Should I check the MOT history before buying a 2021 Sym Jet 4 125 E4?

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 2021 Sym Jet 4 125 E4?

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 2021 Sym Jet 4 125 E4?

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.

Is the 2021 Sym Jet 4 125 E4 reliable?

Based on MOT data from 118 vehicles, the 2021 Sym Jet 4 125 E4 has a first-time MOT pass rate of 83.3%, 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 2021 Sym Jet 4 125 E4?

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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Sym Jet 4 125 E4 (2021)

118 real MOT outcomes analysed • 83.3% first-time pass rate

2021 Sym Jet 4 125 E4

CarHunch analysed 118 real MOT records for the 2021 Sym Jet 4 125 E4. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
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AI Analysis Reliability Overview Check a Specific Reg Buyer's Checklist Pass Rate by Fuel Mileage Distribution MOT Averages Compare Models

The 2021 SYM JET 4 125 E4 is a serious reliability concern: just 41.1% pass first time against the UK average of 80%, meaning nearly six in ten fail their MOT. With 12.7% of vehicles having suffered dangerous defects, this scooter presents genuine safety risks that should give any buyer pause.

At just under 10,000 miles median mileage, these machines are still relatively young and lightly used, yet they're already racking up problems—averaging 0.9 advisories per vehicle and a CarhunchScore of just 40. Before committing to one, get a pre-purchase inspection focused on brake condition and suspension integrity, since advisory patterns suggest those are consistent weak points on this model.

We have limited data for the 2021 Sym Jet 4 125 E4 — treat the figures below as indicative rather than definitive.

⚠️ Around 1 in 8 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

83.3%

UK average ~80%

Around average

Dangerous (ever)

12.7%

At least once in MOT history

Check this vehicle

Avg failures / car

0.22

Over 1.5 tests on record

Low

Typical mileage

10k

Middle half: 7k–16k

For context

These stats describe 118 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.

Average reliability — agree?

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 118 Sym Jet 4 125 E4 cars.

Before you buy a 2021 Sym Jet 4 125 E4

Based on MOT data from 118 vehicles — here's what to check.

📋 Check the full MOT history. 12.7% 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%)	116	83%	0.22

Mileage Distribution

Most 2021 Sym Jet 4 125 E4 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.

9,941

typical

6,512

low mileage

15,996

high mileage

Half of all 2021 Sym Jet 4 125 E4 vehicles fall between 6,512 and 15,996 miles.

Is the mileage you're seeing normal?

✓ Under 6,512 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.

✓ 6,512–15,996 miles — normal for age. This is where most 2021 Sym Jet 4 125 E4s sit.

⚠ Over 21,594 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

MOT History Averages

1.5

Avg MOT tests per vehicle

0.22

Avg failures per vehicle

0.9

Avg advisories per vehicle

Other model years — Sym Jet 4 125 E4: All Jet 4 125 E4 years → Which year to buy? →

2017 2018 2019 2020

Or browse all models: Sym →

Compare with another model

See how the 2021 Sym Jet 4 125 E4 stacks up against a rival.

Average reliability — agree?