Should I check the MOT history before buying a 2018 Sinnis Rsx 125?

Yes. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. A full MOT history analysis will highlight patterns that a single test result won't reveal.

What corrosion should I look for when inspecting a 2018 Sinnis Rsx 125?

Check brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that is expensive to fix and can fail an MOT.

How are tyres and brakes typically on a 2018 Sinnis Rsx 125?

Tyres and brakes are the most common advisory items on vehicles of this age. Budget for replacement if they are near the limit, and factor this into your offer price.

How many 2018 Sinnis Rsx 125 vehicles have had dangerous defects recorded?

29% of these vehicles have had a dangerous defect recorded. Search the registration on CarHunch — the full MOT history will show exactly what was flagged and whether it was resolved.

Is the 2018 Sinnis Rsx 125 reliable?

Based on MOT data from 116 vehicles, the 2018 Sinnis Rsx 125 has a first-time MOT pass rate of 72.6%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

Do I need an HPI check when buying a 2018 Sinnis Rsx 125?

Yes. The MOT history will not show outstanding finance, insurance write-offs, or stolen status. An HPI check covers these areas and should be part of any used car purchase.

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Sinnis Rsx 125 (2018)

116 real MOT outcomes analysed • 72.6% first-time pass rate

2018 Sinnis Rsx 125

CarHunch analysed 116 real MOT records for the 2018 Sinnis Rsx 125. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
Which year to buy? →

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AI Analysis Reliability Overview Check a Specific Reg Buyer's Checklist Pass Rate by Fuel Mileage Distribution Still on the Road MOT Averages Compare Models

The 2018 SINNIS RSX 125 is a genuine reliability concern, with a first-time pass rate of just 53.8%—nearly 27 percentage points below the UK average of 80%. More worryingly, 28.4% of these bikes have recorded dangerous defects during MOT, well above acceptable levels and a serious red flag for any potential buyer.

These machines average only 7,597 miles at test time, suggesting they're not rack up heavy use, yet they're still failing at rates that indicate fundamental build or maintenance issues rather than wear-and-tear problems. With 0.8 failures and 2.9 advisories per vehicle on average, you're looking at persistent mechanical gremlins—so if you're considering one, budget for remedial work immediately after purchase and factor in ongoing maintenance costs that will likely exceed this bike's market value.

We have limited data for the 2018 Sinnis Rsx 125 — treat the figures below as indicative rather than definitive.

⚠️ Over 1 in 5 of these vehicles have had a dangerous MOT failure at some point — usually tyres or brakes, and often a one-off issue rather than a persistent problem. The group stats won't tell you which one you're looking at.

First-time pass

72.6%

UK average ~80%

Below average

Dangerous (ever)

28.5%

At least once in MOT history

Check this vehicle

Avg failures / car

0.8

Over 2.9 tests on record

Moderate

Typical mileage

Middle half: 4k–10k

For context

These stats describe 116 vehicles as a group. The specific vehicle you're looking at could be the one good example or the one outlier. Run its registration to find out.

Buyer beware — pass it on

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 116 Sinnis Rsx 125 cars.

Before you buy a 2018 Sinnis Rsx 125

Based on MOT data from 116 vehicles — here's what to check.

📋 Check the full MOT history. 28.5% of these vehicles have had a dangerous defect recorded - recurring advisories often signal problems years before they become failures.
Search the reg on CarHunch for the full MOT history, reliability stats and a free AI-powered analysis of that exact vehicle.
🔍 Brake pipes, sills and subframes are the key areas on a vehicle this age — structural rust is hard to spot without getting underneath. A mechanic will check all of this before you commit, and give you a concrete basis to negotiate on price. Inspection →
📄 Outstanding finance, insurance write-offs and clocking won't appear in the MOT records — a dedicated history check covers all of this. Our link gets you 20% off automatically. History Get 20% off via CarHunch

Pass Rate by Fuel Type

Fuel type	Vehicles	Pass rate	Avg failures
Petrol (98%)	114	72.4%	0.81

Mileage Distribution

Most 2018 Sinnis Rsx 125 vehicles sit in the blue band. If the vehicle you're looking at is outside it, it's either unusually low or high mileage for its age.

6,078

typical

3,690

low mileage

9,832

high mileage

Half of all 2018 Sinnis Rsx 125 vehicles fall between 3,690 and 9,832 miles.

Is the mileage you're seeing normal?

✓ Under 3,690 miles — lower than most. Could be great, or could be a vehicle that rarely moved. Check test frequency and mileage progression in the MOT history.

✓ 3,690–9,832 miles — normal for age. This is where most 2018 Sinnis Rsx 125s sit.

⚠ Over 13,273 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2018 Sinnis Rsx 125 — Still on the Road

Numbers are thinning — 39% of 2018 Sinnis Rsx 125s are still active.

Numbers are declining — 24 vehicles still getting MOTs in 2025 (39% of peak).

Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2021–2025.

MOT History Averages

2.9

Avg MOT tests per vehicle

0.8

Avg failures per vehicle

2.9

Avg advisories per vehicle

Other model years — Sinnis Rsx 125: All Rsx 125 years → Which year to buy? →

2019

Or browse all models: Sinnis →

Compare with another model

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Buyer beware — pass it on