Ajs JS 125-E vs Gilera Runner

The Gilera Runner passes its MOT first time more often than the Ajs JS 125-E: 70.8% vs 63.2%, a 7.6-point lead.

MOT reliability, side by side

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

Metric	Ajs JS 125-E	Gilera Runner
First-time pass rate	63.2%	70.8%
Outright fail rate	24.6%	21.5%
Vs comparable bikes (age & mileage adjusted)	-8.0 pts	-0.7 pts
Engine size	124cc	124cc
Rank among all models	#5099 of 5428	#4675 of 5428
Median miles at test	12,612	11,381
MOT tests analysed	699	69,850
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	Ajs JS 125-E	Gilera Runner
Lights & signalling	14.2%	12.3%
Steering & suspension	8.4%	10.6%
Brakes	8.9%	7.2%
Tyres & wheels	6.3%	5.1%
Drive system	8.0%	0.0%
Structure & body	3.7%	2.0%
Fuel & exhaust	0.7%	2.6%

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	Ajs JS 125-E	Gilera Runner
2011	55.6%	67.6%
2012	64.2%	69.5%
2013	60.0%	69.5%
2014	67.0%	70.6%
2015	59.7%	72.1%
2016	68.6%	73.3%
2017	63.5%	76.1%

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	Ajs JS 125-E	Gilera Runner
0k-10k miles	71.4%	76.2%
10k-20k miles	50.9%	67.5%
20k-30k miles	62.9%	65.4%
30k-40k miles	70.5%	67.2%

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

Ajs JS 125-E vs Gilera Runner FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Ajs JS 125-E or the Gilera Runner?

The Gilera Runner passes its MOT first time more often than the Ajs JS 125-E: 70.8% vs 63.2%, a 7.6-point lead. Adjusted for age, mileage and test class, the Gilera Runner still comes out ahead: -8.0 points vs comparable bikes for the Ajs JS 125-E, -0.7 for the Gilera Runner. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Ajs JS 125-E fail its MOT on most?

Lights & signalling: 14.2% of Ajs JS 125-E MOT tests failed on it, then brakes (8.9%).

What does the Gilera Runner fail its MOT on most?

Lights & signalling: 12.3% of Gilera Runner MOT tests failed on it, then steering & suspension (10.6%).

Which holds up better at high mileage, the Ajs JS 125-E or the Gilera Runner?

At 30k-40k miles the Ajs JS 125-E passes first time more often: 70.5% for the Ajs JS 125-E vs 67.2% for the Gilera Runner.

AJS JS 125-E 63.2% pass · 699 tests GILERA RUNNER 70.8% pass · 69.9k tests

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