Champion Spark Plug Spark Plug P/N:9402
Champion 910 spark plug for the 1973-1975 Honda ST90 and other vehicles fires the spark that ignites the fuel mixture in a small engine. It is a standard replacement P10Y plug from the Champion Copper Plus Small Engine line.
A worn plug can show up as hard starting, a rough-running engine or a misfire. These signs alone do not prove the plug is at fault, since a clogged air filter can cause them too.
This plug fits the 1973-1975 Honda ST90, the 1967 Honda CL90 Scrambler and the 1965 Honda S90, and is built to meet OE fit, form and function. The 1973-1975 Honda ST90 takes one.
Fit and size
Build and materials
Interchange: 4173 · P10Y · P12Y · X16FSRU · X16FSU · 3326 · 4623 · D5HS · DR4HS · DR5HS
This part cross-references / interchanges with the following part numbers:
Is the Champion 910 spark plug right for the 1973-1975 Honda ST90?
Yes, the Champion 910 spark plug fits the 1973-1975 Honda ST90, and that bike takes one plug.
What thread diameter and seat does this spark plug have?
This plug has a 12 mm (0.472 in) thread diameter and a flat seat.
Does this spark plug come pre-gapped?
Yes. It comes pre-gapped at 0.58 mm (0.023 in), which simplifies installation.
How can I tell if a small engine spark plug is worn?
With the engine off and cool, look for a worn-down electrode, heavy deposits or a cracked insulator. Hard starting or a misfire can also point to a worn plug.
Does the Champion 910 replace the P10Y plug?
Yes, the Champion 910 is listed as a replacement for P10Y, along with 4173 and D5HS.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.