Z Y Motor ZY 50 QT-7 vs Piaggio NRG

The Piaggio NRG passes its MOT first time more often than the Z Y Motor ZY 50 QT-7: 65.5% vs 59.6%, a 5.9-point lead.

MOT reliability, side by side

first-time pass rate, outright fail rate and tests analysed · 2005–2025

Metric	Z Y Motor ZY 50 QT-7	Piaggio NRG
First-time pass rate	59.6%	65.5%
Outright fail rate	31.1%	27.4%
Vs comparable bikes (age & mileage adjusted)	-16.5 pts	-6.0 pts
Engine size	49cc	49cc
Rank among all models	#5227 of 5428	#4992 of 5428
Median miles at test	4,046	9,874
MOT tests analysed	527	40,458
Most common failure	lighting and signalling	lighting and signalling

First-time outcomes on normal tests, 2005–2025. "Most common failure" is the component group with the most recorded defects on failed tests. Read pass rates against test counts: a smaller sample is noisier. Source: DVSA anonymised MOT results.

"Vs comparable bikes" is the first-time pass rate minus the rate expected for each bike's own mix of age, mileage and test class, in percentage points: positive means better than comparable bikes. How this works.

What fails, side by side

share of each bike's MOT tests that failed on the component · lower is better

Component	Z Y Motor ZY 50 QT-7	Piaggio NRG
Lights & signalling	17.6%	15.0%
Steering & suspension	14.2%	15.5%
Brakes	18.6%	10.2%
Tyres & wheels	3.4%	4.7%
Structure & body	2.7%	2.5%
Fuel & exhaust	1.1%	3.8%

A test that fails on two components counts once in each. Component links go to the bikes most likely to fail on it.

Pass rate by test year

first-time MOT pass rate in each calendar year both bikes were tested

Test year	Z Y Motor ZY 50 QT-7	Piaggio NRG
2007	57.9%	63.9%
2008	55.9%	65.2%
2009	64.3%	62.2%
2010	57.5%	63.2%
2011	61.3%	63.9%
2012	42.3%	63.4%
2013	54.3%	64.1%

Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.

Pass rate by mileage

first-time MOT pass rate by miles on the clock at test

Mileage	Z Y Motor ZY 50 QT-7	Piaggio NRG
0k-10k miles	60.3%	71.3%
10k-20k miles	54.7%	60.6%

Bands with fewer than 30 tests for either bike are left out.

Z Y Motor ZY 50 QT-7 vs Piaggio NRG FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Z Y Motor ZY 50 QT-7 or the Piaggio NRG?

The Piaggio NRG passes its MOT first time more often than the Z Y Motor ZY 50 QT-7: 65.5% vs 59.6%, a 5.9-point lead. Adjusted for age, mileage and test class, the Piaggio NRG still comes out ahead: -16.5 points vs comparable bikes for the Z Y Motor ZY 50 QT-7, -6.0 for the Piaggio NRG. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Z Y Motor ZY 50 QT-7 fail its MOT on most?

Brakes: 18.6% of Z Y Motor ZY 50 QT-7 MOT tests failed on it, then lights & signalling (17.6%).

What does the Piaggio NRG fail its MOT on most?

Steering & suspension: 15.5% of Piaggio NRG MOT tests failed on it, then lights & signalling (15.0%).

Z Y MOTOR ZY 50 QT-7 59.6% pass · 527 tests PIAGGIO NRG 65.5% pass · 40.5k tests

See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.