Assembling a kickstarter on a pit bike: a complete guide with photos and diagrams

The kickstarter on a pit bike is not just a mechanism for starting the engine, but a key element of reliability, especially in extreme conditions. If your pit bike stops starting with your foot or the mechanism requires repair, self-assembly can save up to 15 000 ₽ on service services. But without knowing the nuances, it’s easy to make mistakes that will lead to gearbox failure or starter spring breakage.

This article contains a step-by-step analysis of the process: from disassembly to adjustment, taking into account the features of popular models (Honda CRF150R, KTM 50 SX). We will reveal 3 critical moments, which even experienced mechanics miss, and we will provide a checklist for checking the assembly. If this is your first time taking on this process, be prepared to require patience and torque wrench (without it there is a risk of overtightening the mounting bolts).

1. Preparation: tools and working conditions

Before you begin assembly, make sure you have everything you need. Working with a kickstarter requires not only a standard set of tools, but also special devices. For example, to remove the starter gear retaining ring you will need puller with claws — without it, you risk damaging the shaft grooves.

Here is a complete list of tools and materials:

• 🔧 Socket set and ratchet wrench (sizes: 8, 10, 12, 14 mm)
• 🔨 Hammer with a soft striker (for knocking out the shaft)
• 🧲 Magnetic tray (so as not to lose rollers and springs)
• 🛠 Torque wrench (tightening torque: 18–22 Nm for cover bolts)
• 🧴 Lubrication Molykote G-Rapid Plus (for gears and bearings)
• 📏 Vernier calipers (to check shaft play)

Work in a clean, well-lit area. Dust and dirt - the main enemies of the kickstarter mechanism: even small particles can jam the gears. If you are disassembling your pit bike outside, cover the exposed parts with a clean rag. And don’t forget to take photographs of each stage of disassembly - this will save you from mistakes during reassembly.

⚠️ Attention: If your pit bike is equipped electric starter, be sure to disconnect the battery terminals before starting work. A short circuit during disassembly can damage the relay regulator.

2. Disassembling the Kickstarter: Step by Step Process

Start by removing the kickstarter cover. On most pit bikes (Apollo RFZ, Lexmoto LXR 125) it is secured with 4–6 bolts. Unscrew them crosswise to avoid distortion. After removing the cover, you will see the starter mechanism: shaft, gear, spring and retaining ring.

Disassembly algorithm:

1. Remove the starter spring, having first secured it with wire (it may shoot out!).
2. Remove the kickstarter shaft. If it does not come out, gently tap it through the wooden spacer.
3. Remove the gear retaining ring using a puller. Don't use a screwdriver - this deforms the grooves.
4. Remove the gear and check its teeth for wear. Allowable play is no more than 0.3 mm.

Pay special attention to the condition shaft bearing. If a crunching sound is heard or play is felt during rotation, the bearing requires replacement. For pit bikes Yamaha PW50 And Kawasaki KX65 suitable bearing 6202-2RS (size 15×35×11 mm).

What to do if the shaft is jammed?

If the kickstarter shaft does not rotate even after removing the gear, the problem may be a deformed shaft or metal shavings. In this case, the shaft will need to be replaced (part number for Honda CRF110F — 28340-KZ3-003).

3. Diagnosis of faults: what breaks most often

According to service center statistics, 60% of kickstarter failures are associated with wear of three parts: spring, gear and retaining ring. Here are typical symptoms and their causes:

Symptom	Probable Cause	Solution
A characteristic crackling sound when pressing the lever	Broken gear teeth or worn circlip	Gear replacement (90504-12016 for Suzuki DR-Z70)
The lever falls without resistance	The return spring is torn or the shaft is bent	Replacing the spring (28341-KZ3-003) or shaft
Kickstarter rotation is tight	The grease has thickened or the bearing is damaged	Flushing and lubrication Liqui Moly LM 50

For an accurate diagnosis, use endoscope (price from 800 ₽). It will help to inspect the internal cavities without complete disassembly. For example, on pit bikes SSR SR125 Metal shavings often accumulate in the gear area - they can only be seen through an endoscope.

⚠️ Attention: If during disassembly you find cracks on the lid body, further use of the pit bike is dangerous! Vibration can cause the cover to break and debris to enter the engine.

4. Kickstarter build: critical moments

Begin assembly by installing a new bearing (if required). Before pressing, heat the lid body with a hair dryer to 80°C - this will make the process easier. The bearing must fit without distortions, otherwise it will quickly fail.

Assembly order:

Pay special attention spring orientation. On pit bikes Kayo T2 And Stels SB-200 its incorrect installation results in the starter lever not returning to its original position. Check the diagram:

[Крючок пружины] → [Отверстие в корпусе]
[Второй конец] → [Паз на валу]

After assembly, check the operation of the mechanism without starting the engine. The lever should:

• 🔄 Return to the starting position smoothly, without jamming.
• 🛑 Stop in the highest position (angle 30–35°).
• 🔊 Do not make any extraneous sounds when rotating.

5. Adjustment and testing after assembly

After installing the kickstarter cover, you need lever free play adjustment. On most models it should be 5–10 mm. Adjustment is made with a nut on the lever shaft (use a 13 mm wrench).

For testing:

1. Make sure the pit bike is in neutral gear.
2. Smoothly press the starter lever all the way 3-5 times. He must return without delay.
3. Start the engine using the kickstarter. If more than 2-3 clicks are required, check clearance between starter gear and clutch drum (nominal: 0.2–0.4 mm).

If the engine does not start and the lever falls, the problem may be clutch. On pit bikes KTM 50 SX Friction discs often wear out - their thickness should be at least 2.8 mm.

6. Common mistakes and how to avoid them

Even experienced mechanics make mistakes when assembling a kickstarter. Here TOP-3 most expensive (in terms of consequences):

• 🔧 Retightening the cover bolts → deformation of the housing and jamming of the shaft. Use a torque wrench!
• 🔄 Incorrect installation of the retaining ring → cutting off splines on the shaft. Check the fit of the ring with a puller.
• 🛢 Using the wrong lubricant → thickening at low temperatures. Suitable for pit bikes only semi-synthetic lubricant.

Another common problem is incompatibility of spare parts. For example, the kickstarter gear from Yamaha YZ85 not suitable for Honda CRF150R, despite the visual similarities. Always check the catalogs:

Pit bike model	Article number of the original gear	Analogue (if available)
Kawasaki KLX140	13083-0064	All Balls 22-1003
Suzuki DR-Z70	90504-12016	—

⚠️ Attention: If, after assembly, the starter lever “knocks” when driving over uneven surfaces, this is a sign weakened return spring. Do not ignore this symptom - over time, it will lead to spontaneous activation of the starter while driving.

7. Kickstarter Maintenance: How to Extend Lifespan

To avoid repeated disassembly, follow these guidelines:

• 📅 Every 10 operating hours check the starter lever play.
• 🛢 Every 3000 km, renew the lubricant in the mechanism (via a grease nipple, if available).
• 🚿 After washing the pit bike, blow the kickstarter area with compressed air - water accelerates shaft corrosion.

For pit bikes used in mud (Pitster Pro XR50, Thumpstar TS50), it is recommended to install protective case to the starter lever (part no. Tusk Kickstart Cover). This will reduce the entry of abrasive particles into the mechanism.

If you often drive through deep puddles, treat the kickstarter shaft anti-corrosion composition (For example, WD-40 Specialist). This will prevent the mechanism from rusting and seizing.

💡

Check the condition of the kickstarter shaft seal regularly. Its wear leads to oil entering the starter mechanism and accelerated wear of the spring.

Frequently asked questions about Kickstarter assembly

Is it possible to assemble a kickstarter without a torque wrench?

Technically yes, but the risk of overtightening the bolts increases 3 times. If you don't have a wrench, tighten the bolts by hand until they are snug, then back 1/4 turn. For aluminum covers (Apollo DB-X18) this is critical - over-tightening leads to cracks.

What lubricant should I use for the kickstarter gear?

The best option is Molykote G-Rapid Plus (withstands loads up to 1200 Nm). Alternative: Liqui Moly LM 50. Do not use Litol-24 or Solid oil — they thicken when heated and block the mechanism.

What should I do if the starter lever does not return after assembly?

There are two reasons:

1. The spring is installed upside down (check the orientation of the hooks).
2. The shaft is jammed due to insufficient lubrication (disassemble and re-lubricate).

On pit bikes Lexmoto LXR 50 also check the integrity of the plastic spring retainer - it often breaks during disassembly.

How much does it cost to repair a kickstarter at a service center?

The cost depends on the model:

• Chinese pit bikes (Zongshen, Lifan): 3000–5000 ₽.
• Japanese (Honda, Yamaha): 8000–12000 ₽.
• European (KTM, Husqvarna): 15000–20000 ₽.

Self-repair costs 2–3 times less (price of spare parts: 1000–4000 ₽).

Is it possible to drive without a kickstarter if it is broken?

Technically yes, but:

• On pit bikes without electric starter you'll have to start it "push-start".
• The absence of a kickstarter cover violates the tightness of the engine - dust will get into the crankcase.
• In competitions (for example, Pit Bike Racing) absence of a kickstarter is a reason for disqualification.