Author Topic: DR500 valve clearances  (Read 2248 times)

0 Members and 1 Guest are viewing this topic.

Offline steve234

  • Legend
  • *****
  • Posts: 897
    • View Profile
DR500 valve clearances
« on: July 14, 2009, 10:32:59 AM »
Does anyone know what the valve clearances are supposed to be. Can any gains be made by different adjustments?

Bultaco M106 Astro
Wanted: Dirt track bikes / parts / info


  • Guest
Re: DR500 valve clearances
« Reply #1 on: July 14, 2009, 04:41:10 PM »
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 )