FMF exhaust - now what?
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Thread: FMF exhaust - now what?

  1. #1
    Junior Member Dennis's Avatar
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    FMF exhaust - now what?

    Hi guys, I just bought a TW that has an FMF exhaust. The spark plug is white. What do I need to do to make this exhaust work on my bike?

    Thanks in advance
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  2. #2
    Senior Member grewen's Avatar
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    if you like the muffler, and are going to keep it, then some carb tuning is in order. richen it up a bit. go to the technical section and read some of the write ups on the subject. if you're going to put the stock muffler back on, or modify the FMF, do that first and then fool around with jetting and welcome to the forum
    Last edited by grewen; 04-14-2017 at 02:18 PM.
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  3. #3
    Super Moderator Purple's Avatar
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    Sounds like you need a bigger main jet

    Not a carb man myself, so I'll hand you over to the rest of the pack

    Welcome to the board ....
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    TW200 - 1998 - Japanese import - 5000 miles on the clock - TW225 Special Edition 2007

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  5. #4
    Senior Member jb882's Avatar
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    You need a bigger main jet. I would get each of the bigger sizes than what you have and test until it it right.
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    Super Moderator Purple's Avatar
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  7. #6
    Senior Member elime's Avatar
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    What year TW? How many miles on the plug?

    Find out what jet you have in the carburetor now and then order some richer and maybe one or two leaner.

    https://www.aliexpress.com/item/12-m...608.0.0.SSGwjq

    Ditto for the pilot jet.

    https://www.aliexpress.com/item/12-p...608.0.0.SSGwjq

    I have used these main jets with satisfaction but the verdict on the pilot jets is still out. Hopefully one will soon be tested by a forum member in Burbank. As far as I know I am the only forum member that uses AliExpress main jets.
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  8. #7
    Senior Member Deepseadan's Avatar
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    I'd call fmf customer service and tell them your bike make and model and what exhaust you purchased and will tell you how to jet your carb. They should know better than any of us.


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  9. #8
    Senior Member JerseyJeeper's Avatar
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    Quote Originally Posted by Deepseadan View Post
    I'd call fmf customer service and tell them your bike make and model and what exhaust you purchased and will tell you how to jet your carb. They should know better than any of us.


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    ?...?
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  10. #9
    Senior Member Deepseadan's Avatar
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    Quote Originally Posted by JerseyJeeper View Post
    ?...?
    Ok read it to fast, not what fmf pipe you purchased but what exhaust is on your bike. When I purchased a fmf exhaust for my old quad I played around with jetting and never got it quite right. Called fmf and they told me what jets to install and the quad ran perfect after that.


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  11. #10
    Junior Member Dennis's Avatar
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    Thanks for the responses. I figured it out: The jet was very loose. So fortunately an easy fix.

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