MOT History from tests of petrol YAMAHA YN50s year 1999

Review the list of common YAMAHA YN50 failures below or to perform a specific mot history check on your YAMAHA then use our popular KnowYourCar service

mot history

Pass percent:68.56%

(The average a petrol YAMAHA YN50 year 1999 passes without issue)

Based on:1,708 MOT Tests

Most common failures	No# failures
Headlamp aim out of alignment	83
Front Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	66
Rear shock absorber has inadequate damping effect. \|2.4.A.3b\|	45
Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	40
Exhaust is leaking and excessively noisey \|7.1.1b\|	40
Steering headbearing has excessive free play \|2.2.2\|	38
Rear Brake lever has inadequate reserve travel \|3.1.3b\|	33
Rear reflector on motorcycle missing \|1.4.1\|	28
Registration plate issues	25
Headlamp at least one does not illuminate on dipped beam \|1.2.2a\|i\|\|	20
Horn not working \|1.7.3a\|	18
Rear position lamp does not illuminate immediately when it is switched on \|1.1.3a\|	18
Headlamp insecure \|1.2.3b\|	16
Rear Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	16
Roller brake test The less effective brake control does not achieve an efficiency of 25%. \|3.3.A2b\|	14
Rear Rear shock absorber has inadequate damping effect. \|2.4.A.3b\|	14
Riders seat insecure \|6.2.1a\|	13
Horn not loud enough to be heard by another road user \|1.7.3a\|	13
Nearside Front Direction indicator not working \|1.5.1c\|	10
Headlamp at least one does not illuminate on main beam \|1.2.2a\|ii\|\|	10
Front wheel bearings are excessively rough \|2.3.5b\|	10
Nearside Rear Direction indicator not working \|1.5.1c\|	9
Throttle operating incorrectly \|6.2.1f\|	9
Front Headlamp at least one does not illuminate on dipped beam \|1.2.2a\|i\|\|	9
Steering movement excessively `notchy` with the wheel raised \|2.2.1b\|	9
Rear reflector on motorcycle obscured \|1.4.1\|	8
Offside Front shock absorber seal failed and leaking oil \|2.3.3\|	8
Exhaust excessively deteriorated \|7.1.1a\|	7
Front Roller brake test indicates excessive fluctuation of brake effort \|3.3.A1d\|	7
Rear Rear position lamp does not illuminate immediately when it is switched on \|1.1.3a\|	7
Direction indicators flashing more than 120 times per minute \|1.5.1c\|	7
Front wheel bearings have excessive free play \|2.3.5b\|	7
Rear shock absorber seal failed and leaking oil \|2.4.A.1c\|	7
Rear wheel insecure \|4.2.3b\|	7
Front position lamp does not illuminate immediately when switched on \|1.1.3a\|	7
Nearside Front shock absorber seal failed and leaking oil \|2.3.3\|	7
Offside Front Direction indicator not working \|1.5.1c\|	6
Exhaust mounting does not fully support the exhaust system \|7.1.1.c\|	6
Front Front shock absorber seal failed and leaking oil \|2.3.3\|	6
Fuel system component leaking \|7.2.1a\|	6
Rear wheel bearings have excessive free play \|2.4.A.2c\|	6
Nearside Front Direction indicators not working \|1.5.1c\|	6
Front Fairings insecure and likely to impede the steering \|2.1.2e\|	6
Nearside Rear Direction indicators not working \|1.5.1c\|	6
Offside Rear Direction indicator not working \|1.5.1c\|	5
Rear Rear reflector on motorcycle obscured \|1.4.1\|	5
Wheel alignment incorrect which adversely affects the handling \|2.5.1\|	5
Front Front wheel bearings have excessive free play \|2.3.5b\|	5
Front Exhaust is leaking and excessively noisey \|7.1.1b\|	5
Rear Rear reflector on motorcycle missing \|1.4.1\|	5
Front Headlamp at least one does not illuminate on main beam \|1.2.2a\|ii\|\|	5
Front shock absorber seal failed and leaking oil \|2.3.3\|	5
Steering movement excessively `notchy` with the weight on the lower bearing \|2.2.1a\|	5
Direction indicators not working \|1.5.1c\|	4
Handlebar deformed \|2.1.1b\|	4
Nearside Front Front shock absorber seal failed and leaking oil \|2.3.3\|	4
Front Headlamp insecure \|1.2.3b\|	4
Rear Position lamp not working \|4.2.1 \|a\|\|	4
Stop lamp affected by the operation of another lamp \|1.3.2\|	4
Fuel cap sealing washer missing \|7.2.2c\|	4
Front Roller brake test indicates a binding brake \|3.3.A1a\|	4
Wheel alignment incorrect which adversely affects the steering \|2.5.1\|	4
Rear wheel has a loose wheel nut\|s\| \|4.2.3a\|	4
Nearside Direction indicators flashing more than 120 times per minute \|1.5.1c\|	3
Exhaust noise is clearly in excess of that emitted by a similar motor bicycle fitted with a standard silencer in average condition \|7.1.2\|	3
Offside Front Front shock absorber seal failed and leaking oil \|2.3.3\|	3
Brake lever has inadequate reserve travel \|3.1.3b\|	3
Headlamp dipped beam affected by the operation of another lamp \|1.2.2c\|	3
Rear Rear shock absorber seal failed and leaking oil \|2.4.A.1c\|	3
Front Floor brake test indicates a binding brake \|3.3.C2c\|	3
Rear Exhaust is leaking and excessively noisey \|7.1.1b\|	3
Direction indicator affected by the operation of another lamp \|1.5.1c\|	3
Front Brake disc\|s\| excessively worn \|3.2.A1l\|	3
Front Front position lamp does not illuminate immediately when switched on \|1.1.3a\|	3
Stop lamp affected by the operation of the horn \|1.3.2\|	3
Front Brake disc\|s\| friction surface contaminated by oil or grease \|3.2.A1k\|	3
Rear Rear position lamp insecure \|1.1.1c\|	3
Stop lamp remains on when the brake is released \|1.3.1e\|	3
Front suspension assembly component excessively bent \|2.3.1\|	3
Front Steering movement excessively `notchy` with the wheel raised \|2.2.1b\|	3
Offside Front Direction indicators not working \|1.5.1c\|	3
Front Steering headbearing has excessive free play \|2.2.2\|	3
Front Stop lamp remains on when the brake is released \|1.3.1e\|	3
An item not tested \|Manual\|	3
Front Stop lamp does not emit a steady light \|1.3.1b\|	3
Direction indicators affected by the operation of another lamp \|1.5.1c\|	3
Front Valve stem seriously damaged \|5.2.3 \|j\|\|	3
Rear Stop lamp not working (4.3.1 (a) (ii))	3
Rear reflector missing (4.8.2 (a) (ii))	3
Rear Position lamp not working (4.2.1 (a))	3
Rear Brake lever has insufficient reserve travel (1.1.2 (a))	3
Registration plate lamp issues	3
Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b))	3
Headlamp aim beam image kick up to the offside \|1.6\|	2
Front position lamp insecure \|1.1.1c\|	2
Offside Direction indicator not working \|1.5.1c\|	2
Nearside Direction indicators not working \|1.5.1c\|	2
Steering control handlebar movement restricted by taut cables \|2.1.2c\|	2
Rear wheel bearings are excessively rough \|2.4.A.2c\|	2
Roller brake test No brake control achieves an efficiency of 30%. \|3.3.A2a\|	2
Rear suspension bush has excessive free play \|2.4.A2a\|i\|\|	2
Rear Rear wheel spindle securing nut\|s\| loose \|2.4.A.2b\|	2
Brake performance not tested \|3.3\|	2
Offside Rear Direction indicators not working \|1.5.1c\|	2
Front Brake disc\|s\| excessively scored \|3.2.A1l\|	2
Front Leg shield insecure and likely to impede the steering \|2.1.2e\|	2
Nearside Brake lever has inadequate reserve travel \|3.1.3b\|	2
Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking \|6.1.1c\|	2
Lower Steering headbearing has excessive free play \|2.2.2\|	2
Nearside Rear Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	2
Direction indicators flashing less than 60 times a minute \|1.5.1c\|	2
Rear Shock absorber has negligible damping effect \|5.3.2 \|b\|\|	2
Nearside Front Brake lever has inadequate reserve travel \|3.1.3b\|	2
Rear Exhaust noise is clearly in excess of that emitted by a similar motor bicycle fitted with a standard silencer in average condition \|7.1.2\|	2
Headlamp aim headlamp deteriorated and function impaired \|1.2.3a\|	2
Front Fork yoke deformed \|2.1.1b\|	2
Horn sounds harsh or grating \|1.7.3c\|	2
Rear Roller brake test indicates a sticking brake \|3.3.A1a\|	2
Front Brake component worn and seriously reduced in strength \|3.2.A1\|	2
Front Horn not working \|1.7.3a\|	2
Nearside Front Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	2
Handlebar mounting clamp bolt loose \|2.1.1a\|	2
Rear position lamp insecure \|1.1.1c\|	2
Rear position lamp adversely affected by the operation of another lamp \|1.1.3b\|	2
Headlamp insecure \|4.1.1 \|c\|\|	2
Headlamp not working on dipped beam \|4.1.1 \|a\| \|ii\|\|	2
Headlamp not working on main beam \|4.1.1 \|a\| \|ii\|\|	2
Rear Rear reflector on motorcycle obscured \|1.4.2b\|	2
Fairings insecure and likely to impede the steering \|2.1.2e\|	2
Rear Brake lever is inoperative \|3.1.3c\|	2
Rear Rear wheel has a loose wheel nut\|s\| \|4.2.3a\|	2
Rear Valve stem seriously damaged \|5.2.3 \|j\|\|	2
Front Upper Steering headbearing has excessive free play \|2.2.2\|	2
Front Direction indicators not working \|1.5.1c\|	2
Front Stop lamp not working (4.3.1 (a) (ii))	2
Front Headlamp not working on dipped beam (4.1.1 (a) (ii))	2
Horn not working (7.7 (a) (ii))	2
All direction indicators not working (4.4.1 (a) (ii))	2

We get to these numbers by trawling through over 1 billion MOT test results since 2004 and crunched the numbers. We remove anything to do with Tyres, as they are model independent and group together common non-model specific issues. We are trying to get to a picture of what models have what issues.

Please note: We take the data from the DVSA. This data is raw and can contain typos and spelling mistakes that garages may have entered while recording a MOT result. Specifically miss-match on names of models and makes. We are constantly cleaning the data so bear with the odd issue.

Got suggestions? We’re improving this section all the time. If you have any suggestions, please let us know.

Most common failures	No# failures
Headlamp aim out of alignment	83
Front Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	66
Rear shock absorber has inadequate damping effect. \|2.4.A.3b\|	45
Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	40
Exhaust is leaking and excessively noisey \|7.1.1b\|	40
Steering headbearing has excessive free play \|2.2.2\|	38
Rear Brake lever has inadequate reserve travel \|3.1.3b\|	33
Rear reflector on motorcycle missing \|1.4.1\|	28
Registration plate issues	25
Headlamp at least one does not illuminate on dipped beam \|1.2.2a\|i\|\|	20
Horn not working \|1.7.3a\|	18
Rear position lamp does not illuminate immediately when it is switched on \|1.1.3a\|	18
Headlamp insecure \|1.2.3b\|	16
Rear Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	16
Roller brake test The less effective brake control does not achieve an efficiency of 25%. \|3.3.A2b\|	14
Rear Rear shock absorber has inadequate damping effect. \|2.4.A.3b\|	14
Riders seat insecure \|6.2.1a\|	13
Horn not loud enough to be heard by another road user \|1.7.3a\|	13
Nearside Front Direction indicator not working \|1.5.1c\|	10
Headlamp at least one does not illuminate on main beam \|1.2.2a\|ii\|\|	10
Front wheel bearings are excessively rough \|2.3.5b\|	10
Nearside Rear Direction indicator not working \|1.5.1c\|	9
Throttle operating incorrectly \|6.2.1f\|	9
Front Headlamp at least one does not illuminate on dipped beam \|1.2.2a\|i\|\|	9
Steering movement excessively `notchy` with the wheel raised \|2.2.1b\|	9
Rear reflector on motorcycle obscured \|1.4.1\|	8
Offside Front shock absorber seal failed and leaking oil \|2.3.3\|	8
Exhaust excessively deteriorated \|7.1.1a\|	7
Front Roller brake test indicates excessive fluctuation of brake effort \|3.3.A1d\|	7
Rear Rear position lamp does not illuminate immediately when it is switched on \|1.1.3a\|	7
Direction indicators flashing more than 120 times per minute \|1.5.1c\|	7
Front wheel bearings have excessive free play \|2.3.5b\|	7
Rear shock absorber seal failed and leaking oil \|2.4.A.1c\|	7
Rear wheel insecure \|4.2.3b\|	7
Front position lamp does not illuminate immediately when switched on \|1.1.3a\|	7
Nearside Front shock absorber seal failed and leaking oil \|2.3.3\|	7
Offside Front Direction indicator not working \|1.5.1c\|	6
Exhaust mounting does not fully support the exhaust system \|7.1.1.c\|	6
Front Front shock absorber seal failed and leaking oil \|2.3.3\|	6
Fuel system component leaking \|7.2.1a\|	6
Rear wheel bearings have excessive free play \|2.4.A.2c\|	6
Nearside Front Direction indicators not working \|1.5.1c\|	6
Front Fairings insecure and likely to impede the steering \|2.1.2e\|	6
Nearside Rear Direction indicators not working \|1.5.1c\|	6
Offside Rear Direction indicator not working \|1.5.1c\|	5
Rear Rear reflector on motorcycle obscured \|1.4.1\|	5
Wheel alignment incorrect which adversely affects the handling \|2.5.1\|	5
Front Front wheel bearings have excessive free play \|2.3.5b\|	5
Front Exhaust is leaking and excessively noisey \|7.1.1b\|	5
Rear Rear reflector on motorcycle missing \|1.4.1\|	5
Front Headlamp at least one does not illuminate on main beam \|1.2.2a\|ii\|\|	5
Front shock absorber seal failed and leaking oil \|2.3.3\|	5
Steering movement excessively `notchy` with the weight on the lower bearing \|2.2.1a\|	5
Direction indicators not working \|1.5.1c\|	4
Handlebar deformed \|2.1.1b\|	4
Nearside Front Front shock absorber seal failed and leaking oil \|2.3.3\|	4
Front Headlamp insecure \|1.2.3b\|	4
Rear Position lamp not working \|4.2.1 \|a\|\|	4
Stop lamp affected by the operation of another lamp \|1.3.2\|	4
Fuel cap sealing washer missing \|7.2.2c\|	4
Front Roller brake test indicates a binding brake \|3.3.A1a\|	4
Wheel alignment incorrect which adversely affects the steering \|2.5.1\|	4
Rear wheel has a loose wheel nut\|s\| \|4.2.3a\|	4
Nearside Direction indicators flashing more than 120 times per minute \|1.5.1c\|	3
Exhaust noise is clearly in excess of that emitted by a similar motor bicycle fitted with a standard silencer in average condition \|7.1.2\|	3
Offside Front Front shock absorber seal failed and leaking oil \|2.3.3\|	3
Brake lever has inadequate reserve travel \|3.1.3b\|	3
Headlamp dipped beam affected by the operation of another lamp \|1.2.2c\|	3
Rear Rear shock absorber seal failed and leaking oil \|2.4.A.1c\|	3
Front Floor brake test indicates a binding brake \|3.3.C2c\|	3
Rear Exhaust is leaking and excessively noisey \|7.1.1b\|	3
Direction indicator affected by the operation of another lamp \|1.5.1c\|	3
Front Brake disc\|s\| excessively worn \|3.2.A1l\|	3
Front Front position lamp does not illuminate immediately when switched on \|1.1.3a\|	3
Stop lamp affected by the operation of the horn \|1.3.2\|	3
Front Brake disc\|s\| friction surface contaminated by oil or grease \|3.2.A1k\|	3
Rear Rear position lamp insecure \|1.1.1c\|	3
Stop lamp remains on when the brake is released \|1.3.1e\|	3
Front suspension assembly component excessively bent \|2.3.1\|	3
Front Steering movement excessively `notchy` with the wheel raised \|2.2.1b\|	3
Offside Front Direction indicators not working \|1.5.1c\|	3
Front Steering headbearing has excessive free play \|2.2.2\|	3
Front Stop lamp remains on when the brake is released \|1.3.1e\|	3
An item not tested \|Manual\|	3
Front Stop lamp does not emit a steady light \|1.3.1b\|	3
Direction indicators affected by the operation of another lamp \|1.5.1c\|	3
Front Valve stem seriously damaged \|5.2.3 \|j\|\|	3
Rear Stop lamp not working (4.3.1 (a) (ii))	3
Rear reflector missing (4.8.2 (a) (ii))	3
Rear Position lamp not working (4.2.1 (a))	3
Rear Brake lever has insufficient reserve travel (1.1.2 (a))	3
Registration plate lamp issues	3
Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b))	3
Headlamp aim beam image kick up to the offside \|1.6\|	2
Front position lamp insecure \|1.1.1c\|	2
Offside Direction indicator not working \|1.5.1c\|	2
Nearside Direction indicators not working \|1.5.1c\|	2
Steering control handlebar movement restricted by taut cables \|2.1.2c\|	2
Rear wheel bearings are excessively rough \|2.4.A.2c\|	2
Roller brake test No brake control achieves an efficiency of 30%. \|3.3.A2a\|	2
Rear suspension bush has excessive free play \|2.4.A2a\|i\|\|	2
Rear Rear wheel spindle securing nut\|s\| loose \|2.4.A.2b\|	2
Brake performance not tested \|3.3\|	2
Offside Rear Direction indicators not working \|1.5.1c\|	2
Front Brake disc\|s\| excessively scored \|3.2.A1l\|	2
Front Leg shield insecure and likely to impede the steering \|2.1.2e\|	2
Nearside Brake lever has inadequate reserve travel \|3.1.3b\|	2
Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking \|6.1.1c\|	2
Lower Steering headbearing has excessive free play \|2.2.2\|	2
Nearside Rear Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	2
Direction indicators flashing less than 60 times a minute \|1.5.1c\|	2
Rear Shock absorber has negligible damping effect \|5.3.2 \|b\|\|	2
Nearside Front Brake lever has inadequate reserve travel \|3.1.3b\|	2
Rear Exhaust noise is clearly in excess of that emitted by a similar motor bicycle fitted with a standard silencer in average condition \|7.1.2\|	2
Headlamp aim headlamp deteriorated and function impaired \|1.2.3a\|	2
Front Fork yoke deformed \|2.1.1b\|	2
Horn sounds harsh or grating \|1.7.3c\|	2
Rear Roller brake test indicates a sticking brake \|3.3.A1a\|	2
Front Brake component worn and seriously reduced in strength \|3.2.A1\|	2
Front Horn not working \|1.7.3a\|	2
Nearside Front Stop lamp does not illuminate immediately a brake applies \|1.3.1a\|	2
Handlebar mounting clamp bolt loose \|2.1.1a\|	2
Rear position lamp insecure \|1.1.1c\|	2
Rear position lamp adversely affected by the operation of another lamp \|1.1.3b\|	2
Headlamp insecure \|4.1.1 \|c\|\|	2
Headlamp not working on dipped beam \|4.1.1 \|a\| \|ii\|\|	2
Headlamp not working on main beam \|4.1.1 \|a\| \|ii\|\|	2
Rear Rear reflector on motorcycle obscured \|1.4.2b\|	2
Fairings insecure and likely to impede the steering \|2.1.2e\|	2
Rear Brake lever is inoperative \|3.1.3c\|	2
Rear Rear wheel has a loose wheel nut\|s\| \|4.2.3a\|	2
Rear Valve stem seriously damaged \|5.2.3 \|j\|\|	2
Front Upper Steering headbearing has excessive free play \|2.2.2\|	2
Front Direction indicators not working \|1.5.1c\|	2
Front Stop lamp not working (4.3.1 (a) (ii))	2
Front Headlamp not working on dipped beam (4.1.1 (a) (ii))	2
Horn not working (7.7 (a) (ii))	2
All direction indicators not working (4.4.1 (a) (ii))	2

MOT History from tests of petrol YAMAHA YN50s year 1999

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