# Oregon 42-087 In-Line Spark Tester for Mower and Small-Engine Checks

Oregon 42-087 in-line spark tester for checking ignition spark during mower and power-equipment troubleshooting.

- [Original product page](https://www.ofertitastop.com/ca/product/oregon-42-087-in-line-spark)
- [View offer](https://www.ofertitastop.com/ca/visit/oregon-42-087-in-line-spark)
- Market: CA
- Language: en-CA
- Currency: CAD
- Product updated: 2026-10-17T22:47:04.783Z
- Brand: Oregon
- Model: 42-087
- SKU: ofertitastop-ca-5054
- Category: Hardware > Tools > Measuring Tools & Sensors > Electrical Testing Tools
- Source store: amazon CA
- Active deal: Yes
- Price: 15.21 CAD
- Previous price: 20.98 CAD
- Discount: 28%
- Rating: 4.5 / 5
- Reviews: 1745

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## Description

The in-line format makes the Oregon 42-087 a focused tool for checking ignition spark during engine troubleshooting. Its red and black colour scheme identifies the tester at a glance among workshop tools.

When a mower will not start, checking for spark is one practical step in narrowing down the cause. This tester is made for that kind of ignition check, rather than replacing a part based only on a no-start symptom.

Choose an in-line spark tester when you want a dedicated way to assess spark, choose replacement ignition parts when a fault has already been identified and the relevant part needs replacing.

## How to use it

Use the Oregon 42-087 as an in-line spark tester when investigating an ignition issue on power equipment. It gives the check a clear purpose: help determine whether spark is present as part of a broader troubleshooting process. For example, during a mower service, it can be used while working through a no-start problem before deciding what to inspect next.

The tester is a diagnostic aid, not a replacement for the equipment’s service procedure. Follow the instructions for the machine being serviced when carrying out an ignition check. This keeps the tool’s role straightforward: check for spark, then use that information alongside other relevant checks rather than assuming one symptom identifies the failed component.

## What stands out

Oregon identifies this as a genuine replacement spark tester. The in-line design is purpose-built for spark testing, giving it a specific role in a small-engine maintenance kit instead of asking a general-purpose tool to serve as an improvised diagnostic aid. Its red and black colours also make it easy to pick out when organizing equipment and service tools.

For routine mower maintenance, the tester can support a more methodical response to starting trouble: check ignition spark as one part of diagnosis, then proceed with the appropriate service steps. That makes it relevant to owners and repairers who want to investigate an ignition concern before selecting replacement components. It is a practical choice when the priority is checking spark, while a replacement plug, lead or other repair part is the better purchase once the specific component needing attention is known.

## Tech specs

- Name: Oregon in-line spark tester
- Type: Replacement spark tester
- Format: In-line
- Colour: Red and black
- Dimensions: 13.72 x 10.67 x 2.79 cm
- Weight: 4.54 g
- Model: 42-087

## Should you buy it?

The Oregon 42-087 suits maintenance work where checking ignition spark is part of diagnosing a mower or other power-equipment starting issue. Its dedicated in-line tester format keeps the task clear, and the Oregon replacement-part identity makes it easy to specify by model when organizing service tools or sourcing the same tester again. Choose it for a practical spark check within a broader troubleshooting process, especially when you want to gather diagnostic information before moving on to a repair.

## Images

![Oregon 42-087 In-Line Spark Tester for Mower and Small-Engine Checks — 1](https://www.ofertitastop.com/i/E-YKbRwYbo2VcgB_RHS6aP2ae-2FsAJg0EAizLZWmggV_xFJS_vQ3VENv1RGPsdMlzdBH2w2LbHXm_00MXMXPQko-fRcGRYJc7q83rkRFrSoIM4k38KoKD9uTw.jpg)

![Oregon 42-087 In-Line Spark Tester for Mower and Small-Engine Checks — 2](https://www.ofertitastop.com/i/-s74nUYoAoZ12watahsuMn1znpzrpDMdEyOiUo7FWjXqt6lXHuT94X0JJ6ifktLg1Dbm3YSEnLO-ccdNubI2LBUNe2BNQTyRBSO6SFEtJOdggN3lvQ2xaKtZNA.jpg)

![Oregon 42-087 In-Line Spark Tester for Mower and Small-Engine Checks — 3](https://www.ofertitastop.com/i/7PlWOYTeDl-pO2I47a6Klr77EVwC3GqPzoIB4FU5T8NVNqC7Q4rReuwPfW4c4oqli1oJvmOXX8bli6IMNlCgpq5WErSLtam1SuKJGfpKIe7oLtJGDxao0EKsiw.jpg)

![Oregon 42-087 In-Line Spark Tester for Mower and Small-Engine Checks — 4](https://www.ofertitastop.com/i/_vI8ZdOgBoOl9MGMx23ELkIFwWyGpQGnhDBWGKWCJFLJhdjqnwK8bDVGgr7zSd0lKmEF0w43mIjSr25r3YlNHQX6H12QGeHLF3bqsg_nZk7ekjMtkepPFqBkNA.jpg)