pass · 79.0k tests PIAGGIO NRG 65.5% pass · 40.5k tests PEUGEOT VIVACITY 70.4% pass · 29.7k tests

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 CS50.

Pass rate by registration year

how each model-year cohort fares · registration year from first use date

Best year to buy used: 2011 (75.4% pass). Weakest: 2012 (61.9%).

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.

YAMAHA CS50 FAQ

answers computed from the data above · terms in the glossary

Is the YAMAHA CS50 reliable?

The YAMAHA CS50 is less reliable than average for its class: 67.4% of its 5,046 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4887 of 5426 models.

What does a CS50 fail its MOT on most?

lighting and signalling — 38% of all defects recorded against failed CS50 tests.

What is the best year of CS50 to buy used?

By first-time pass rate, 2011-registered examples do best (75.4%) and 2012 worst (61.9%). Condition and history still trump the year.

How many miles will a CS50 last?

The median CS50 shows 4,453 miles at test, and examples around 20k miles still pass 53.7% of the time — mileage alone rarely kills one.