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SMC 631S

1977 Yamaha Unknown

Black Petrol 653cc
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MOT Status

Valid
Expires16 Mar 2027
Tests1 (1 pass, 0 fail)
Pass rate100%

Mileage

155 mi
Last recorded155 miles
Recorded on17 Mar 2026
Typical for 1977 Yamaha Unknown14,523 mi

Below or average mileage for this year

4 checks still locked for this Yamaha
Stolen
Finance
Write-off
Keepers
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Vehicle Details

RegistrationSMC 631S
MakeYamaha
ModelUnknown
Year1977
ColourBlack
Fuel typePetrol
Engine653cc

All premium checks include

50+ data points
Finance Check (Experian) Insurance Write-off Salvage Auction Stolen Check Previous Owners Ex-Taxi, Police, NHS Mileage Anomaly Import / Export Scrapped Check Plate Changes

MOT History

1 pass
Pass 17 Mar 2026 155 miles

How Reliable is the Yamaha Unknown?

Based on 20,218 MOT tests across 8,531 vehicles.

86.8%
Pass Rate
257
Miles/Year
52
Year Lifespan
8,531
On UK Roads
Full Yamaha Unknown reliability report

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SMC 631S is a 1977 Yamaha Unknown in Black with a 653cc petrol engine. This vehicle has been through 1 MOT test with a personal pass rate of 100%.

Across all 1977 Yamaha Unknown models, the average MOT pass rate is 83.9% with a typical mileage of 14,523 miles. This particular vehicle has performed better than the average for its year.

The Yamaha Unknown typically stays on UK roads for around 52 years. At 49 years old, this Yamaha Unknown is approaching the upper end of the typical lifespan for this model.

Frequently Asked Questions

How do I check the history of SMC 631S?

You can check the full history of SMC 631S by running a full vehicle check. This shows you finance, stolen, write-off, MOT history, mileage records and more.

What year was SMC 631S registered?

SMC 631S is a 1977 Yamaha Unknown, first registered on 5 August 1977.

Is SMC 631S safe to buy?

The MOT history for SMC 631S shows 1 test with a 100% pass rate. To check for outstanding finance, stolen markers, write-off history and mileage discrepancies, run a full vehicle check.

Does SMC 631S have outstanding finance?

Finance checks require a premium vehicle report. This checks against all major UK finance providers to see if there is any outstanding finance on SMC 631S. If you buy a car with outstanding finance, the finance company can repossess it.

No warranty or guarantee of accuracy is provided for any free data on this page. The data guarantee applies only to information obtained through the purchase of a full check.