Wet clutch
Check plate thickness, basket, springs and adjustment. Polini plates for the Derbi engine are selected here; the AM6 version is not a substitute.
MV21 selection guide · Derbi D50B0 · 2T LC
Your Senda.
More possibilities.
Keep the 50 cm³ cylinder or build a 75 cm³ Sport engine. Choose an exhaust, intake and clutch specifically for the D50B0 platform.
Senda · pre-Euro 450 → 75 cm³Manual gearbox
Build my setup ↘
DERBI D50B0Start with the correct engine version.
01
Senda has more than one engine
First, confirm D50B0.
This initial selection covers specific Senda versions with the original pre-Euro 4 D50B0 2T LC engine. Older EBE/EBS engines, DRD Pro/Evo, GPR and Euro 4/5 versions require a separate selection. A model name and similar appearance alone are not enough.
Choose the exact model and check the engine.
02
The extent of your planned build
50 to start. 75 for a bigger step.
Match the exhaust to the cylinder: Tecnigas E-NOX EVO for the starter option and Yasuni Cross HM for a larger cylinder. MVT Iron Max is a 75 cm³ kit with a head; the crankshaft must be checked separately.
Prices cover the selected products. Installation, tuning and extra materials are not included. We do not promise power or speed without measurements.
03
Parts that work together
Your D50B0 kit.
A Race engine starts with a plan for all assemblies.
Send your motorcycle model, current cylinder, crankshaft, carburettor and goal. We can then match the exhaust, clutch, gearing and ignition.
Discuss your project with MV21 ↗Before adding to cart
This selection does not confirm the condition of your existing engine. Crankshaft, bearings, required adapters and installation are not included in the price. If you are unsure about connections, send us your selected kit for checking.
In this guide, the 75 cm³ conversion is intended for a closed track. For road use, check approval for the specific vehicle and exhaust; physical fitment is not a substitute.
04
Gearing, clutch and chain
D50B0 drivetrain.
Power reaches the rear wheel through a clutch, six-speed gearbox and chain. A variator, rollers and scooter belt are not used on this engine.
Gearbox
A larger cylinder does not repair worn gears or a worn shift mechanism. Choose gearbox and clutch oil according to the manual for your model.
Final drive ratio
The choice depends on the wheels, intended use and engine power. Taller gearing only helps if the engine can pull it.
Chain and sprocket kit
Pitch, sprocket mounts and chain length must match. The label “D50B0” alone is not enough, so the chain kit is selected for the specific motorcycle.
05
Ignition and spark plug
First, identify your ignition.
The standard ignition does not necessarily need replacing with the cylinder. You need to know its manufacturer, connections and version-specific limitations.
CDI for the specific version
The D50B0 engine name alone does not identify the CDI. Compare the markings on the existing unit, stator and connectors. Euro 4/5 electronics are not included in this initial selection.
The name “sports CDI” does not by itself confirm compatibility or a power increase.
Polini PVL
The manufacturer states that the original electrical system will no longer operate. This is not a simple CDI replacement for a motorcycle that needs to retain its standard lighting. Not added to the kit automatically.
…Checking availability…
View product ↗Choose the plug to match the head.
For the original 50 cm³ head, follow the exact model’s manual. For the MVT 75 head, check the kit instructions for thread diameter, reach, heat range and resistor requirements. Without this check, we do not add one plug code to every kit.
06
Before the first ride
A good setup is also well tuned.
What is included in the MVT Iron Max 75 kit?
Cylinder, matching head, piston, rings, pin, clips and gaskets. Designed for the original crankshaft stroke. MVT permits an original-type crankshaft but recommends the reinforced VI13. Worn crankshafts or bearings must not be assumed ready for increased loads.
Can I keep the airbox?
Yes, if you can provide a Ø46 mm connection and correct position for CP 21. The guide removes the sports filter but does not automatically add an adapter. In both cases, the fuel mixture needs adjusting; we do not offer one universal jet for every kit.
Why do the 50 and 75 cm³ kits use different exhausts?
Tecnigas E-NOX EVO is the starter option for a standard cylinder. Yasuni specifies Cross HM for 65–75 cm³ engines. Displacement is not the only criterion: the connection, mounts and intended engine operating range must also match.
Does this also fit EBE/EBS, DRD Pro or GPR?
We do not confirm fitment by name alone. EBE/EBS is a different engine generation, while DRD Pro/Evo and GPR frames may require different exhaust shapes and mounts. These versions need a separate selection.
What about lubrication and cooling?
Check the oil pump, hoses, carburettor connections and cylinder manufacturer’s requirements. After engine work, bleed the cooling system and check for leaks. Do not choose the oil mixing ratio based on displacement alone.
Another option
If you specifically want 70 cm³.
Naraku V2 70 · Euro 3
Kit with head. Check current availability on the product page; this alternative is not included in the 75 cm³ kit above. Changing the cylinder also requires reviewing the other components.
…Checking availability…
View product ↗More guides to come
Next versions.
Derbi Euro 4Already available in the platform selector aboveAprilia and GileraD50B0 with a different frame selectionOther AM6, Peugeot and GY6 modelsExpanding existing platforms
How was this selection checked?
Exhausts, manifold, reed valves and clutch for 29 Senda D50B versions were checked against the store’s internal fitment finder. MVT IM20 cylinder fitment for D50B0 Euro 3 was checked in the manufacturer’s catalogue; this cylinder is not yet indexed in the store’s model finder. Prices and availability are loaded from the store. Connections and existing modifications must be checked on the motorcycle.
