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  1. #1

    Question 1200 37cc head v. 41cc

    Guys,

    Will both R&D heads (cc's) work with premium pump gas?


  2. #2
    Quote Originally Posted by jim mcgreehan View Post
    Guys,

    Will both R&D heads (cc's) work with premium pump gas?

    Any ideas for the 1200 GP/XLT motor?? I don't want to run race gas... .

  3. #3
    pokplalya22's Avatar
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    43cc would be ok for 92 and above octane. I imagine you would be boarderline with 41cc also. 37cc, you would defenitely need race gas.

  4. #4
    Moderator OsideBill's Avatar
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    The 37CC is going to require race gas

  5. #5
    Thanks guys. I'll probably go with the 41cc then for my XLT. (I can't remember which cc R&D head I've got on my 1300.) As an alternative, what do you think about cutting the oem v. 41cc R&D? I know the owner of an engine machine shop close by...should I just tell him to cut it to 41cc with no squish work, etc.? Is the R & D squish modified over stock?

    Sorry for the questions, just trying to decide which is best... .

  6. #6
    pokplalya22's Avatar
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    Check out the ADA billet heads with interchangeable domes also as another option.

    http://www.adaracing.com/personal-wa...t/ya1200rhdkit

  7. #7

    Thumbs up

    Thanks all... .

  8. #8

    Question one last question

    If I do decide to have the head cut (gearing-up for this winter project), is it safe to tell the machinist that whatever thousanth's he mills up the the edge of squish (removing the lip), to mill that same amount from the angled squish band?

    (That, rather than measure oem squish clearance using the solder procedure.) If I'm just concerned about the piston hitting the squish particularly at high R's, it seems this is a more straightforward way of 'calculating' squish clearance-putting squish back to oem while boosting compression. Any concerns, or huge performance losses doing it that way?

  9. #9
    Moderator OsideBill's Avatar
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    squish is what aids in piston cooling getting the squish to .035-.045 is desireable. if you don't know where yo are to begin with it is hard to get there

  10. #10
    Hey Bill, I'm wondering if oem squish is acceptable.

    Thanks.

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