Polaris Big Boss Spark Plug
The Polaris Big Boss (250cc) takes an NGK BKR5E spark plug, gapped to 0.028".
Key takeaways
- Spark plug: NGK BKR5E.
- Iridium upgrade: NGK BKR5EIX.
- Gap: 0.028 inch - set it before fitting.
- Covers 1985-2003 (plug changed across years - see table).
Buy the plugs for your Polaris Big Boss
The standard plug is the exact-fit replacement. The iridium version drops into the same spot, lasts longer, and fires a little stronger for a few dollars more. Many engines take more than one - check how many cylinders you have.
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Polaris Big Boss spark plugs by year
| Years | Standard | Iridium | Gap |
|---|---|---|---|
| 2002-2003 | BKR5E | BKR5EIX | 0.028" |
| 1985-1986 | CR6HSA | CR6HIX | 0.028" |
Frequently asked
What spark plug does a Polaris Big Boss take?
The Polaris Big Boss takes an NGK BKR5E spark plug, gapped to 0.028 inch. The iridium upgrade is the BKR5EIX. See the by-year table for earlier models.
What is the spark plug gap for a Polaris Big Boss?
The spark plug gap for the Polaris Big Boss is 0.028 inch. Check and set the gap before fitting a new plug - most powersports plugs need a small adjustment out of the box.
Can I use an iridium plug in a Polaris Big Boss?
Yes. The BKR5EIX is the iridium version of the BKR5E - same fit, longer life, and a slightly stronger spark. It is a straight upgrade.
More parts for your Polaris Big Boss
We cover the other consumables for your machine too - the exact fit, cited, in one place.