There are several things that can cause the clutch to slip.

You need to confirm the clutch cable is not too tight - you should have just a bit of slack in the cable....so that when you pull the clutch lever it move a small amount before you feel the tension caused by the clutch springs.  Adjustment can be made at the lever with the adjuster.

What kind of motor oil are you using?  If you are using car oil that states it is "Energy Conserving" - then it likely has friction modifiers that can cause the clutch to slip.  You need to use a motor oil that is compatible with wet clutches....and also one that has 1,200ppm of ZDDP to protect your camshaft and rockers.  We recommend you use Shell Rotella T 15W-40 or Rotella T.

If the clutch is worn enough that there is no "free play" available, then you need to install a shorter clutch rod.  The lever on the right side of the transmission should be somewhere between the 2 index marks cast into the case.

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