Page 1 of 2 1 2 LastLast
Results 1 to 10 of 16

Thread: Head mill

  1. #1
    johnboygtv's Avatar
    Join Date
    Jul 2008
    Location
    England
    Posts
    44

    Question Head mill

    Hi guys
    im thinking about getting my stock head skimmed but i dont want to go crazy! Ive got a guy who can do the work.i just need the best specs,you guys think i will need?
    Any help would be great!!
    Regards john


  2. #2

    Join Date
    Mar 2006
    Posts
    1,833
    +1
    119
    I had my machinist mill the lip off my stock head-- it was about .015". Worked great on my ski -- BACK IN THE DAY-- I ran Premium pump gas for 100+ hours without failure. Cost was $40.

  3. #3
    dghal's Avatar
    Join Date
    Jul 2008
    Location
    League City Texas
    Posts
    280
    what is the desired goal here?

    are you using aftermarket pipe? different reeds/rotary? Carbs? Flame arrestors? any porting changes?

    Usually you do things ------with other things------- to accomplish -------a desired end result,

    Milling the head with change the compression, a need for better octane fuel. you need to reset the squish once the head is cut and usually CC the combustion chamber.

    Might be some benefit, I would install new rings at the same time you do this, and measure the bores to make sure they are in spec....

    Post back

  4. #4
    johnboygtv's Avatar
    Join Date
    Jul 2008
    Location
    England
    Posts
    44
    Cheers guy's for the reply's

    sorry i didnt give you more info, it's a 787 engine,ive put an r&d f/a with rejet and r&d 85-88 nozzles that's it.i just want a little more compression,but not to much. the ski run's great!!

    so jim you didnt cut the squish??

    regards john

  5. #5
    96XPSS's Avatar
    Join Date
    Feb 2006
    Location
    Warner Robins, GA Home of the 2007 All-Star Little League World Champions!
    Posts
    4,361
    I'd get the PPG head mill...best bang for the buck. Better than any aftermarket (except Mel Miller's heads) and screams. Mine is 180+ @ .050" squish.

  6. #6
    johnboygtv's Avatar
    Join Date
    Jul 2008
    Location
    England
    Posts
    44
    Quote Originally Posted by 96XPSS View Post
    I'd get the PPG head mill...best bang for the buck. Better than any aftermarket (except Mel Miller's heads) and screams. Mine is 180+ @ .050" squish.
    Hi chap

    the trouble is, im in the uk,so would have to ship it out

  7. #7
    96XPSS's Avatar
    Join Date
    Feb 2006
    Location
    Warner Robins, GA Home of the 2007 All-Star Little League World Champions!
    Posts
    4,361
    Why don't you email Glen and see if he has one to mill? Then you only have to pay shipping one way? Or, there are many buds on here that have salvage parts in the US that could ship one to him.

  8. #8
    johnboygtv's Avatar
    Join Date
    Jul 2008
    Location
    England
    Posts
    44
    Quote Originally Posted by 96XPSS View Post
    Why don't you email Glen and see if he has one to mill? Then you only have to pay shipping one way? Or, there are many buds on here that have salvage parts in the US that could ship one to him.
    cheers for the info! Will i need a base gasket? As i dont really want to strip the engine just yet! Or can i just put the milled head straight on? Sorry if this is a stupid
    question lol
    regards john

  9. #9
    96XPSS's Avatar
    Join Date
    Feb 2006
    Location
    Warner Robins, GA Home of the 2007 All-Star Little League World Champions!
    Posts
    4,361
    No gaskets needed John. You will reuse the cylinder orings, just wipe the excess oil off with a cotton rag, leave in the grooves, and set the new head on top. The headshell will be the same, and you reuse the oring for that too. All you take off are the top bolts on the head, and sensor wire, and the three hoses.

    Robert

  10. #10
    johnboygtv's Avatar
    Join Date
    Jul 2008
    Location
    England
    Posts
    44
    Quote Originally Posted by 96XPSS View Post
    No gaskets needed John. You will reuse the cylinder orings, just wipe the excess oil off with a cotton rag, leave in the grooves, and set the new head on top. The headshell will be the same, and you reuse the oring for that too. All you take off are the top bolts on the head, and sensor wire, and the three hoses.

    Robert
    Hi Robert
    great i just wanted to make sure,the spec's im going to use are in this,can you please have a quick look at page 63 and 65,
    cheer's for your help yet again
    john
    http://seadoomanuals.net/download/pd...acing-book.PDF

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. stock head milling
    By 2004 xlt1200 in forum Yamaha PWC Performance (2-stroke)
    Replies: 8
    Last Post: 07-03-2009, 10:20 AM
  2. stock head milling ?
    By steven1300r in forum Yamaha Open Discussion
    Replies: 31
    Last Post: 12-17-2008, 09:23 PM
  3. OEM head milling compression results
    By night022 in forum Yamaha PWC Performance (2-stroke)
    Replies: 5
    Last Post: 09-18-2008, 07:00 PM
  4. stock 951 head milling? how much?
    By 1fastrat in forum 2-Stroke Performance
    Replies: 12
    Last Post: 08-26-2008, 07:10 PM
  5. head mill???
    By PAINKILLER in forum 4-Tec Performance
    Replies: 3
    Last Post: 02-15-2006, 07:45 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •