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  1. #1
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Help me build the best 250x motor on a budget

    Hey guys if you have been following my build in the projects section then you know whats up but if not here is a refresher

    2005 stx15f not running for it for $500
    250x pump
    r&d rideplate, intake grate, sponsons
    renthal handlebars
    stx900 steering stem (the shorter one)
    riva throttle
    ferrea valves with a full port and polish along with some runner work
    secondary waterbox bypass
    250x pistons (thanks Jwilson )

    and that's about where it stands, now i need to get the 250 or 260 ecu and some form of compressor, fuel pump and some subaru injectors,
    what does everyone think as far as this goes, should i change anything? is there anything i should keep an eye out for? and is there any specific charger i should look for?

    at the moment it is looking like a turbo will be simpler because all i need is pipe and an intercooler and i dont have to worry about belts...

    what do yall think?

    thanks

    Sean

    I am planning on getting aftermarket piston rings, does that mean i wont have the gio issue?

    Sean


  2. #2
    dawson's Avatar
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    are you going to put 250 pistons into a 15f engine ???
    can you explain your engine build me i am just a slow aussie

  3. #3
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Im planning on using the 250x pistons to lower the compression so i can supercharge or turbocharge it

    Sean

  4. #4
    dawson's Avatar
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    what about the pin height difference ?
    a 250 cylinder is a differnt hieght than a 15f to compensate for the pin height diference
    am i missing some thing
    it like 5mm taller from what i have been told
    not many parts are interchanable between the 15 and the 250 when you get down to the nitty gritty

  5. #5
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    i didnt know that it was that much, i guess ill just check for interferance and then do the compression ratio when i get the pistons.

    Sean

  6. #6
    dawson's Avatar
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    i am only going what other people have told me mate i could be 100% wrong
    when you get them could you do a pin to pin and post a pic

  7. #7
    www.eastcoastpwc.net Scott's Avatar
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  8. #8
    hudsta's Avatar
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    i was wondering where to get upgrade valve kits from (good link ), what is the benefit of those ferrea valves over stock ?
    are there any titanium sets available at all ?

  9. #9
    dawson's Avatar
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    Quote Originally Posted by hudsta View Post
    i was wondering where to get upgrade valve kits from (good link ), what is the benefit of those ferrea valves over stock ?
    are there any titanium sets available at all ?
    in the exhuast valves it is a step back wards fom the stock valves as ferrea, ape, black diamond and most other valves are not inconell grade stainless.

    the inlets are a step forward as the stock kawi ones are not a stainless valve

    only benifit then is the rust factor and cost over OEM

    Ferrea will make inconell stainless valves custome for the 250 engine but at the same cost as the oem kawi valve

  10. #10

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    Get black diamond BR goes way up.
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