Big Gun Evo Exhaust
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  1. #1
    Senior Member betopimienta's Avatar
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    Hi All , just thought i would post a report on an exhaust system install i just did on my Tdub recently. Although it was not a direct bolt up to the TW, [it was a ttr225 system] it did manage to fit nice and tight with the help of a spacer and a small bracket to custom fit it to my Tdub. It now has a nice throaty thump to it compared to the stock exhaust. With the recent re-jetting and exhaust mods the engine pulls better than it ever did.I kinda like the louder pipe too , helps wake up the sleepy drivers that swerve in your lane from time to time.



    Here is a video from my iphone of how it sounds.



    [media]http://www.youtube.com/watch?v=ykTxOBeY0h4[/media]

  2. #2
    Member bluedevilfootballman's Avatar
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    very nice very nice.

  3. #3
    Senior Member Wheelie Nelson's Avatar
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    Did you drill out your carb slide hole? It gives much better throttle response.

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  5. #4
    Senior Member betopimienta's Avatar
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    Quote Originally Posted by Wheelie Nelson View Post
    Did you drill out your carb slide hole? It gives much better throttle response.


    No ,i am not familiar with the carb slide hole mod. could you be more specific about this mod? The throttle response seems improved with just what i have done so far with jetting and exhaust. Does this apply to both style carbs, as i have the early version on my '99.

  6. #5
    Junior Member bigdreama's Avatar
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    Coolness occurring.
    2001 TW200 4500 miles

  7. #6
    Senior Member Wheelie Nelson's Avatar
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    oops, thought you had a post 2001 model. yeah, it's a mod for cv slide carbs.

  8. #7
    Senior Member bikerjosh's Avatar
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    Nice, I'm using the same set up on my TW.

    What does drilling the slide do, again? I thought there was some reason that you shouldn't drill, but can't remember why.

    Josh
    Not all men are capable of greatness, but all possess toughness.
    2001 TW a mod or two maybeHidden Content

  9. #8
    Senior Member srs713's Avatar
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    Quote Originally Posted by bikerjosh View Post
    Nice, I'm using the same set up on my TW.

    What does drilling the slide do, again? I thought there was some reason that you shouldn't drill, but can't remember why.

    Josh


    Air passing over the hole in the slide causes the vacuum that pulls it up. Up A slightly larger hole makes vacuum faster, speeding up the response between twisting the throttle and getting more fuel into the piston.



    This mod is tricky, because if you drill too big the effect is the opposite. Just a little larger is good.
    Stephen S.

    '07 TW200:

    15/50 sprockets, O-ring chain, D2Moto foot pegs

    tweaked carb (127.5 jet, 0.019 needle shim, idle screw @2.25),

    Rubbermaid "Action Packer" on homemade brackets

  10. #9
    Senior Member catamount's Avatar
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    betopimienta, very nice! Thanks for the video.



    I have the "early" carb and a very free flowing exhaust. Would you mind sharing what shims or jets you used to dial it in? I just bumped my main jet up to a 122 but I think it's too fat. I'm guessing that I'll end up at 120 or 118.



    Would love to know what you're running.



    Thanks!
    Check out my custom TW200 build Hidden Content .



    TTR225 SS header, FMF Turbine Core 2 pipe, EK o-ring chain, 15T front sprocket, 50T rear sprocket, 20W fork oil, Drag Specialities speedometer, Victory Vegas headlight, Acerbis universal supermoto front fender, Vintage Yamaha chrome gas cap, Integrated LED rear tail/turn/brake light, Yamaha Blaster shock, Pro Taper SE ATV High handlebar, Western Powersports off-road handguards, Pro Taper Pillow Top Lite grips, Over-sized foot pegs, Maxxis 6006 front tire, seat cover from eBay seller mac32756.

  11. #10
    Senior Member betopimienta's Avatar
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    Quote Originally Posted by catamount View Post
    betopimienta, very nice! Thanks for the video.



    I have the "early" carb and a very free flowing exhaust. Would you mind sharing what shims or jets you used to dial it in? I just bumped my main jet up to a 122 but I think it's too fat. I'm guessing that I'll end up at 120 or 118.



    Would love to know what you're running.



    Thanks!




    Catamount, am using a 118 main jet. I tried bumping up the pilot jet by one step ,but it did not improve so i reinstalled stock pilot jet and it idles smoothly now and has good throttle response. i added a washer that was slightly thicker than the stock washer on the needle.i salvaged the washer from some old electronics scrap i had laying around the house , so i don't know the exact thickness. It was kind of a "MacGyver" mod.

    The power comes on nicely when i roll on the throttle now. This exhaust and re-jet mod has been the best performance improvement so far, am very pleased with the results

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