The Yamaha RX100 is a legend in the world of motorcycles. Known for its lightweight frame, peppy two-stroke engine, and iconic exhaust note, it remains a favorite among bike enthusiasts even decades after its discontinuation.
If you own an RX100 and want to enhance its performance, aesthetics, or comfort, modifications are the way to go. This guide covers the best Yamaha RX100 modifications, including performance upgrades, cosmetic changes, and essential safety improvements.
1. Performance Upgrades for Yamaha RX100
The RX100 was already a power-packed machine, but with the right modifications, you can take its performance to the next level.
A. Expansion Chamber Exhaust
🔹 The stock exhaust of the RX100 is great, but an expansion chamber can improve power delivery, acceleration, and the signature two-stroke sound.
🔹 Popular options: Yamaha RD-style expansion chambers
B. Carburetor Upgrade
🔹 Upgrading to a larger Mikuni or Keihin carburetor improves fuel-air mixture and increases power.
🔹 A 24mm or 26mm carburetor works well for tuned RX100s.
C. Performance Air Filter
🔹 A high-flow air filter like K&N or UNI improves airflow, leading to better combustion and throttle response.
🔹 Works best when combined with a rejetted carburetor.
D. Porting & Polishing the Engine
🔹 Porting the engine enhances airflow, resulting in better acceleration and top speed.
🔹 A mild porting job can add 10-15% more power.
E. Bore Kit Upgrade (For Racing Enthusiasts)
🔹 Increasing the bore size from 98cc to 110cc or 120cc boosts power output.
🔹 Keep in mind, this modification may reduce engine life and affect fuel efficiency.
F. 5-Speed Gearbox Conversion
🔹 The RX100 originally came with a 4-speed gearbox, but many riders upgrade to a 5-speed RX135 transmission for smoother power delivery and better fuel economy.
2. Safety & Handling Improvements
Since the RX100 was built for performance, not safety, upgrading its braking and suspension system is crucial.
A. Front Disc Brake Upgrade
🔹 The stock drum brakes lack stopping power.
🔹 Install a Yamaha FZ or Pulsar front disc brake system for better control.
B. Rear Suspension Upgrade
🔹 Replace the stock rear shocks with gas-charged shocks (e.g., YSS or Gabriel).
🔹 Improves comfort and stability, especially on rough roads.
C. Wider Tires for Better Grip
🔹 Stock RX100 tires are narrow, making handling tricky.
🔹 Upgrade to 100/90-18 or 110/80-18 tires for improved road grip.
D. LED Headlights & Indicators
🔹 The stock halogen bulbs are dim, especially at night.
🔹 Install LED headlights and indicators for better visibility and modern styling.
3. Cosmetic & Aesthetic Modifications
If you want to give your RX100 a fresh, stylish look, these modifications will make it stand out.
A. Custom Paint Jobs & Decals
🔹 A two-tone or metallic paint job gives the bike a premium look.
🔹 Vintage Yamaha RX100 decals enhance authenticity.
B. Chrome Plating & Polishing
🔹 Restoring the chrome finish on the exhaust, rims, and handlebar enhances the classic appeal.
C. Cafe Racer or Scrambler Conversion
🔹 Turn your RX100 into a cafe racer or scrambler with a custom seat, handlebar, and minimalistic design.
🔹 Clip-on handlebars and a single-seat conversion add a retro racing look.
D. Digital Speedometer & Tachometer
🔹 Install a digital meter cluster for a modern touch while retaining the bike’s vintage appeal.
E. Bar-End Mirrors & Handlebar Grips
🔹 Classic bar-end mirrors give the RX100 a vintage European look.
🔹 Upgraded rubber grips improve comfort for long rides.
4. Legal Considerations for RX100 Modifications
While modifying your RX100 is exciting, some changes may be illegal in India. Here’s what you need to know:
✅ Allowed Modifications:
✔ Paint jobs (but RC book must be updated)
✔ LED lights and indicators
✔ Exhaust system (as long as noise levels are within limits)
✔ Safety upgrades (disc brakes, suspension)
🚫 Illegal Modifications (as per Indian RTO rules):
❌ Engine displacement increase beyond the original 98cc
❌ Extremely loud exhausts (above 80 dB)
❌ Structural changes (chopping the frame)
⚠️ Pro Tip: Always check with the local RTO before making major modifications.
FAQs About Yamaha RX100 Modifications
1. Can I modify my RX100 without affecting its resale value?
Yes! Modifications like brake upgrades, suspension improvements, and LED lights won’t harm resale value. However, engine modifications or excessive cosmetic changes may reduce originality, affecting resale price.
2. What is the best performance upgrade for RX100?
The best upgrades include expansion chamber exhaust, bigger carburetor, and porting the engine. These will significantly improve acceleration and top speed.
3. Can I install a disc brake on the RX100?
Yes, you can install a Yamaha FZ or Bajaj Pulsar front disc brake for better stopping power.
4. Will modifying my RX100 affect its mileage?
Yes, performance mods like bigger carburetors, porting, and expansion chambers can reduce mileage. However, proper tuning can balance power and fuel efficiency.
5. Can I legally ride an RX100 with modifications?
It depends on the modifications. Engine swaps, loud exhausts, and frame alterations are illegal in many states. However, LED lights, better brakes, and suspension upgrades are allowed.
6. What is the cost of modifying a Yamaha RX100?
| Modification | Estimated Cost (₹) |
|---|---|
| Expansion Chamber Exhaust | ₹4,000 – ₹10,000 |
| Performance Carburetor | ₹2,000 – ₹5,000 |
| Porting & Polishing | ₹3,000 – ₹7,000 |
| Front Disc Brake Kit | ₹5,000 – ₹12,000 |
| Rear Gas Suspension | ₹3,500 – ₹8,000 |
| LED Headlights & Indicators | ₹2,000 – ₹5,000 |
| Custom Paint Job | ₹8,000 – ₹20,000 |
| Cafe Racer Conversion | ₹15,000 – ₹50,000 |
7. Can I restore my RX100 to its original condition?
Yes! Many workshops specialize in full RX100 restorations, sourcing original parts and restoring factory paint jobs.
Final Thoughts: Should You Modify Your RX100?
Modifying a Yamaha RX100 can enhance its performance, looks, and comfort, making it even more exciting to ride. Whether you prefer a classic restoration, a street racer look, or a cafe racer conversion, there are countless ways to upgrade your RX100.
⚡ Which modification do you like the most? Let us know in the comments below! 🏍🔥
