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Thread: Yamaha Bravo Project

  1. #1
    Join Date
    Nov 2003
    Location
    Newfoundland
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    5,280

    Yamaha Bravo Project

    Been working on my little Yami as of late. Its a real project in every sense of the word. Doing a little restomod work on it trying to make it a better ditch banger. Since its been mine I've replaced the slide rail suspension with new pieces, bought a couple new heavy duty skis, rebuilt the top end (found a melted piston), put on a new track and replaced the bars with the BMX bars from my Dirt King.

    Last winter


    Bars

    Right now the sled is torn down to the bare body so I can straighten and pound out every dent and curve, pop rivet/weld the sheetmetal back together with thicker/longer rivets and brace the body where needed.

    Cut open the stock exhaust and opened up the passageways with the drill as well. When I had the head off I cleaned up all the ports so everything flows smoothly. Need to check what bottom sprocket I have as there are several options for more top speed or grunt, want more grunt.

    Little holes

    I mean there must be room for improvement?

    Big holes lol

    Should note that I have a stock exhaust as well just to compare what works better. Stock pilot is a 78 and the stock mix ratio is about 20:1 so with the exhaust opened and the mix at 30:1, I think I'll notice a gain. Also hoping to get a better sound.

    Also removed like 5 pounds of worthless crap like the oil mixing system, odd brackets, windsheild, rear rack, etc... Fun little project, made a headlight cover from a crazy carpet yesterday and have some number backgrounds to put on as well. This is just a simple project, just for fun, no big money spent and don't plan to spend much more. Looking for bar hooks and handguards as well.

    Riding pics from last winter. My buddy stopped for a tree when I was trying to power over some deep snow, small trees.



    James
    Last edited by BigGreenMachine; 12-08-2005 at 01:03 AM.
    My Feedback 85 TECATE 500 08 Honda 450R

  2. #2
    Join Date
    Oct 2003
    Location
    Goderich, Ontario
    --
    125
    I have a 1995 Bravo in mint condition (maybe 1000km) that my kids ride. Here is a picture.

    Good luck with your project!!


  3. #3
    Join Date
    Nov 2003
    Location
    Newfoundland
    --
    5,280
    Looking for a bigger then stock carb, needs to be a spigot mount 32mm. The stocker is a 28mm Keihin.
    My Feedback 85 TECATE 500 08 Honda 450R

  4. #4
    Join Date
    Oct 2005
    Location
    Escanaba michigan
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    72
    i have a bravo... i had it when since i was 7... i love those little machines

  5. #5
    Join Date
    Oct 2003
    Location
    Goderich, Ontario
    --
    125
    stock mix ratio is about 20:1 so with the exhaust opened and the mix at 30:1, I think I'll notice a gain.
    How do you figure 30:1 will gain you anything? How much experience do you have with 2 strokes?

  6. #6
    Join Date
    Nov 2003
    Location
    Newfoundland
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    5,280
    Enlighten me Rusty, I think I know where I went wrong here. 30:1 is a richer mixture? So really 20:1 is leaner?
    My Feedback 85 TECATE 500 08 Honda 450R

  7. #7
    Join Date
    May 2002
    Location
    Southeastern Wisconsin
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    3,658
    Quote Originally Posted by BigGreenMachine
    Enlighten me Rusty, I think I know where I went wrong here. 30:1 is a richer mixture? So really 20:1 is leaner?
    30:1 is a leaner mix. That's 30 parts fuel to 1 part oil.
    '02 Honda 416ex - A seasoned blend of 11 herbs and spices
    '04 Honda Recon - The yard machine and snow plow
    '88 Honda CR250R - Another chapter in my torrid all terrain affair

  8. #8
    Join Date
    May 2005
    Location
    Dorset United Kingdom
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    1,408
    Quote Originally Posted by OldSchoolin86
    30:1 is a leaner mix. That's 30 parts fuel to 1 part oil.

    Actually depends on what your talking about. Yes 30:1 is leaner on oil but richer on fuel. The 20:1 can also be leaner if your talking about the amount of fuel.
    85 Tri-Z "Rumble Bee"
    85 250R "Red Rocket"
    83 200X "Flat Tracker"

  9. #9
    Join Date
    May 2002
    Location
    Southeastern Wisconsin
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    3,658
    Quote Originally Posted by slothminx
    Actually depends on what your talking about. Yes 30:1 is leaner on oil but richer on fuel. The 20:1 can also be leaner if your talking about the amount of fuel.
    I think it's pretty safe when talking about mixing oil in to gas that richer or leaner can be reserved for the oil content.
    '02 Honda 416ex - A seasoned blend of 11 herbs and spices
    '04 Honda Recon - The yard machine and snow plow
    '88 Honda CR250R - Another chapter in my torrid all terrain affair

  10. #10
    Join Date
    Nov 2003
    Location
    Newfoundland
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    5,280
    Yes so wouldn't 30:1 give a better burn then 20:1 Osin86?
    My Feedback 85 TECATE 500 08 Honda 450R

  11. #11
    Join Date
    Aug 2004
    Location
    Ab Canada
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    4,368
    Quote Originally Posted by BigGreenMachine
    Yes so wouldn't 30:1 give a better burn then 20:1 Osin86?
    You will probably Notice a bit of increase in Throttle response, Less fouled plugs and cleaner running, i would just go 32:1 and call it good.
    1985 Tri-Z-

    Quote Originally Posted by mywifeknowseverything
    Just hit the Freakin Gas and Hold on!!!!!

  12. #12
    Join Date
    Sep 2005
    Location
    Lipetsk, Russia
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    2,824
    Wow, those Bravo's are pretty small, eh? Looks like a nice berm-basher machine though, probably bad for your back (looks like no rear suspension)... One of my friends has one, I should see how much he wants for it.

  13. #13
    oddball3's Avatar
    oddball3 is offline At The Back Of The Pack Arm chair racerFirst time rider
    Join Date
    Apr 2004
    Location
    New Jersey
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    224
    I would just stay with the 20:1 mixture, unless you want to rejet for a different mixture, It will run slightly richer with a 32:1 mixture.
    IN MY GARAGE:

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  14. #14
    Join Date
    May 2006
    Location
    elliot lake, on
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    30
    I had a 1983 bravo up untill this past winter, the thing never let me down. My dad bought it for me and my older brother when i was about 9 and my brother never had any interest in it so i was always riding it and working on it. Before last winter my dad left our familly and the ownership was givin to my brother for some reason because he is older them me. What does he do... he sells it and dosnt give me a damn penny. That'd when I went out and bought myself a 88 enticer which is also a hell of a machine.

  15. #15
    Join Date
    Nov 2003
    Location
    Newfoundland
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    5,280
    Bump

    Got a newer Bravo body and will be putting this thing back together sometime soon. Can't wait for the snow to fall.

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