RB Concept TM523 323 .21 3.5cc Nitro RC Engine Traxxas Revo Big Block Swap Kit
RB Concept .21 3.5cc TM523/323 Nitro Engine Conversion Kit, designed for Traxxas Revo RC monster truck big block engine conversions.
This is a quality pre-owned nitro engine in good overall condition, both internally and externally, with smooth bearing rotation and strong compression.
The engine has been carefully inspected following a previous return and no piston locking at Bottom Dead Centre (BDC) has been found.
Ideal for RC enthusiasts looking to upgrade, rebuild or restore a Traxxas Revo nitro-powered monster truck.
Brand: RB Concept / RB Concepts
Model: TM523 / 323
Engine Capacity: .21 / 3.5cc
Engine Type: Nitro / Glow Fuel
Application: Traxxas Revo Big Block Conversion
Product Type: RC Nitro Engine / Conversion Kit
Condition: Good Used Condition
Compression: Strong
Bearings: Smooth Rotation
Carburettor: Slide Movement Checked
Glow Plug: O.S. RP7 Turbo Plug Installed
Running Test: Not Confirmed
RB Concept .21 3.5cc Nitro Engine
Designed for Traxxas Revo big block conversions
Strong Compression
Smooth Engine Bearing Rotation
Good internal and external condition
Appears to have had relatively little use
Carburettor slide moves freely
O.S. RP7 turbo glow plug currently installed
Ideal for nitro RC enthusiasts and engine conversion projects
GOOD USED CONDITION – STRONG COMPRESSION
The engine has been inspected and the following observations have been reported:
Crankshaft rotates smoothly.
Engine bearings feel smooth.
Compression feels strong.
No piston locking at Bottom Dead Centre (BDC).
Carburettor slide movement has been checked.
Internal and external condition appears good.
Engine may require further running-in due to apparently limited previous use.
A video is available demonstrating crankshaft rotation, compression resistance and carburettor slide movement.
This engine was previously purchased and returned following claims that the piston was locking.
Following its return, the engine was inspected again.
The seller confirms that the engine does not lock at Bottom Dead Centre (BDC).
The crankshaft rotates smoothly, with strong compression and no locking observed during the subsequent inspection.
This information is provided for transparency so buyers can make an informed purchasing decision.
An O.S. RP7 Turbo Glow Plug is currently installed to maintain compression during inspection.
A new glow plug of your preferred specification is recommended before starting the engine to help achieve reliable performance.
Intended Application: Traxxas Revo Nitro RC Monster Truck
Suitable for compatible big block conversion projects using the RB Concept TM523/323 engine configuration.
Please check your vehicle's engine mounts, drivetrain, exhaust arrangement, clutch and conversion components before purchasing.
Additional fitting parts or adjustments may be required depending on your particular Traxxas Revo setup.
1 × RB Concept TM523/323 .21 3.5cc Nitro RC Engine
Carburettor as fitted
O.S. RP7 Turbo Glow Plug installed
Conversion components and accessories shown in the photographs
Only the engine, conversion parts and accessories visible in the photographs are included.
This is a used hobby-grade nitro engine.
Mechanical checks have been carried out as described.
No live running test has been confirmed.
Strong compression and smooth rotation do not guarantee future running performance.
Buyers should inspect, install and tune the engine appropriately before use.
Any returns are subject to applicable eBay policies and statutory consumer rights.
An excellent opportunity to purchase an RB Concept .21 big block nitro engine for a Traxxas Revo conversion, with strong compression and smooth mechanical operation.
📸 Please see pictures – pictures are part of the description.