YAMAHA WHY (YH50)

49cc Petrol Class 1

#4810 of 5426 overall #376 of 409 YAMAHAs #261 of 455 moped bikes

68.7%

first-time pass rate

17.4%

failed outright

5,964

median miles at test

386

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2006–2010

The WHY (YH50)'s first-time pass rate has risen 1.4 points since 2006, 68.6% to 70.0%.

What fails on a WHY (YH50)

failure defects by component group · advisories excluded

Component group	Defects	% of defects
lighting and signalling	66	32.4
steering and suspension	58	28.4
brakes	36	17.6
tyres and wheels	12	5.9
fuel and exhaust	12	5.9
suspension	7	3.4
body and structure	6	2.9
lamps and reflectors	3	1.5
reg plates and vin	3	1.5
tyres	1	0.5

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the WHY (YH50) 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 WHY (YH50).

Pass rate by registration year

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

Best year to buy used: 2000 (83.1% pass). Weakest: 1999 (63.0%).

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.