If you’re a motorcycle enthusiast, especially a fan of classic two-stroke bikes, the term “escapamento RD” is likely familiar. Whether you’re restoring a vintage Yamaha RD or looking to optimize its performance. Upgrading or understanding the exhaust system is a game-changer. In this guide, we’ll break down everything you need to know about escapamento RD—from its function and types to tuning tips. Best practices, and buying guides.
This comprehensive article is built to serve as your go-to reference. Aligning with Google’s helpful content update by offering expert. Experience-based, and trustworthy advice on this critical component of the RD series.
What is Escapamento RD?
Escapamento RD refers to the exhaust system specifically designed for the Yamaha RD series of motorcycles. “Escapamento” is the Portuguese word for exhaust, and “RD” stands for Race Developed. Which is the lineage of Yamaha’s legendary two-stroke motorcycles like the RD125, RD350, RD400, and RD500.
The exhaust in a two-stroke engine does more than just channel out gases. It directly impacts performance, power delivery, and engine sound. Therefore, choosing the right escapamento for your RD is essential for both performance enthusiasts and vintage restorers.
Why the Escapamento Matters in Two-Stroke Engines
Unlike four-stroke engines, two-stroke motors use the exhaust system as an integral part of their combustion cycle. Here’s why the escapamento RD is crucial:
1. Powerband Optimization
Two-stroke exhausts use expansion chambers to create backpressure that helps scavenge the engine. Pulling in more air-fuel mixture and pushing out exhaust gases efficiently. This process enhances power in a specific RPM range, creating the famed “two-stroke powerband.”
2. Tuning Potential
A stock RD exhaust is often built for emissions and noise control. Aftermarket or performance escapamentos can significantly increase horsepower, especially when tuned correctly with carburetor jetting and ignition timing.
3. Sound & Style
The unmistakable crisp, high-pitched sound of a two-stroke RD is part of its charm. Performance exhausts often amplify this, making the ride more thrilling and nostalgic.
Popular Yamaha RD Models & Their Escapamento Characteristics
Understanding the different RD models helps determine the correct exhaust setup:
Yamaha 125
- Entry-level twin-cylinder two-stroke.
- Lighter exhausts enhance torque in mid-range RPMs.
- Best paired with mild expansion chambers.
Yamaha RD350
- Legendary power-to-weight ratio.
- Highly tunable; aftermarket exhausts can increase power by 20–30%.
- Classic “coffin tank” look often complemented by chrome or black twin pipes.
Yamaha 400
- Evolved from the 350 with smoother power delivery.
- More torque-oriented, requiring differently tuned chambers.
Yamaha RD500
- V4 engine; complex exhaust setup.
- Each cylinder requires its own expansion chamber.
- High-performance options offer serious gains, often used in racing setups.
Types of Escapamento RD Systems
When upgrading or replacing your Yamaha RD exhaust, you’ll encounter various types. Here’s a breakdown:
1. Stock Exhaust Systems
- Original manufacturer parts (OEM).
- Focus on reliability and compliance with noise/emission standards.
- Limited performance potential.
2. Aftermarket Performance Exhausts
- Brands like Toomey, JL (Jim Lomas), Jolly Moto, and Spec II specialize in RD exhausts.
- Designed for high-RPM power gains.
- Lightweight materials like aluminum and stainless steel.
- Custom expansion chamber designs.
3. Handmade or Custom-Built Escapamentos
- Popular in Brazil and other RD-loving countries.
- Welded to spec based on rider needs.
- Often tuned for street or drag racing.
4. Chamber Exhausts
- Most common in RD350 and RD400 upgrades.
- Known for the “bulge” (expansion chamber) in the pipe.
- Optimizes powerband in higher RPMs.
Choosing the Right Escapamento RD for Your Riding Style
Your riding habits should dictate your choice:
| Riding Type | Recommended Escapamento Type | Key Benefits |
|---|---|---|
| Daily Street Use | Mild aftermarket chambers | Better midrange, moderate noise |
| Track/Race | High-performance chamber systems | Maximum top-end power |
| Restoration | OEM or replica stock exhausts | Authentic look and sound |
| Custom Builds | Handmade tuned pipes | Performance tailored to engine |
Performance Gains: What to Expect from an Upgraded Escapamento RD
✅ Horsepower Boost
A properly tuned performance exhaust on an RD350 can add 5 to 12 HP. Depending on the setup and other modifications like porting and carb upgrades.
✅ Weight Reduction
Aftermarket exhausts can reduce weight by up to 5–8 kg, improving handling.
✅ Improved Throttle Response
Due to better scavenging and backpressure optimization.
✅ Enhanced Engine Sound
That iconic two-stroke “crack” gets louder and sharper, especially with open-chamber pipes.
Installation Tips: How to Install an Escapamento RD
Installing a new escapamento RD isn’t overly complex but requires attention to detail.
Tools Needed:
- Wrenches (metric)
- Torque wrench
- Gasket scraper
- New gaskets and sealant
- Anti-seize compound
Step-by-Step Installation:
- Remove Old Exhaust
- Unbolt from cylinder head and frame mounts.
- Carefully remove gaskets and clean the ports.
- Check Port Alignment
- Ensure the new exhaust flange matches the cylinder exhaust port.
- Install New Gaskets
- Use high-quality gaskets to prevent leaks.
- Mount the New Exhaust
- Hand-tighten bolts first, then torque to spec.
- Apply anti-seize to prevent future rusting.
- Check for Leaks
- Start the engine and inspect for exhaust leaks around the ports and joints.
- Rejet the Carburetors
- Most performance exhausts require upjetting to prevent a lean air/fuel mixture.
Tuning & Jetting for Escapamento RD
When you change the exhaust, you must retune the carburetors to match the new flow characteristics.
Signs You Need to Rejet:
- Engine bogs or sputters at high RPM.
- Excessive smoke or plug fouling.
- Engine runs lean and overheats.
Basic Jetting Guidelines:
| Engine | Stock Jet | With Performance Pipe |
|---|---|---|
| RD125 | 110–115 | 120–125 |
| RD350 | 170–180 | 190–210 |
Tip: Always start with a richer jet and work down to prevent engine damage.
Legal Considerations & Noise Regulations
In many regions (especially in Europe and Brazil), using non-approved exhaust systems can result in fines or failed inspections.
- Brazil: Certain cities enforce decibel limits.
- Europe: Use E-marked or homologated systems.
- USA: Less stringent in most states, but check local regulations.
Always verify if the chosen escapamento RD is street-legal in your location.
Top Brands for Escapamento RD
Here are some of the most respected brands in the RD aftermarket world:
🔧 Toomey Racing RZ350
- Known for RD350 and RZ350 systems.
- Excellent top-end power.
🔧 JL (Jim Lomas)
- High-quality stainless pipes.
- Perfect for RD restorations and street use.
🔧 Jolly Moto
- Italian-made racing exhausts.
- Optimized for track use.
🔧 Spec II
- US-based with excellent reputation.
- Custom tuning available.
Where to Buy Escapamento RD
🔍 Online Retailers
- eBay Motors: Great for used OEM and rare vintage parts.
- Wemoto: Trusted for aftermarket motorcycle parts.
- FortNine (Canada): Sometimes stocks vintage components.
🇧🇷 Brazilian Market
- Local artisans often handcraft escapamentos.
- Facebook Groups and OLX Brazil are popular platforms.
- Look for weld quality, reviews, and tuning advice.
Conclusion: Should You Upgrade Your Escapamento RD?
Upgrading or restoring your escapamento RD is one of the most impactful changes you can make to your Yamaha RD motorcycle. Whether you’re seeking better performance, a vintage-correct restoration. Or simply want to enjoy the symphony of a well-tuned two-stroke engine, investing in the right exhaust system pays dividends.
Make sure to select a system suited for your engine size and riding style, and always tune your carburetors accordingly. With the right setup, your RD can roar back to life like the race-bred machine it was meant to be.
FAQs About Escapamento RD
❓ Can I use a universal exhaust on a Yamaha RD?
Technically yes, but you’ll lose performance if the expansion chamber isn’t tuned for your engine’s characteristics.
❓ How much does a good escapamento RD cost?
Anywhere from $200 to $800 USD depending on brand, materials, and design.
❓ Do I need to rejet if I upgrade my exhaust?
Absolutely. Not rejetting can cause your engine to run lean, which may lead to engine damage.
❓ Is a louder RD exhaust legal?
Check your local noise ordinances. Some pipes may exceed acceptable decibel levels.
