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  1. #1
    Senior Member orwjason's Avatar
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    Jetting for pipe?

    I am going to be removing the stock pipe and bolting on a FMF Fatty. Everything else is stock. What kind of increase in jetting am I looking at? I was thinking 1 or 2 sizes up with the main, but what about going up 1 with the pilot, needle? I have experience rebuilding and tuning carbs, so this isnt foreign to me, just picking some of the real experts brains here for a good starting point. Thanks for any input.
    86 TRX250R
    ESR TRX5 Center Mount Pipe & Silencer
    V-Force 3 Reeds
    ESR Airbox Eliminator

  2. #2
    Supporting Vendor acecarlos's Avatar
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    Two sizes up on the Main and 1 size up on the Pilot...likely will be a bit rich with the FMF pipe.

    Carlos.
    BDT MOTORSPORTS 909-466-9152 M-F 9:00 AM to 6 PM, Saturday 10 AM to 4:30 PM. Visit our Web Site at WWW.BDTMOTORSPORTS.COM or email: BDTMOTORSPORTS@YAHOO.COM 'SIMPLY THE BEST' BDT MOTORSPORTS'

  3. #3
    Senior Member pantera1975's Avatar
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    Quote Originally Posted by acecarlos View Post
    Two sizes up on the Main and 1 size up on the Pilot...likely will be a bit rich with the FMF pipe.

    Carlos.
    Thats what I did on my 86 R too. at the time I was using klots r-50 and 40-1.

  4. #4
    Senior Member orwjason's Avatar
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    Thanks guys, if its a bit rich should I remove air box lid, or would that be another size up un both main and pilot?
    86 TRX250R
    ESR TRX5 Center Mount Pipe & Silencer
    V-Force 3 Reeds
    ESR Airbox Eliminator


 

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