Briggs & Stratton — Testing Starter Motor Performance
Testing & diagnosis · Electric starter
From a Briggs & Stratton service manual — check it applies to your exact model before use.
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Before you start
- Do not clamp motor housing in a vise or strike with a steel hammer.
Procedure
- Install DC Shunt on the negative (-) battery terminal.
- Insert RED test lead into V-ohm receptacle and connect to RED post on shunt.
- Insert BLACK test lead into COM receptacle and connect to BLACK post on shunt.
- Rotate selector to 300mV position.
- Activate starter motor and note reading on meter and tachometer RPM.
- Compare to starter motor specifications for pinion type.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Nylon pinion: 6500 min RPM, 350 max Amperes
- Steel pinion: 7000 min RPM, 24 max Amperes
Source: Briggs & Stratton service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.