Longjia LJ 50 QT-K vs Piaggio Zip

The Piaggio Zip passes its MOT first time more often than the Longjia LJ 50 QT-K: 71.3% vs 57.3%, a 14.0-point lead.

MOT reliability, side by side

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

Metric	Longjia LJ 50 QT-K	Piaggio Zip
First-time pass rate	57.3%	71.3%
Outright fail rate	31.8%	20.4%
Vs comparable bikes (age & mileage adjusted)	-17.0 pts	-1.0 pts
Engine size	49cc	49cc
Rank among all models	#5295 of 5428	#4631 of 5428
Median miles at test	5,822	8,882
MOT tests analysed	1,184	78,993
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	Longjia LJ 50 QT-K	Piaggio Zip
Lights & signalling	20.7%	11.9%
Steering & suspension	16.6%	9.2%
Brakes	12.9%	6.5%
Tyres & wheels	5.2%	4.0%
Fuel & exhaust	4.1%	2.5%
Structure & body	3.0%	1.6%

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	Longjia LJ 50 QT-K	Piaggio Zip
2012	62.7%	69.1%
2013	57.2%	69.7%
2014	48.5%	68.8%
2015	58.0%	69.8%
2016	55.4%	71.0%
2017	56.5%	71.7%
2018	74.4%	72.9%
2019	64.7%	73.0%

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	Longjia LJ 50 QT-K	Piaggio Zip
0k-10k miles	60.7%	75.2%
10k-20k miles	44.2%	66.7%

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

Longjia LJ 50 QT-K vs Piaggio Zip FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Longjia LJ 50 QT-K or the Piaggio Zip?

The Piaggio Zip passes its MOT first time more often than the Longjia LJ 50 QT-K: 71.3% vs 57.3%, a 14.0-point lead. Adjusted for age, mileage and test class, the Piaggio Zip still comes out ahead: -17.0 points vs comparable bikes for the Longjia LJ 50 QT-K, -1.0 for the Piaggio Zip. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Longjia LJ 50 QT-K fail its MOT on most?

Lights & signalling: 20.7% of Longjia LJ 50 QT-K MOT tests failed on it, then steering & suspension (16.6%).

What does the Piaggio Zip fail its MOT on most?

Lights & signalling: 11.9% of Piaggio Zip MOT tests failed on it, then steering & suspension (9.2%).

LONGJIA LJ 50 QT-K 57.3% pass · 1,184 tests PIAGGIO ZIP 71.3% pass · 79.0k tests

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