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  1. #1

    New (to me) R and D heads. Need help tuning.

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    I just got some used heads to replace my torn up ones. They came with the girdle kit and instructions but it does not have and specs for tuning.

    My ski right now is gp1200r
    No air box
    D plate
    Oside bills specs, accel pump removed, return drilled.

    Do I need to rejet and what octane should I run? I don't know the ccs or compression on these heads. Can anyone tell from the pics?


    I have read a few threads about people burning pistons in a hurry when fitting new heads.


  2. #2
    powerstroke specialist mikegp's Avatar
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    these should bring compression up to 150 , you should reject the carbs , i will find and post the values again .
    choose one.


    1200R Aftermarket F/A's chokes intact

      • 110 Pilot jets, 1 turn out on low speed adjusters
      • 120 main jets, 1-1/2 turn out on high speed adjusters
      • 1.5 Needle and Seat, 95 gram spring (Dull Silver) 42-45 avg. pop-off pressure.
    1200R After Market F/A's chokes removed.


      • 110 Pilot jets, 1 turn out on low speed adjusters.
      • 125 Main jets 1-1/2 turn out on high speed adjusters
      • 1.5 Needle and Seat, 95 gram spring (Dull Silver) 42-45 avg. pop-off pressure.

  3. #3
    Ok thanks, what octane should I run?

  4. #4

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    92-93 octane.

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