Kick Starters
What Is a Kick Starter?
Kick starters are one of motorcycling's most fundamental mechanical systems. A kick starter is a foot-operated lever that manually cranks an engine's crankshaft, initiating the combustion cycle without any electrical assistance. When the rider pushes down on the lever, a ratcheting gear mechanism engages the crankshaft, spinning it past top dead center so an ignition spark can ignite the compressed fuel mixture — and the engine roars to life.
The internal workings are more intricate than the simple foot motion suggests. The kick starter lever connects via a splined shaft to a sector gear, which mates with the starter main shaft gear. As you push down, the gear chain turns the transmission's main shaft, ultimately rotating the crankshaft. A spring-loaded ratchet mechanism locks the system during the downstroke and disengages cleanly once the engine fires, allowing the lever to return to its folded, stowed position flush with the bike.
Why Kick Starters Still Matter
While most modern street motorcycles rely exclusively on electric starters, kick starters remain critically important in several riding disciplines and situations:
- Dirt bikes and motocross: Many serious off-road and competition riders prefer kick-only setups because electric starter components — motor, larger battery, charging system — add significant weight. A lighter bike handles and accelerates better on the track or trail.
- Backup reliability: On bikes equipped with both systems, the kick starter serves as a dependable failsafe when the battery is dead or the electric starter fails — especially important in remote off-road environments where a push start may not be possible.
- Classic and vintage machines: Older motorcycles were built exclusively around kick start technology, and maintaining or restoring those systems requires quality OEM-spec replacement parts.
- Scooters and mopeds: Smaller batteries on these platforms are more prone to discharge, making a functioning kick starter a practical everyday backup.
What to Look for When Shopping Kick Starters
Because kick starters are highly model-specific, fitment is the most critical factor. The kick starter shaft, gear ratio, and mounting configuration vary considerably between manufacturers and even between different engine variants from the same brand. Always verify compatibility with your specific year, make, model, and engine displacement before purchasing. Beyond fit, look for components made from high-strength steel or aluminum alloy that can withstand repeated high-force impacts without bending or cracking. The return spring and ratchet mechanism should also be inspected and replaced together with the lever assembly if wear is evident, since a worn ratchet can cause the lever to slip or fail to fully engage the crankshaft.
Top Brands in Kick Starters
When it comes to reliable kick starter components, Moose Racing is a trusted name among off-road and powersports enthusiasts. Founded in the mid-1980s near the Rocky Mountains, Moose Racing has spent decades producing hard parts and accessories specifically engineered for dirt, off-road, and ATV riders. Their components are meticulously tested for proper fit and long-lasting durability, making them a go-to source for replacement kick starter parts on a wide range of popular dirt bike and powersports platforms.