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Thread: 250r motor finally done

  1. 02-02-2011, 11:42 AM #1
    8586250r's Avatar
    8586250r
    8586250r is offline Registered User New to the board
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    250r motor finally done

    Just got my motor finished its got a trinity pro mx port job, cr head gasket shaven head, fmf fatty and fmf silencer,carbon fiber reeds, reed spacer, wiseco boost ported piston. Is this motor setup good? And Lookin for input on a cool head would i need to use a 17cc dome or less? Or more?
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  2. 02-02-2011, 12:35 PM #2
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    mmartin
    mmartin is offline First Time Rider Arm chair racerNew to the board
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    I just recently completed my motor build also. I cannot say one way or the other as far as which dome you should use but I can say that I have a cool head on mine and also have several different domes. I ended up using my 18cc dome and I ran compression tests and its pumping rite at 218psi. I'm now running leaded 112 octane VP fuel and I am very pleased with the power increase that mine is producing. But as far as headgaskets I stuck with the oem gasket and did not alter it in any way. Also for the most part are mods sound fairly close to being the same with the exception of I used an airbox eliminator and a 39mm PWK carb and a V-Force reed cage. I hope this gives you the info. that your looking for.
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  3. 02-02-2011, 12:53 PM #3
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    ceaserthethird
    ceaserthethird is offline Power User Got the holeshot
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    You'll need to do a compression check see what it's Putting out
    So run the motor get it hot than quickly do a compression check.

    Before anything run race fuel 110 !

    What carb ? Needle number & clip position, main jet , pilot jet ?

    Since u have a shaved head with a CR gasket just try that & see what your getting report back with numbers.
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  4. 02-02-2011, 03:43 PM #4
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    8586250r
    8586250r is offline Registered User New to the board
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    Kehin 34mm carb a cgl needle and is set 2nd slot the main jet is 172 and pilot is 52
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  5. 02-03-2011, 03:40 AM #5
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    Saleenster
    Saleenster is offline At The Back Of The Pack Arm chair racerFirst time rider
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    why people continue to run gaskets on the head is a mystery to me....
    Home of the NW fastest 250R's
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  6. 02-03-2011, 03:42 AM #6
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    NOS_350X
    NOS_350X is offline Trikein' Away Teaching quads a lesson
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    Quote Originally Posted by Saleenster View Post
    why people continue to run gaskets on the head is a mystery to me....
    Because most dont know any better. I got $3 in sealing my head.
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  7. 02-03-2011, 12:12 PM #7
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    ceaserthethird
    ceaserthethird is offline Power User Got the holeshot
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    Main jet & pilot are about right, I would bump the main
    To 185 jet to be safe and break it in.

    You'll need to do a Compression Check, report back with numbers.
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  8. 02-03-2011, 01:56 PM #8
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    8586250r
    8586250r is offline Registered User New to the board
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    Quote Originally Posted by ceaserthethird View Post
    Main jet & pilot are about right, I would bump the main
    To 185 jet to be safe and break it in.

    You'll need to do a Compression Check, report back with numbers.
    Compression is 210psi
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  9. 02-03-2011, 02:12 PM #9
    200XMichigan
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    Quote Originally Posted by Saleenster View Post
    why people continue to run gaskets on the head is a mystery to me....
    What do you use instead?
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  10. 02-03-2011, 07:55 PM #10
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    Saleenster
    Saleenster is offline At The Back Of The Pack Arm chair racerFirst time rider
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    Quote Originally Posted by 200XMichigan View Post
    What do you use instead?
    nothing, O ring the head.
    Home of the NW fastest 250R's
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  11. 02-03-2011, 09:07 PM #11
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    ceaserthethird
    ceaserthethird is offline Power User Got the holeshot
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    Ok, you'll need Race Gas - VP 110 octane

    O - rings are really nice to have, you'll never need a gasket
    Just o-rings.
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