# Motorcycles and Misfuelling: A Growing Problem in New Zealand

> Motorcycle misfuelling incidents are on the rise in New Zealand. Here is why, what the consequences are for a motorcycle's engine, and what to do if it happens to you.

- Canonical URL: https://www.eek.nz/news/motorcycle-misfuelling-growing-problem-nz
- Published: 2025-10-14
- Author: EEK Mechanical
- Publisher: EEK Mechanical, a trade name of Forman Pacific, LLC

## Why Motorcyclists Are at Risk

Motorcycles in New Zealand are overwhelmingly petrol-powered, but the growth of diesel-powered adventure tourers and commuter bikes — and the increasing presence of diesel scooters imported from Europe and Asia — has created a new misfuel risk category. More significantly, motorcycle riders who own multiple vehicles — a diesel car and a petrol motorcycle — are at elevated risk of fuel type confusion during a routine fill.

## What Diesel Does to a Petrol Motorcycle Engine

Diesel in a petrol motorcycle engine causes fouled spark plugs, misfiring, and in most cases immediate stalling. The engine will not run well on diesel, which provides a faster warning than in a diesel car with petrol contamination. However, starting a motorcycle on a diesel-contaminated mixture and riding even a short distance will contaminate the fuel system and may require carburettor or fuel injector cleaning, a full flush, and in some cases, plug and injector replacement.

## Immediate Response

If you notice your motorcycle running strangely after refuelling, pull over immediately and do not restart. Call EEK Mechanical on [0800 769 000](tel:0800769000) — our technicians can assist with motorcycle misfuel recovery in most New Zealand locations.

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Source: https://www.eek.nz/news/motorcycle-misfuelling-growing-problem-nz