Poulan 2375 Coil Gap (Spark Specs & Check)
For the Poulan 2375, set the ignition-coil air gap to 0.010–0.014 inch (0.25–0.36 mm). Set the spark-plug electrode gap to 0.025 inch (0.64 mm), using a Champion RCJ7Y or the exact plug specified for your saw. Work outdoors on a cool, stable saw, and use a spark tester rather than holding a plug by hand.
As temperatures shift and stored saws come back out for seasonal cutting, a no-start can send you straight to the ignition coil. Before turning screws, confirm the exact model suffix on your saw and check its manual or emissions label. Parts and specifications can vary among production versions, so use the figures below only after confirming they apply to your 2375.
The coil gap and plug gap are two different settings. The coil gap is the physical clearance between the ignition module and flywheel; the plug gap is the space between the spark plug’s electrodes. Mixing them up can leave you with a saw that still will not start.
Equipment Setup & Safety Preparation
The coil air gap sets the clearance between the ignition module and flywheel. For a compatible Poulan 2375-family saw, the reference range is 0.010–0.014 inch (0.25–0.36 mm). Confirm the model details first, then prepare the saw so you can inspect and adjust it without exposing yourself to moving parts or fuel vapor.
Confirm the specifications and prepare the saw
A model suffix identifies a particular version of a saw. Check the model plate, emissions label, and manual before ordering a module or plug, or applying a setting. If the documents for your exact saw give a different figure, follow the manufacturer’s information for that version.
| Item | Reference specification | What it applies to |
|---|---|---|
| Ignition-module air gap | 0.010–0.014 in (0.25–0.36 mm) | Clearance between module legs and flywheel |
| Spark plug | Champion RCJ7Y, or exact specified equivalent | Plug type; confirm for your model |
| Plug electrode gap | 0.025 in (0.64 mm) | Space between the plug electrodes |
| Fuel mix | 40:1 gasoline to 2-cycle oil | 3.2 US fl oz oil per 1 US gal gasoline |
Before you open the saw, take these steps:
- Work outdoors, with the saw cool and away from flames, sparks, and fuel spills.
- Wear eye protection and gloves. Set the saw on stable ground, engage the chain brake, and keep the bar and chain clear of people and objects.
- Remove the ignition lead from the spark plug before handling the plug or adjusting the coil.
- Keep the fuel cap closed during spark testing, and do not test beside an open fuel system or fuel-soaked parts.
I treat the safety setup as part of the repair, not an optional extra. A spark test can ignite fuel vapor. Keep hands, loose clothing, and tools away from the flywheel and chain whenever the engine might turn.
Field Cutting / Spark-Test Procedure
A careful check moves from the plug to the coil, then to a controlled spark test. The goal is to confirm the basic settings and isolate a fault without guessing. Make one change at a time, keep the ignition lead disconnected during adjustment, and refit covers before attempting to start the saw.
Inspect the plug and set the coil gap
A feeler gauge measures a small clearance in a repeatable way. Use a nonmagnetic gauge in the specified range; do not set the gap by eye or use a magnetic steel gauge that could be pulled toward the flywheel.
- Inspect the plug and wiring. Check the plug lead, boot, visible wiring, and kill-switch circuit for damage or chafing. Examine the plug insulator and electrodes for cracks, carbon deposits, or fuel wetness. Clean or replace a defective plug, and set the electrode gap to 0.025 inch (0.64 mm).
- Open the ignition area. Remove the starter or flywheel cover as needed to access the module and flywheel. Keep screws and parts organized. Do not pull or pry on wires.
- Position the flywheel. Turn it until its magnets face the ignition module. Loosen the module screws enough that the module can move; do not remove them.
- Set the clearance. Place a nonmagnetic feeler gauge measuring 0.010–0.014 inch (0.25–0.36 mm) between the flywheel and the module legs. Let the magnets draw the module toward the gauge. Hold the module in place and tighten its screws.
- Check both sides. Remove the gauge and rotate the flywheel by hand. Confirm the flywheel does not touch or drag on the module. Recheck the clearance at both module legs; loosen and reset the module if the clearance is outside the reference range or uneven.
A coil gap that is too wide can contribute to weak or intermittent spark. A gap that is too narrow can let the flywheel contact the module. Neither condition is corrected by changing the plug-electrode gap.
Test spark without hand-holding the plug
An inline or adjustable spark tester checks whether ignition voltage reaches the plug lead. Follow the tester’s instructions, keep it clear of fuel vapor, and never hold a removed plug or lead by hand against the cylinder to look for spark.
After setting the coil, reconnect the lead to the tester as directed and keep the tester away from the open fuel cap, spills, and fuel-wet surfaces. Keep your hands and tools clear of the flywheel and chain while cranking. Refit covers before starting the saw. If the tester shows no spark, repeat the check with a known-good, correct plug and inspect the lead and kill-switch wiring before condemning the ignition module.
| What you find | Next check |
|---|---|
| Spark is present, but saw will not start | Check fuel delivery, compression, and exhaust restriction |
| No spark with the original plug | Try a known-good plug of the correct type and gap |
| Still no spark with a known-good plug | Inspect the lead, boot, kill-switch wiring, module fasteners, and flywheel |
| Flywheel touches the module | Reset the air gap and rotate the flywheel to check for contact |
Maintenance, Sharpening & Ignition Diagnosis
Ignition diagnosis means checking the plug, coil clearance, wiring, and related parts in a logical order. A correct air gap does not prove that the module or wiring is good, and a no-start does not prove that the coil is bad. Use each test to narrow the fault before replacing parts.
Use symptoms to guide the next check
I have seen a common diagnostic trap: a saw has no visible spark, so the coil gets blamed before anyone checks the plug boot or kill-switch wire. Those parts can interrupt ignition too. Treat the following examples as diagnostic patterns, not proof of a specific failure.
- Illustrative case: no spark after storage. The owner finds a dirty, fuel-wet plug and assumes the coil gap has changed. The useful sequence is to inspect and correctly gap or replace the plug, then test with a proper spark tester. If spark remains absent, inspect the lead and kill-switch circuit before replacing the module.
- Illustrative case: intermittent spark after coil work. A saw starts inconsistently after the module has been disturbed. Check the clearance at both legs, make sure the screws are secure, and rotate the flywheel by hand to rule out contact. If the gap is correct but the fault remains, inspect wiring and flywheel condition.
If spark remains absent with a correct plug and verified gap, look for damaged or chafed wiring, a kill circuit that is grounding the ignition, loose module fasteners, or flywheel damage. Replace a part only after you have isolated a fault; repeated gap adjustments will not repair a broken wire or a defective component.
If spark is present but the engine still does not start, move on instead of repeatedly changing the coil setting. Check fuel delivery, compression, and exhaust restriction using the manual’s procedure or a qualified service technician if you lack the tools or experience.
Storage & Seasonal Care
Storage care helps keep the ignition parts ready for the next start. Fuel age and poor storage can create problems that look like an ignition fault, while dirt or damaged wiring can undermine a sound coil setting. Follow the exact saw manual and fuel-product directions when preparing the 2375 for storage.
Prepare the saw before putting it away
Use fresh fuel mixed at the specified 40:1 ratio if that is the ratio confirmed for your model. That equals 3.2 US fluid ounces of 2-cycle oil per 1 US gallon of gasoline. Measure both parts accurately rather than estimating, and follow the oil maker’s instructions for mixing and storage.
Drain or stabilize fuel as directed by the Poulan manual and fuel-product label. Store the saw in a cool, dry place away from ignition sources. Before returning it to service, inspect the plug, lead, boot, and visible wiring, and clean the air filter as the manual directs. A clean filter does not set the coil gap, but it can prevent you from misdiagnosing an engine problem as an ignition fault.
Frequently Asked Questions
What is the Poulan 2375 ignition-coil gap?
The reference coil-to-flywheel air gap is 0.010–0.014 inch (0.25–0.36 mm) for a compatible 2375-family saw. Confirm the exact model and manual before setting it.
What spark-plug gap should I use?
The reference electrode gap is 0.025 inch (0.64 mm). Use the plug specified for your saw; the common reference is a Champion RCJ7Y or its exact specified equivalent.
Are the coil gap and spark-plug gap the same?
No. The coil gap is the physical clearance between the ignition module and flywheel. The plug gap is the space between the spark plug’s electrodes.
Can I set the coil gap by eye?
No. Use a nonmagnetic feeler gauge in the specified range. An estimate by eye cannot reliably confirm a clearance measured in thousandths of an inch.
Can I use a magnetic steel feeler gauge?
Do not use a magnetic steel gauge for this procedure. The flywheel magnets may pull it toward the flywheel. Use a nonmagnetic gauge and keep it clear of moving parts.
How do I check for spark safely?
Use an inline or adjustable spark tester according to its instructions. Keep it away from fuel vapor and spills. Do not hold a removed plug by hand against the cylinder.
What if the coil gap is correct but there is no spark?
Test with a known-good, correct plug. Then inspect the plug lead, boot, kill-switch wiring, module fasteners, and flywheel for damage before replacing the ignition module.
What if the saw has spark but still will not start?
Stop adjusting the coil gap. Check fuel delivery, compression, and exhaust restriction using the saw manual’s diagnostic steps.
What fuel mix is listed for the 2375?
The reference ratio is 40:1 gasoline to 2-cycle oil, or 3.2 US fluid ounces of oil per 1 US gallon of gasoline. Verify the ratio in the manual for your exact model.
Should I test spark near the fuel tank?
No. Test outdoors, away from fuel spills, an open fuel cap, or fuel-wet parts. A spark can ignite fuel vapor.
(This article was written by one of our staff writers, David Hensley. Visit our Meet the Team page.)
