YIYING YY 50 QT-6

49cc Petrol Class 1

55.1%

first-time pass rate

35.7%

failed outright

6,059

median miles at test

185

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2010–2011

The YY 50 QT-6's first-time pass rate has risen 4.9 points since 2010, 47.6% to 52.5%.

What fails on a YY 50 QT-6

failure defects by component group · advisories excluded

Component group	Defects	% of defects
lighting and signalling	66	31.4
steering and suspension	64	30.5
brakes	34	16.2
tyres and wheels	17	8.1
fuel and exhaust	10	4.8
reg plates and vin	7	3.3
body and structure	5	2.4
lamps and reflectors	4	1.9
tyres	2	1
steering	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 YY 50 QT-6 beats 0 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 YY 50 QT-6.

Pass rate by registration year

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

Best year to buy used: 2006 (56.5% pass). Weakest: 2007 (53.6%).

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.