If you can get feeler gauges in go for it..... cold setting IN & EX  0.08 - 0.13 
This need to be done with mag cover off 
Rotate mag until  T  is aligned with hole on crank case 
Dial in your cam  inlet opens  28 degrees BTDC           inlet close  64 degrees ABDC
                       Exhaust opens 68 degrees  BBDC      Exhaust close  24 degrees ATDC
  *  TDC = Top Dead Centre        B= Before    A = After 
      BDC = Bottom Dead Center  
 
While your at it  - adjust Balance chain   ....remove sprocket cover and mag cover ( mag runs in oil ) so drain oil 
Adjuster is below mag and above bottom engine bolt ( internal )