Basic CVT Testing

For unknown cvt and engine set ups we recommend using this process for the very most basic cvt tuning process

SUPPLIES

• Tachometer for 2 Stroke Engine (see tach)
• Marker
• Assortment of roller weights

 PROCESS 

• install a new torque spring that is in the general range of engine power (best to ride atv for about 7-10 minutes to break the spring in if new and then let it cool before testing begins)
• Install tachometer to monitor rpms
• Start with lightest rollers in front variator
• Mark the front pulley/variator with a marker from the center out like a pinwheel (as the belt rises in the front it will remove the marker showing how high the belt went up)
• Run the atv about 200’ and check results
• You are looking for max rpms on the tach and how much marker is left on the front variator
• You can make the run 2-3 times per roller weight change so you can verify an avg for the results
• Add a little heavier weight and repeat

 

If you started with light enough rollers you should see initial tests resulting in higher rpms but a lot of marker left on the front pulley

 

As you add roller weight (in .25 gram increments alternating 3 or replacing all 6) you  should see the rpms drop/stabilize and the belt will go higher results in removing more marker

 

At some point you will lose rpms and belt travel as the roller weights get too heavy for the engines power

 

Once this happens go back to a lighter roller weight (1 or 2 steps lighter based on usage and race length time)

 

Ex) 45-60 minutes would race might require a little less roller weight vs MX race usage

 

**** IMPORTANT THINGS TO CONSIDER ****

 

• Using a conservative sprocket - tire - wheel set up is recommended
• A leak down and compresses  test is recommended to ensure engine integrity and health BEFORE testing