Ajs 350 vs Yamaha RD350

The Ajs 350 passes its MOT first time more often than the Yamaha RD350: 88.7% vs 86.3%, a 2.4-point lead.

MOT reliability, side by side

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

Metric	Ajs 350	Yamaha RD350
First-time pass rate	88.7%	86.3%
Outright fail rate	4.1%	6.6%
Engine size	350cc	347cc
Rank among all models	#1370 of 5428	#2120 of 5428
Median miles at test	12,350	23,256
MOT tests analysed	486	19,574
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.

Pass rate by test year

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

Test year	Ajs 350	Yamaha RD350
2006	90.8%	79.9%
2007	85.5%	81.2%
2008	88.5%	79.7%
2009	90.0%	80.6%
2010	88.2%	81.9%
2011	85.1%	82.2%
2012	86.0%	84.7%

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 350	Yamaha RD350
0k-10k miles	90.7%	88.9%
10k-20k miles	93.3%	87.5%
20k-30k miles	86.9%	85.5%
30k-40k miles	81.8%	85.3%

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

AJS 350 88.7% pass · 486 tests YAMAHA RD350 86.3% pass · 19.6k tests

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