SYM AD05W Jet 4 50 vs Piaggio NRG

The SYM AD05W Jet 4 50 passes its MOT first time more often than the Piaggio NRG: 71.2% vs 65.5%, a 5.7-point lead.

MOT reliability, side by side

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

Metric	SYM AD05W Jet 4 50	Piaggio NRG
First-time pass rate	71.2%	65.5%
Outright fail rate	21.7%	27.4%
Vs comparable bikes (age & mileage adjusted)	-0.5 pts	-6.0 pts
Engine size	49cc	49cc
Rank among all models	#4640 of 5428	#4992 of 5428
Median miles at test	10,168	9,874
MOT tests analysed	819	40,458
Most common failure	brakes	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	SYM AD05W Jet 4 50	Piaggio NRG
Steering & suspension	9.0%	15.5%
Lights & signalling	9.2%	15.0%
Brakes	8.9%	10.2%
Tyres & wheels	4.2%	4.7%
Structure & body	3.3%	2.5%
Fuel & exhaust	1.0%	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	SYM AD05W Jet 4 50	Piaggio NRG
2016	66.3%	68.0%
2017	77.9%	72.0%
2018	67.9%	69.2%
2019	63.9%	68.0%
2020	76.1%	71.8%
2021	75.5%	72.9%
2022	60.5%	74.8%
2023	65.7%	77.5%

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	SYM AD05W Jet 4 50	Piaggio NRG
0k-10k miles	74.3%	71.3%
10k-20k miles	67.1%	60.6%
20k-30k miles	72.6%	55.7%

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

SYM AD05W Jet 4 50 vs Piaggio NRG FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the SYM AD05W Jet 4 50 or the Piaggio NRG?

The SYM AD05W Jet 4 50 passes its MOT first time more often than the Piaggio NRG: 71.2% vs 65.5%, a 5.7-point lead. Adjusted for age, mileage and test class, the SYM AD05W Jet 4 50 still comes out ahead: -0.5 points vs comparable bikes for the SYM AD05W Jet 4 50, -6.0 for the Piaggio NRG. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the SYM AD05W Jet 4 50 fail its MOT on most?

Lights & signalling: 9.2% of SYM AD05W Jet 4 50 MOT tests failed on it, then steering & suspension (9.0%).

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%).

Which holds up better at high mileage, the SYM AD05W Jet 4 50 or the Piaggio NRG?

At 20k-30k miles the SYM AD05W Jet 4 50 passes first time more often: 72.6% for the SYM AD05W Jet 4 50 vs 55.7% for the Piaggio NRG.

SYM AD05W JET 4 50 71.2% pass · 819 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.