Welcome to the Scooter Vista range of Lambretta Gearbox & Kickstart Parts for LI, SX, TV, DL & GP models.
The Lambretta gearbox is one of the most important parts of the engine. It allows the rider to select the appropriate gear for starting, accelerating, cruising and climbing hills, while the kickstart mechanism provides a simple and reliable way of starting the engine.
Whether you're carrying out a complete Lambretta engine rebuild, replacing worn gearbox components, rebuilding a kickstart mechanism or changing the gearing on a performance engine, using the correct quality parts is essential.
At Scooter Vista, we stock a range of Lambretta gearbox, gear selector, kickstart and associated engine components for classic Lambretta models.
Our range is suitable for a wide variety of applications including:
- Lambretta LI
- Lambretta SX
- Lambretta TV
- Lambretta DL
- Lambretta GP
- Series 1
- Series 2
- Series 3
- Standard engines
- Touring engines
- Fast-road engines
- Performance and tuned engines
Always check the individual product description for exact model, gearbox and specification compatibility before ordering.
What Does a Lambretta Gearbox Do?
The gearbox controls how the engine's power is transferred to the rear wheel.
Unlike a direct-drive system, the gearbox provides several different ratios.
Lower gears provide increased torque for:
- Pulling away
- Climbing hills
- Carrying passengers
- Accelerating
Higher gears allow the scooter to travel at road speed while keeping engine RPM more manageable.
A correctly functioning gearbox should allow the rider to select each gear smoothly and hold the selected gear without jumping out.
Lambretta Gearbox Parts
A Lambretta gearbox contains a number of precision components that work together.
Depending on the model and specification, these can include:
- Gearbox gears
- Gearbox cluster
- Crown wheel
- Front sprocket
- Gear selector
- Selector spider
- Selector rod
- Gear selector spring
- Gearbox bearings
- Gearbox shims
- Gearbox end plate
- Gearbox oil seals
- Gearbox circlips
- Gearbox nuts
- Gearbox spacers
- Kickstart components
During a gearbox rebuild, every component should be inspected rather than assuming that only the obviously worn parts need replacing.
Lambretta Gearbox Gears
The individual gearbox gears determine the ratios available to the rider.
A worn gearbox can cause:
- Difficulty selecting gears
- Gears jumping out
- Excessive noise
- Poor gear changes
- Unusual gearbox wear
- Difficulty finding neutral
When rebuilding a gearbox, inspect the gear dogs and mating surfaces carefully.
If the engagement surfaces are badly worn, replacing the gear may be necessary.
Lambretta Gearbox Selector
The selector mechanism moves the individual gears into position.
It is operated through the gear control on the handlebars and transfers the rider's input to the gearbox.
A worn selector mechanism can cause:
- Difficult gear changes
- Excessive movement
- Poor gear engagement
- Gears jumping out
- Difficulty finding neutral
During a rebuild, inspect the selector mechanism and associated components for wear.
Lambretta Gear Selector Rod
The selector rod forms part of the mechanism that transfers movement from the selector system to the gearbox.
It needs to operate correctly and have the appropriate fit within the gearbox assembly.
When rebuilding an engine, check for:
- Wear
- Damage
- Bending
- Excessive play
- Damaged threads
A small amount of wear in the selector system can make a noticeable difference to gear selection.
Lambretta Gearbox Shims
Gearbox shims are extremely important when rebuilding a Lambretta gearbox.
They control the amount of end float within the gearbox assembly and help ensure the gears are correctly positioned.
Scooter Vista stocks a range of Lambretta gearbox shims from manufacturers and suppliers including:
- Scootopia
- AF Rayspeed
- MB Scooters
Our current range includes shims from 2.1 mm through to 3.1 mm, allowing the gearbox to be correctly set up rather than relying on a one-size-fits-all approach.
Correct gearbox shimming is particularly important during an engine rebuild.
Why Does a Lambretta Gearbox Need Shimming?
The gearbox components need to have the correct amount of controlled movement.
Too much end float can allow the gears to move excessively.
Too little clearance can cause the gearbox components to bind or operate incorrectly.
Correct shimming helps ensure that the gearbox operates smoothly and that the gears remain correctly positioned.
This is why gearbox shimming should be treated as an important part of a Lambretta engine rebuild rather than simply fitting the original shims back into place.
How to Check Lambretta Gearbox End Float
When rebuilding a Lambretta gearbox, the end float should be measured rather than guessed.
A typical process involves:
- Installing the gearbox components correctly.
- Fitting the appropriate gearbox end plate.
- Measuring the movement of the gearbox assembly.
- Comparing the measurement with the required specification.
- Selecting the appropriate shim thickness.
- Rechecking the end float.
- Confirming that the gearbox rotates freely.
Always use the specification appropriate to the gearbox and components being fitted.
If you're rebuilding a gearbox and are unsure about the required clearance, check the relevant workshop manual or manufacturer's instructions.
Lambretta Gearbox Bearings
The gearbox relies on bearings to allow the shafts and gears to rotate correctly.
Worn gearbox bearings can result in:
- Rumbling noises
- Excessive play
- Difficult gear selection
- Gearbox vibration
- Premature component wear
If an engine has been dismantled for a full rebuild, replacing old gearbox bearings can be worthwhile, particularly where there is evidence of wear or contamination.
Lambretta Gearbox Oil Seals
Oil seals help retain the gearbox oil and prevent unwanted leakage.
A damaged gearbox oil seal can result in:
- Oil leaks
- Low gearbox oil level
- Contamination
- Poor lubrication
Whenever an engine is being rebuilt, inspect all gearbox oil seals and replace them if required.
A new seal is considerably cheaper than repairing an engine that has suffered damage due to inadequate lubrication.
Lambretta Gearbox Oil
Correct lubrication is essential for gearbox life.
The gearbox gears, bearings and associated components rely on the correct oil to reduce friction and wear.
After rebuilding a gearbox:
- Check the correct oil specification.
- Fill to the appropriate level.
- Check for leaks.
- Recheck the oil level after initial running.
If the gearbox oil contains excessive metal particles, investigate the cause rather than simply replacing the oil.
Lambretta Gearbox Problems
Common gearbox problems can include:
Gears jumping out
Possible causes include:
- Worn gear dogs
- Incorrect gearbox shimming
- Worn selector components
- Incorrect gear alignment
- Damaged gearbox components
Difficulty selecting gears
Possible causes include:
- Worn selector
- Incorrect cable adjustment
- Damaged selector components
- Gearbox wear
- Incorrect end float
Gearbox noise
Possible causes include:
- Worn bearings
- Worn gears
- Incorrect shimming
- Insufficient lubrication
- Damaged components
Difficult neutral selection
Possible causes include:
- Incorrect selector adjustment
- Worn selector components
- Gearbox wear
- Incorrect cable setup
The cause should always be identified before replacing parts at random.
Lambretta Gears Jumping Out
One of the most frustrating Lambretta gearbox problems is a scooter that jumps out of gear.
This should not automatically be blamed on the gear cables.
The gearbox itself should be inspected if the problem persists after correct cable adjustment.
Potential causes include:
- Worn gear dogs
- Worn selector components
- Incorrect gearbox end float
- Damaged gears
- Incorrect assembly
A gearbox that repeatedly jumps out of gear should be inspected before continued use.
Lambretta Gearbox Rebuild
A complete Lambretta gearbox rebuild provides an opportunity to inspect every component.
A typical rebuild should involve checking:
- Gear teeth
- Gear dogs
- Gearbox cluster
- Selector
- Selector rod
- Gearbox bearings
- Gearbox shims
- End plate
- Oil seals
- Circlips
- Nuts
- Spacers
- Shafts
Any component showing significant wear should be replaced.
It is often more economical to replace worn components during the rebuild rather than dismantling the engine again later.
Lambretta Gearbox Rebuild – Shimming
One of the most important stages of a gearbox rebuild is setting the correct end float.
Do not simply reuse the original shim combination.
Components may have been replaced during the rebuild, and wear may have changed the original measurements.
A gearbox should be assembled, measured and adjusted using the correct shims.
Scooter Vista stocks 2.1 mm to 3.1 mm Lambretta gearbox shims, giving customers the ability to accurately set up their gearbox.
Lambretta Front Sprocket
The front sprocket works with the rear crown wheel to determine the final drive ratio.
Changing the front sprocket can therefore alter the overall gearing of the scooter.
A larger front sprocket generally raises the gearing, while a smaller sprocket generally lowers it.
The correct choice depends on:
- Engine capacity
- Power output
- Torque
- Gearbox ratios
- Rear crown wheel
- Rider weight
- Intended use
- Wheel size
For example, a touring engine may benefit from different gearing compared with a high-revving performance engine.
Lambretta Crown Wheel
The crown wheel forms part of the final-drive gearing.
It works with the front sprocket to determine the final drive ratio.
When changing the gearing of a Lambretta engine, the front sprocket and crown wheel should be considered together.
A gearing change can dramatically affect:
- Acceleration
- Cruising RPM
- Hill climbing
- Top speed
- Engine temperature
- Overall riding characteristics
Lambretta Gearbox Ratio
Choosing the correct gearbox ratio is particularly important when building a performance Lambretta engine.
A standard gearbox and gearing combination may work well with a standard engine but become unsuitable when a larger cylinder, performance exhaust and larger carburettor are installed.
A performance engine needs gearing that matches its power characteristics.
For example:
Too low a gear ratio
The engine may rev excessively at cruising speed.
Too high a gear ratio
The engine may struggle to pull top gear.
The ideal gearing allows the engine to operate in the part of the RPM range where it produces useful power and torque.
Lambretta Touring Gearing
For a touring Lambretta, gearing should be selected around the intended riding conditions.
A touring engine may spend considerable time cruising at road speed, so excessively short gearing can result in unnecessarily high engine RPM.
However, gearing that is too tall can make the engine struggle, particularly:
- On hills
- Into headwinds
- With a passenger
- With luggage
The correct combination depends on the engine's torque and power characteristics.
Lambretta Performance Gearing
Performance engines often have different gearing requirements from standard engines.
A tuned 200 cc engine, for example, may be capable of pulling gearing that a standard 150 cc engine cannot.
When selecting performance gearing, consider the complete engine:
- Cylinder
- Crankshaft
- Carburettor
- Exhaust
- Ignition
- Gearbox
- Front sprocket
- Crown wheel
Changing only one part of the gearing without considering the complete combination can result in an engine that doesn't perform as expected.
Lambretta Kickstart Mechanism
The kickstart mechanism allows the rider to rotate the engine manually to start it.
The kickstart mechanism includes several components working together, including:
- Kickstart shaft
- Kickstart piston
- Kickstart spring
- Kickstart gear
- Kickstart lever
- Piston pin
- Associated washers and hardware
A worn kickstart mechanism can result in:
- Slipping
- Poor engagement
- Kickstart lever movement
- Difficult starting
- Abnormal noises
Lambretta Kickstart Shaft
The kickstart shaft transfers the movement from the kickstart lever into the engine.
The splines and shaft should be inspected whenever the engine is dismantled.
Look for:
- Worn splines
- Damaged threads
- Excessive play
- Corrosion
- Bending
- Damage to the kickstart mechanism
If the kickstart lever repeatedly moves on the shaft, check the splines rather than simply tightening the lever further.
Lambretta Kickstart Lever
The kickstart lever needs to securely engage with the kickstart shaft.
Scooter Vista stocks the MB Scooters Series 3 LI, SX, TV, DL & GP adjustable kickstart lever.
The adjustable stop allows the lever to be repositioned where the splines are slightly out of position, helping achieve a better lever position. It is suitable for Series 3, SX, TV and DL/GP applications.
A replacement kickstart lever can also be useful when the original is damaged, worn or has poor spline engagement.
Lambretta Kickstart Piston
The kickstart piston is an important part of the external kickstart mechanism.
Scooter Vista stocks an MB Scooters Lambretta LI, SX, TV, DL & GP external kickstart piston pin.
The pin helps spread the kickstart load and provides correct operation within the external kickstart mechanism.
When rebuilding a kickstart mechanism, inspect the piston and pin for wear and damage.
Lambretta Kickstart Problems
Kickstart slips
Possible causes include:
- Worn kickstart mechanism
- Damaged kickstart gear
- Worn kickstart piston
- Internal gearbox problems
Kickstart lever moves on the shaft
Possible causes include:
- Worn splines
- Damaged lever
- Incorrectly fitted lever
Kickstart doesn't return
Possible causes include:
- Weak or broken spring
- Binding mechanism
- Damaged components
- Incorrect assembly
Kickstart is difficult to operate
Possible causes include:
- Internal damage
- Incorrect assembly
- Lack of lubrication
- Worn components
Lambretta Kickstart Lever Position
Correct kickstart lever positioning is important.
The lever should provide enough movement to turn the engine effectively while being positioned comfortably for the rider.
If the original splines no longer allow the ideal position, an adjustable kickstart lever can provide additional flexibility.
However, badly worn splines should not simply be compensated for by changing the lever position.
Inspect the shaft and lever carefully.
Lambretta Gear Cables & Gear Selection
The gearbox is operated from the handlebar through the gear control and cables.
Even a perfectly rebuilt gearbox will not select gears correctly if the cables are poorly adjusted.
After installing or rebuilding a gearbox:
- Check cable routing.
- Check cable condition.
- Check cable adjustment.
- Check the selector moves correctly.
- Check neutral position.
- Check all gears can be selected.
- Confirm the cables are not binding.
Correct cable adjustment should be carried out after the engine and gearbox have been correctly assembled.
Lambretta Gear Selector Adjustment
If the gears are difficult to select, don't immediately assume that the gearbox needs dismantling.
First check:
- Gear cables
- Cable routing
- Cable tension
- Gear selector position
- Handlebar gear control
- Selector movement
If correct adjustment does not solve the problem, the gearbox itself may need investigation.
Lambretta Gearbox Maintenance
Regular gearbox maintenance can help identify problems before they become serious.
During servicing:
- Check gearbox oil level.
- Look for leaks.
- Check gear selection.
- Listen for unusual noises.
- Check for excessive selector movement.
- Inspect the kickstart mechanism.
- Check the gear cables.
- Investigate any gear jumping.
A gearbox that is becoming noisy or difficult to operate should be inspected rather than ignored.
Lambretta Gearbox & Kickstart Engine Rebuild
If you're completely rebuilding a Lambretta engine, the gearbox and kickstart mechanism should be inspected alongside the crankshaft, clutch and top-end components.
A typical rebuild can include:
Gearbox
- Gearbox gears
- Cluster
- Selector
- Selector rod
- Shims
- Bearings
- Oil seals
- Circlips
- Nuts and washers
Kickstart
- Kickstart shaft
- Kickstart piston
- Piston pin
- Kickstart gear
- Kickstart spring
- Kickstart lever
Final Drive
- Front sprocket
- Crown wheel
- Chain
- Chain tensioner
- Chain guides
Inspecting these components together gives you a much better chance of building a reliable engine.
Lambretta Gearbox Parts for Standard & Performance Engines
Scooter Vista stocks gearbox and kickstart components suitable for both standard Lambretta restorations and performance engine builds.
Our range includes components from specialist suppliers such as:
- Scootopia
- MB Scooters
- AF Rayspeed
- MEC EUR
- Other specialist Lambretta manufacturers
This allows you to choose components based on the specification and intended use of your engine.
Choosing the Correct Lambretta Gearbox Part
Before ordering a gearbox component, check:
Lambretta model
Series
Engine capacity
Gearbox type
Standard or modified gearbox
Standard or performance engine
Existing gearing
Component dimensions
This is particularly important with gearbox gears, selectors, shims, sprockets and kickstart components.
Parts that look similar can have different specifications.
Choosing the Correct Lambretta Kickstart Part
Before ordering a kickstart component, check:
- Lambretta model
- Series
- Kickstart mechanism
- Shaft specification
- Lever spline
- Standard or performance setup
For modified scooters, always check the actual components fitted to the scooter rather than relying solely on the model year.
Lambretta Gearbox & Kickstart Parts at Scooter Vista
Whether you're rebuilding a Series 1, Series 2 or Series 3 gearbox, restoring an SX or TV, maintaining a DL or GP, or building a performance Lambretta engine, Scooter Vista aims to supply the components required.
Our Lambretta gearbox and kickstart range includes:
- Gearbox gears
- Gearbox clusters
- Gear selectors
- Selector components
- Gearbox shims
- Gearbox bearings
- Gearbox oil seals
- Front sprockets
- Crown wheels
- Kickstart shafts
- Kickstart pistons
- Kickstart pins
- Kickstart springs
- Kickstart levers
- Gearbox hardware
- Associated engine components
From a small gearbox shim to a complete kickstart component, using the correct part and setting the gearbox up correctly can make a huge difference to the reliability and riding experience of your Lambretta.
Scooter Vista – Classic Lambretta & Vespa Parts Specialists
Scooter Vista specialises in classic Lambretta and Vespa parts, supplying components for restoration, servicing, engine rebuilding and performance upgrades.
Browse our range of Lambretta LI, SX, TV, DL & GP Gearbox & Kickstart Parts to find the components you need for your next engine rebuild or repair.
