BIKERELIABILITY
MOT DATA · GREAT BRITAIN · 2005–2025
League table/ SKYJET/SJ 125-23
Model report · 2005–2025

SKYJET SJ 125-23

125cc Petrol Class 1
#5424 of 5426 overall #2 of 2 SKYJETs #732 of 734 commuter bikes
44.7%
first-time pass rate
44.7%
failed outright
6,182
median miles at test
2,319
MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2009–2021

The SJ 125-23's first-time pass rate has risen 8.5 points since 2009, 40.0% to 48.5%.

33%49%64%2009: 40.0% pass (45 tests)2010: 41.3% pass (172 tests)2011: 40.1% pass (267 tests)2012: 38.4% pass (292 tests)2013: 44.5% pass (292 tests)2014: 45.1% pass (315 tests)2015: 47.1% pass (306 tests)2016: 51.0% pass (257 tests)2017: 47.2% pass (144 tests)2018: 53.4% pass (58 tests)2019: 59.0% pass (39 tests)2020: 43.6% pass (39 tests)2021: 48.5% pass (33 tests)20092021

Pass rate by mileage

how the SJ 125-23's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage SJ 125-23 passes first time 46.4% of the time; by 20k that's 33.3%.

31%40%49%0k: 46.4% pass (1,701 tests)10k: 40.3% pass (501 tests)20k: 33.3% pass (54 tests)0k10k20k

First-time pass rate by odometer reading at test, 10,000-mile bands for this model. Mileage is the strongest reliability signal. See the full curve.

What fails on a SJ 125-23

failure defects by component group · advisories excluded
Component group Share of defects Defects % of defects vs all bikes
lighting and signalling
1,519 35.1 7.3×
steering and suspension
835 19.3 7.6×
brakes
643 14.9 4.3×
tyres and wheels
327 7.6 5.2×
body and structure
315 7.3 20.6×
drive system
307 7.1 13.4×
fuel and exhaust
118 2.7 5.4×
lamps and reflectors
104 2.4 1.5×
structure and attachments
79 1.8 2.7×
reg plates and vin
76 1.8 5.2×

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects. "vs all bikes" is how often this model's tests record a defect in the group, as a multiple of the all-bike rate.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the SJ 125-23 beats 0 of its 4 closest rivals (YAMAHA YBR 125, HONDA CG125, HONDA CBF125).

YAMAHA YBR 125 71.0% pass · 125k tests HONDA CG125 72.2% pass · 89.3k tests HONDA CBF125 73.3% pass · 84.4k tests GILERA RUNNER 70.8% pass · 69.9k 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 SJ 125-23.

Pass rate by registration year

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

Best year to buy used: 2011 (51.8% pass). Weakest: 2012 (39.5%).

37%46%54%2006: 42.4% pass (283 tests)2007: 41.7% pass (549 tests)2008: 43.8% pass (425 tests)2009: 47.2% pass (231 tests)2010: 47.0% pass (215 tests)2011: 51.8% pass (301 tests)2012: 39.5% pass (200 tests)2013: 46.6% pass (103 tests)200620102013

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.

SKYJET SJ 125-23 FAQ

answers computed from the data above · terms in the glossary

Is the SKYJET SJ 125-23 reliable?

The SKYJET SJ 125-23 is less reliable than average for its class: 44.7% of its 2,319 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #5424 of 5426 models.

What does a SJ 125-23 fail its MOT on most?

lighting and signalling — 35% of all defects recorded against failed SJ 125-23 tests.

What is the best year of SJ 125-23 to buy used?

By first-time pass rate, 2011-registered examples do best (51.8%) and 2012 worst (39.5%). Condition and history still trump the year.

How many miles will a SJ 125-23 last?

The median SJ 125-23 shows 6,182 miles at test, and examples around 20k miles still pass 33.3% of the time — mileage alone rarely kills one.