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Help Across motor

Discussion in 'Suzuki 250cc In-line 4's' started by flea, Feb 2, 2020.

  1. flea

    flea Well-Known Member Premium Member Contributing Member

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    answered a add y/day , a 250cc across motor with spares , as have a across , all compleate and running thought might ask about it for spares .. turns out a old bloke (older than me) was going to use it for a project .. was going motor with another spare motor /carbs /stators and a few other things , no rolling stock etc .. the spare head he had modified with the intentions of making a fuel injection motor ...MMMMMM.. intresting .. anyone done simmiler only wants 100 bucks for the lot .. he decided to go with a bandit motor instead ... trouble is 50 bucks fuel return to pick it up and do i really need a spare motor and parts for a bike im doing nothing with (sheds full) but the fuel injections got me thinking ..MMMMMMM .. whats the thoughts
     
  2. flea

    flea Well-Known Member Premium Member Contributing Member

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    sorry should have worded it better , has anyone done/ looked into changing the across from carb to fuel injected .. decided to buy the motor and spares this coming fri but wondering what to look for with this modified head (its seperated to the spare running motor) and what parts may be needed , dont know if will continue on with it or not as more intrested in the running motor but got to admit the curiosity has been stirred but its a matter if worth the effort and $$$
     
  3. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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  4. Jethalter

    Jethalter Active Member Premium Member

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    1990 Suzuki Across + 2004 Dragster 650 + 1971 CB500F + 1975 CB400F - 1978 CB550 + 1985 GT550 + 1982 ct110 mini chopper + 2008 Hyosung GT650P + 1988 Yamaha FZR400
    I've looked into it and its tempting, certainly not a cost exercise otherwise no its not worth it for money value.
    There is a few different ways of doing it but the hardest is the ITB setup, yes you can run a pod per ITB and such, but the room doesn't allow for this easily and the spacing of such setups are difficult.
    The other way is like a car 4 cylinder, a plenum into one throttle body, does mean a large tb to flow at 18k rpm. Means low down suffers.
    The other way which is a compromise is working with dual throttles, now you can do this as a 4 into plenum style, or 2 into 1 webers / 2 x plenum setup. Throttles on this if i recall would be about 38-42mm. Then you have to also mount injector bosses/injectors. etc..
    As far as ECU control, there is two options - Full Standalone Ignition/Fuel or Stock CDI Ignition/ECU Fuel Control.
    I really wanted to do the efi conversion, and i might still do it one day in the future when i dont have anything in the way.

    But what put me off was a couple of things :

    Cost of bits to make intake, be it whatever design, including throttles and bosses, fuel rails etc...
    The need to really make a custom tank - ( I also want to do this anyway, but it would be a must).
    You need to run wideband o2 in the exhaust.
    ECU is needed.
    Dyno time to tune (granted you can do decent on road auto tune but dyno is greater).
    Other niggley bits.

    Then at the end of the day i simply thought, if going to all that effort and not running ITB's, why simply not just get a GS500 Carb Pair, Make custom manifolds, and done. All would be done for 300/400 bucks vs over potential 1k efi.
     
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    Last edited: Feb 5, 2020
  5. flea

    flea Well-Known Member Premium Member Contributing Member

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    , could be why he decided to go from the 4 pot to the 2 cyd bandit , will see what he has to say when i pick it up
     
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  6. flea

    flea Well-Known Member Premium Member Contributing Member

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    lol lol .. what a day and what a idiot ... went to go and pick up the motor at agreed time and price .. bloke turns around and says he decided it was to cheap and wanted another 70 bucks on top of the 100 agreed on ... most probably thought as came that far would pay the extra seeing i was already there .. needless to say hes still got it but a waste of a day and a lot of fuel .. fk theres some wankers out there if he had said that price originally might have still bought it but not into playing games ... does this mean im turning into a grumpy old man :commando:
     
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  7. risky

    risky risky

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    NO, just selective.
     
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  8. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Yep join the club ... Im now a lifetime member :lolsign:

    comes with dealing with total wankers, tossers, numptys, arseholes and straight up pricks, let alone women, for 50 years :D
     
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  9. Jethalter

    Jethalter Active Member Premium Member

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    i would have slapped the **** out of him first, then left him with the paper weight.
     
  10. flea

    flea Well-Known Member Premium Member Contributing Member

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    :mad:if had been a few yrs ago he would have been looking for his head ,but getting to old and gymied up for that type of **** now days but came close :aggressive: so just a few choice words then left
     
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  11. Jethalter

    Jethalter Active Member Premium Member

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    I dont blame you, sometimes its just not worth the hassle.
     
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