Starters & Solenoids

Do you only hear a click when you try to start, or does the engine crank too slowly? Here we bring together starter motors and starter solenoids for motorcycles, ATVs, personal watercraft and cars. This category is for you if you need to replace a worn starter motor or a faulty solenoid with a part that fits your exact model and year.

How the starter motor and starter solenoid work together

The starter motor is an electric motor that turns the engine over until it can run on its own. The starter relay – also called a solenoid – acts as a heavy-duty switch: a small current signal from the start button or ignition switch makes the relay connect the high current from the battery to the starter motor. Among the starter motors you will find, for example, 12V models from Arrowhead, and under starter solenoids there is, among others, a starter solenoid with relay from QuadBoss for the Yamaha YFZ450 and a starter solenoid from OMIX for Jeep CJ models with automatic transmission.

How to choose the right starter motor

Starter parts are rarely universal, so check these points before you order:

• Model and year: Many items are listed with exact models and years, because the fitment can change between model years of the same model.
• Voltage: The part must match the vehicle's electrical system, e.g. 12V.
• Mounting and drive gear: Compare the mounting holes, the number of teeth on the gear and the position of the cable connection with the old part.
• Solenoid connections: The number of terminals and the connector type must match your wiring harness.

In addition to Arrowhead, QuadBoss and OMIX, the category also includes parts from BikeMaster and TwinPower.

Troubleshoot before you replace

A weak start is not always caused by the starter motor. A single click without the engine turning over can be caused by a discharged battery, corroded terminals or a faulty solenoid, while an engine that cranks slowly typically points to the battery, charging or worn cables with high resistance. So measure the battery voltage and check the ground and positive connections before you replace parts. If the battery is the cause, you can move on to batteries and battery care, while charging systems and wiring and cables cover the rest of the circuit.

Frequently asked questions

How can I tell whether the starter motor or the solenoid is faulty?

If the solenoid clicks but the starter motor does not turn, the fault may lie in the starter motor or in the power supply to it. If there is no sound at all, the solenoid, the control signal or a fuse may be the cause. Measure the voltage at both parts before you order.

Should the starter solenoid be replaced together with the starter motor?

Not necessarily, as the two parts can wear independently of each other. However, if the solenoid has burnt contacts or has been exposed to high heat, it can make sense to replace both so you avoid a new failure shortly after.

Can I fit a new starter motor myself?

It depends on the vehicle and the location. Always disconnect the negative battery cable first, note the position of the cables and tighten the connections correctly. Loose or corroded connections can cause voltage drop and poor starting, even with a new starter motor.

How long can I hold the start button down?

The starter motor is not built for long, continuous operation and can overheat. Typically make short start attempts with pauses in between, and follow the vehicle's manual. If the engine does not start after a few attempts, you should find the cause rather than keep going.