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Thread: Scorpion Exhausts . . . Jetting HELP

  1. #1
    I steal from AF1 GanjamanUSS's Avatar
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    Scorpion Exhausts . . . Jetting HELP

    Anyone know what the jetting for scorpion stainless steel exhausts might be ?

    Just picked some up from Max, and wanted some input before I slap them onto my bike.

    Will standard jetting suffice ?

    Any help would be nice, and also anyone who knows a half decent welder in the brighton area would be a killer.
    Thanks
    Ganj / Freddie
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    ganjamanuss at msn.com

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  2. #2
    apriliaforum expert smokey_rs250's Avatar
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    My tygas needed 280/290 and they are much alike. See members gallery pics.

  3. #3
    apriliaforum expert spence88MPH's Avatar
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    standard jetting

    you lucky man!

    I was going to buy scorpions and the aprillia guy told me they leave the jetting standard. Others I asked told me to go up one down one size. I'm sure you can just put them on with standard jetting for a start.

  4. #4
    I steal from AF1 GanjamanUSS's Avatar
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    so I've been told go up one

    I've been told leave them

    and I've been told go down one

    Has anyone here, had 1st hand experience with Lomas or Scorpion pipes ( as I take it they are one and the same thing )

    and if so could they advise on the jetting ?

    And I know I'm a lucky bugger. Won't even tell you what I paid for them :p
    Thanks
    Ganj / Freddie
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    ganjamanuss at msn.com

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  5. #5
    Moderator spanairRS250's Avatar
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    I will !! not :p hahahaha it was well good. got my bits too.
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  6. #6
    apriliaforum expert spence88MPH's Avatar
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    jetz

    there's an old post, started by me (spencerossirep) and everyone gave a different answer, it'll be here somewhere, chrisiball runs them.

  7. #7
    apriliaforum expert spence88MPH's Avatar
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    spanair

    ukrsclub is a nice BTW, you build it?

  8. #8
    I steal from AF1 GanjamanUSS's Avatar
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    yeah me and spanair run it, lot of the site came from PHPNuke but its been heavily modded now and turned into something completely different

    check out our gallery, anyway back to the jetting question in hand . . . .
    Thanks
    Ganj / Freddie
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    ganjamanuss at msn.com

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  9. #9
    apriliaforum expert spence88MPH's Avatar
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    hmmm

    yeah, just saw where you got those pipes from! what a waste, surely would have been worth more to him in one piece than destroyed? hmmm

    I'm serious, you won't get a straight answer on optimum jetting! have a look at the post. It also has to do with weather temperatures and atmospheric pressure, what works for the boys in Austin Texas may not work for you in miserable old England! take it to a dyno tuner, only way to find out for sure.

  10. #10
    I steal from AF1 GanjamanUSS's Avatar
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    yeah this is true, shame really, as I'd love to stick them straight on, nice to know if anyone else in the UK has them

    I think chrisiball does well Lomas which are the same thing, so hopefully he'll share some of his wisdom this way. . .

    And no, it's gonna be worth more to him to strip the entire bike down and sell it as bits, it's an awful shame, but still, I nearly had a tear in my eye breaking it up . . .

    Anyway back to the jetting !
    Thanks
    Ganj / Freddie
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    ganjamanuss at msn.com

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  11. #11
    apriliaforum Member
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    You will never get a straight awnser about jetting because all bikes run slightly differently. One bike may be best on standard and another 1 size either way. You won't be far off with standard jetting here in the UK though.

  12. #12
    apriliaforum expert smokey_rs250's Avatar
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    With bigger jets you're on the safe side, you dont want to run your bike to lean.....

  13. #13
    apriliaforum Junkie
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    ganj

    Now then Ganj,
    Yeah ive got Lomas pipes which are said to be near enuf identical, and my bike was too rich on standard jetting so stu jones told me to go down a size on each carb 260/270.

  14. #14
    Registered User beanarillo's Avatar
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    Jetting

    I'd put the pipes on and go for a ride. Come back, take out the plugs and check the colour.

    I've put pipes on mine and was going to put 260/270 jets in as it was clearly too rich (plugs were blackish), HOWEVER, I've just purchased an AF1 racing performance filter and from previous threads it appears that the increased airflow may weaken the mixture slightly and correct it without messing with jets.

    So, I have left it standard and will wait to see the impact of fitting the filter before I change the jets.

    I'd be surprised if you have to go up sizes on an otherwise standard engine.

    The next run for the bike is Sat 9th at Lydden so if it is still too rich, then I'm gonna be running round like a blue arse fly swapping jets between sessions!!!

    Always best to border on the rich (safe) side anyway-it sacrifices a small amount of power that only the pro's would notice but at least you won't start melting internals.

    Beanarillo

  15. #15
    apriliaforum prov-nov
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    lomas pipes

    I recently had Lomas pipes put on my RS250 by BPS Racing (http://www.bpsracing.com/front.htm).
    They said that each bike is different and needs setting up on a dyno, some are fine on standard some aren't. Hence the conflicting advise I guess.
    The only way to be sure is the dyno. Use some of the cash you saved on the pipes. It's well worth it.

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