The 1921 Gardner Model G has one listed ignition part: a Spark Plug from CHAMPION, covering the All Engines — the only engine offered in the 1921 Gardner Model G. It includes a manufacturer part number and application notes.
On the 1921 Gardner Model G, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules.
The part number opens a page with every vehicle that part fits.
Spark Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CHAMPION | 561 | 🇺🇸 US | Copper PlusPre-Set Gap: 0.025" | View on Amazon |
This table covers the spark plugs for this engine. Typical signs include misfire under load, rough idle, or a flashing check-engine light. Verify the gap even on pre-gapped plugs, and replace coil boots that come off a high-mileage engine.
This group shows a single part: CHAMPION 561.
Buying Ignition Parts for a 1921 Gardner Model G
On this vehicle, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules.
- Confirm you have the All Engines engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Spark Plug .
Frequently Asked Questions
How many ignition parts fit the 1921 Gardner Model G?
This page lists one ignition part for the 1921 Gardner Model G: a Spark Plug from CHAMPION, covering the All Engines engine.
What are the signs of ignition problems on a 1921 Gardner Model G?
Common symptoms include misfires under load, rough idle, flashing check-engine light, or poor starting in damp weather. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What spark-plug gap is listed for the 1921 Gardner Model G?
Notes on this page include a 0.025" pre-set gap. Still verify against spec — even “pre-gapped” plugs should be checked before they go in.
What should I replace at the same time?
Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 1921 Gardner Model G was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 1921 Gardner Model G?
Every part on this page is matched to the All Engines engine. Then gap matters even on “pre-gapped” plugs — verify against spec, and replace coil boots when they come off a high-mileage engine. The notes column carries position and trim qualifiers where they apply.
Ignition Parts for Other Gardner Model G Years
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