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RC Engine SKU: 2952862
OS Speed B21 3.49cc Off-road Racing Engine Exhaust Pipe Set
✓ Precision Quality Inspected • Backed by 30-Day Guarantee
€662,44 USD
Engineering Summary
The OS Speed B21 3.49cc Off-road Racing Engine Exhaust Pipe Set is a RC Engine precision-engineered by Stirlingkit. Features construction machined from metal. Available for $739.99 USD with free worldwide tracked shipping, 30-day returns, and replacement parts support at Stirlingkit.
Free Worldwide Shipping
Free worldwide shipping is available on all orders. Customers are not charged a separate shipping fee.
Estimated delivery: 5–14 business days.
Tracking numbers are emailed within 1–3 business days of order confirmation.
Import duties and applicable taxes are not included and are the customer's responsibility (DAP).
Minimum order value: €350.00. Orders with a merchandise subtotal below €350.00 are not accepted.
Order Kit • Free Worldwide Shipping Ask an Engineer About Compatibility ✓ Free Worldwide Shipping: Tracked air delivery in 5–14 business days.
✓ Missing Parts Guarantee: Free replacement parts dispatched within 7 days.
✓ 30-Day Risk-Free Returns: Full refund on unbuilt kits in original box.
Technical Specifications
7 Verified Parameters| For Ages | 14+ |
|---|---|
| Color | As Shown |
| Material | Metal |
| Product Weight | 353g |
| Package Dimensions | 18 x 12 x 10cm |
| Package Weight | 500g |
| Packing | Box |
Features, Architecture & Package Contents
OS Speed B21 Level 21 3.49cc Off-road Racing Engine Exhaust Pipe Set - ADAM DRAKE Edition
Features:
.Description: Adam Drake is a world-class professional racing driver at the ROAR national championship, one of the best cross-country RACES in the United States. At the age of eight, he started playing RC suvs in the backyard, and at 14, he started racing cars in earnest. He won the 1/8 ROAR Nitro suv title in 2013 and has five ROAR titles to date. Many of his followers around the world supported him on Facebook and Twitter. The o.s. simed B21 ADAM DRAKE Edition, based on his recommendation, redesigned the crankshaft with a stroke change to 16.55mm based on the o.s.simed B2101. Two tungsten hammer specifications have been changed to improve the driving feel. By adjusting the timing of the newly designed cylinder jacket, the special φ6.5 anodized carburetor reducer for off-road racing and the special φ8 anodized carburetor reducer for off-road racing were installed, and the engine was completed to win the large race that met his requirements. An exhaust system with a t-2090sc tuned silencer and an M2004SC (85mm) manifold are also provided
.Features：Designed according to Adam Drake's advice and taste.The engine can be used in both buggy and truck. New design cylinder liner with new porting.New design DLC crankshaft with double tungsten counter weight.New bore x stroke(16.40x16.55mm).carburetor reducers are 6.5mm and 8.0mm.ceramic rear bearing.21J carburetor, the same as OS SPEED spec 2 and spec 3.OS SPEED P3 GOLD plug for better fuel mileage
.Specifications: Displacement: 0.213 cu in (3.49 cc); Bore x Stroke(16.40mm x 16.55mm); Practical rpm: 4,000-42,000rpm; Power Output: 2.65 ps/2.61 hp/34,000rpm; Weight: 353g/12.45oz
.Safety Instruction: The engine is not a toy! Please read the instruction manual to become familiar with the features of the product before operating. Keep yourself and those around you safe. To maintain the best engine performance and longer service life. Incorrect or faulty maintenance can result in damage to the product.
.For Ages: 14+
Specifications:
.Color: As Shown
.Material: Metal
.Product Weight: 353g
.Package Dimensions: 18 x 12 x 10cm
.Package Weight: 500g
.Packing: Box
Package Content:
.1 x Engine + Exhaust Pipe Set
Features:
.Description: Adam Drake is a world-class professional racing driver at the ROAR national championship, one of the best cross-country RACES in the United States. At the age of eight, he started playing RC suvs in the backyard, and at 14, he started racing cars in earnest. He won the 1/8 ROAR Nitro suv title in 2013 and has five ROAR titles to date. Many of his followers around the world supported him on Facebook and Twitter. The o.s. simed B21 ADAM DRAKE Edition, based on his recommendation, redesigned the crankshaft with a stroke change to 16.55mm based on the o.s.simed B2101. Two tungsten hammer specifications have been changed to improve the driving feel. By adjusting the timing of the newly designed cylinder jacket, the special φ6.5 anodized carburetor reducer for off-road racing and the special φ8 anodized carburetor reducer for off-road racing were installed, and the engine was completed to win the large race that met his requirements. An exhaust system with a t-2090sc tuned silencer and an M2004SC (85mm) manifold are also provided
.Features：Designed according to Adam Drake's advice and taste.The engine can be used in both buggy and truck. New design cylinder liner with new porting.New design DLC crankshaft with double tungsten counter weight.New bore x stroke(16.40x16.55mm).carburetor reducers are 6.5mm and 8.0mm.ceramic rear bearing.21J carburetor, the same as OS SPEED spec 2 and spec 3.OS SPEED P3 GOLD plug for better fuel mileage
.Specifications: Displacement: 0.213 cu in (3.49 cc); Bore x Stroke(16.40mm x 16.55mm); Practical rpm: 4,000-42,000rpm; Power Output: 2.65 ps/2.61 hp/34,000rpm; Weight: 353g/12.45oz
.Safety Instruction: The engine is not a toy! Please read the instruction manual to become familiar with the features of the product before operating. Keep yourself and those around you safe. To maintain the best engine performance and longer service life. Incorrect or faulty maintenance can result in damage to the product.
.For Ages: 14+
Specifications:
.Color: As Shown
.Material: Metal
.Product Weight: 353g
.Package Dimensions: 18 x 12 x 10cm
.Package Weight: 500g
.Packing: Box
Package Content:
.1 x Engine + Exhaust Pipe Set
Verified Builder Reviews
Authentic feedback from hobbyists, machinists, and scale model engineers
No written reviews have been submitted for this specific kit yet. Have you built the OS Speed B21 3.49cc Off-road Racing Engine Exhaust Pipe Set? Email service@stirlingkits.com with your bench photos to share your build log.
