Welcome to CVT Tuning ⚙️
This section is for tuning your launch, midrange, and top speed using CVT setup — variator weights, springs, clutch, belt, and gearing.

Post here for:

• Roller vs slider weight questions

• Contra/torque spring tuning

• Clutch spring tuning + engagement RPM

• Variators, drive faces, belt sizing

• Slipping belts, glazing, heat issues

• “It revs but doesn’t move” / “falls on its face” CVT problems

• Finding the right RPM for your powerband

✅ CVT TUNING TEMPLATE (Copy/Paste)

Fill this out in your post for the fastest help:

1) Scooter + Engine

• Year / Make / Model:

• Engine type: 2T / 4T / GY6:

• Displacement (50/70/125/150/etc):

• Current power mods: (pipe, BBK, cam, carb, etc)

2) Current CVT Setup

• Variator brand/model:

• Roller/slider weight (grams):

• Contra/torque spring (stock / 1k / 1.5k / 2k / color/brand):

• Clutch springs (stock / 1k / 1.5k / 2k / color/brand):

• Clutch brand/model:

• Belt brand + size (if known):

• Final drive / gears (if changed):

3) What you’re trying to fix or achieve

• Goal: (better launch / better mid / more top / hill climb / lower temps / less slip)

• Current top speed (GPS if possible):

• Current max RPM at WOT:

• RPM at takeoff:

• RPM cruising:

4) Symptoms

• Over-revving? (yes/no)

• Bogging/low RPM under load? (yes/no)

• Belt slip/burning smell? (yes/no)

• Shudder on takeoff? (yes/no)

• Flat spot at a certain speed? (yes/no)

5) Environment (helps more than people think)

• Rider weight (approx):

• Tire size (if not stock):

• Terrain: flat / hills:

• Altitude (optional):

Quick CVT “rules of thumb” (not universal, but helpful)

• Heavier weights usually lower RPM / can increase top speed if you have the power.

• Lighter weights usually raise RPM / can improve acceleration but can over-rev.

• Stiffer contra spring helps belt grip and backshift, but can reduce top speed if too stiff.

• Stiffer clutch springs raise engagement RPM (launch harder), but too stiff can feel “slippy” in traffic.

Post your setup + goal using the template above and we’ll help you dial it in 🤝