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  1. #1
    Moderator OsideBill's Avatar
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    1390 66V Heads CNC machined 150 and 155 PSI

    I have for sale a Yamaha 66V GP1390R CNC Machined Cylinder Head.
    The head has been decked and the squish band cut and blended into the dome to achieve 39cc, this will give approximately 155-160 psi compression and can be run on 91 octane pump gas. Compression will vary depending on whether you have had your cylinders decked or not and the age and wear on your rings and cylinders.
    I also have available a New OEM Yamaha 66V Head Gasket, machined to 87mm for an additional $85.
    The squish band width, angle, depth and radius was computer designed by Lowell Horning using TSR software. www.2-stroke-porting.com
    This head will work on a Lowell, Woody (West Coast Porting), GroupK or any 66V/66E cylinder bored out to 87mm/1390cc motor.
    Every head is cut and measured on the CNC machine to achieve the desired size and cc volume.
    I will take your head in for core exchange, head must be in good useable condition up to $75 in exchange for a non damaged head.


    Parts for sale on ebay as well.
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    Last edited by OsideBill; 06-09-2012 at 08:23 AM.


  2. #2
    Moderator OsideBill's Avatar
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    I also have a 40CC head which will give you 150-155 PSI
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  3. #3
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