Sinnis Rsx 125 (2018)
2018 Sinnis Rsx 125
CarHunch analysed 116 real MOT records for the 2018 Sinnis Rsx 125. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
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.
What to check before buying a 2018 Sinnis Rsx 125
Practical pre-purchase checks for this age and model.
- 📋 Check the full MOT history. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. Enter the reg below for a full AI analysis.
- 🔍 Inspect for corrosion in person. Brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that's expensive to fix and can fail an MOT.
- 🛞 Check tyres and brakes. The most common advisory items at this age. Budget for replacement if they're near the limit — factor this into your offer price.
- ⚠️ 28.5% of these vehicles have had a dangerous defect recorded. Enter the reg below — the full MOT history will show exactly what was flagged and whether it was resolved.
- 📄 Run an HPI check. The MOT history won't show outstanding finance, insurance write-offs, or stolen status — an HPI check will.
Before you buy a Sinnis Rsx 125
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
CarHunch may earn a small commission if you buy via these links — at no extra cost to you.
Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Petrol (98%) | 114 | 53.3% | 0.81 |
| Other (2%) | 2 | 83.3% | 0.5 |
Mileage Distribution
Most 2018 Sinnis Rsx 125 vehicles sit in the blue band. If the car you're looking at is outside it, it's either unusually low or high mileage for its age.
Half of all 2018 Sinnis Rsx 125 vehicles fall between 3,690 and 9,832 miles.
2018 Sinnis Rsx 125 — Still on the Road
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
Found a specific Sinnis Rsx 125?
Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.
Other model years — Sinnis Rsx 125: