Werks B5 Pro II .21 Engine

Designed in the U.S.A
Made in Italy
1702-L Meridian AVE #152 San Jose Ca 95125
Introducing Werks Racing’s new B5-Pro II Off-Road Competition engine! The engineers at Werks Racing have taken our proven B5-Pro engine and gone back to the drawing board to make it even better! The B5-Pro II provides stump pulling power with an aggressive bottom end and strong mid and top end making it ideal for truggy racing or buggy drivers that prefer a high power engine with a lot of bottom end! Taking all of the best features of the B5-Pro and adding even more the new B5-Pro II features:

Revised port timing for improved performance.
“Swiss” ceramic rear bearing for improved reliability and reduced friction.
Double shielded front bearing for improved reliability.
Lightened and epoxy ramped crankshaft allows the engine to spool up faster for improved acceleration and improved fuel economy.
Black anodized crankcase for improved heat dissipation.
Billet rear back plate to reduce weight and create a more rigid case assembly.
Improved carburetor heat shield to improve carburetor consistency and reduce possibility of heat saturation.
Revised carburetor design for easier tuning and improved stability.
Modified crankcase and new super low CG wrap around head design for improved heat dissipation and reduces overall CG of vehicle for improved handling.
O-ring sealed head button for improved sealing and reduces the likely hood of dirt entering engine during routine maintenance.


Stroke: 16.50mm
Bore: 16.30mm
RPM Racing: 3,000-41,000
Output: 2.7hp at 33,000rpm
Sleeve: Five Port, Chrome Plated Brass
Piston: SNS Machined High-Silicon Aluminum Alloy
Connecting Rod: Knife Edged, Double Bushed 7075 T6 Aluminum Alloy
Carburetor: Revised 2010, 2 Needle, Adjustable Venturi, Heat Isolation Sleeve.
Cooling Head: Lightweight, CNC Machined, Super Low CG Wrap Around Case Design

Note: This engine includes a Werks TLP5BT #5 Turbo Glow Plug. The glow plugs recommended for this engine are the Werks Racing TLP5BT #5 and TLP6BT #6. Pipe recommendation is Werks Racing 2013 (WRX6658C) for Truggy use and Werks Racing 2058 (WRX6659C) for Buggy use.