The CVT cover serves several purposes. Other than the safety feature of keeping fingers and other stuff out of the moving parts, It keeps the cvt system protected from dirt, mud, water ,etc. Get the belt system dirty it's going to fail. Second. it serves as part of the overall motor case integrity. without that case the motor can break in half. With the case bolted up properly it supports the transmission tail from twisting under torque. if you plan to run hard , definitely have that cover in place.
Cooling ? obviously the case traps heat inside and the system will run cooler when exposed to ambient air but the designed cooling features will keep the heat within an acceptable range. If you feel the heat is not acceptable think about adding more vents or modifying the case for more air flow.
This works good, A Howett case with the logo plate cut out. A wire screen basket with a filter element. The Howett case with the removable plate makes the job easier but the same can be done to any case.
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