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Thread: 350x Carb upgrade - yz400 Keihin 39mm

  1. #1
    Join Date
    Mar 2006
    Location
    WI
    --
    128

    350x Carb upgrade - yz400 Keihin 39mm

    I am looking for an upgrade to my stock carb with a 39mm Keihin carb. The one in the auction is the exact one I am looking for. These carbs provide excellent performance.

    Does anyone know of it will fit?

    http://cgi.ebay.com/ebaymotors/ws/eB...087729688&rd=1
    1985 Honda 350x - Powroll 430 Kit & Lots more
    1984 Yamaha YZ490 - All the 2-stroke goodies

    Homemade "Trike"

  2. #2
    Join Date
    Oct 2002
    Location
    Northeast
    --
    17,493
    I don't know but it sure looks like alot of crap just to get fuel and air into the motor. What do you plan on plugging it into? Whats the plug for?

    Most guys seem to go with the 400EX carb upgrade. Lets us know if you find a better conversion....
    All our government does is distract us while they steal from us, misspend our tax $ and ruin our country

  3. #3
    Join Date
    Oct 2002
    Location
    Fresno Ca
    --
    2,695
    If you get it ill trade you a 400ex carb for that one. That is an FCR carb, they are by far the best 4 stroke carb. BUT its going to be close if the top of the carb will clear over the gastank.

  4. #4
    Join Date
    Mar 2006
    Location
    WI
    --
    128
    Yeah, thats what I've heard. Even for some 400ex carbs.

    I lost the bidding by 3 dollars But I will find another one like it and let you know how it bolts up.
    1985 Honda 350x - Powroll 430 Kit & Lots more
    1984 Yamaha YZ490 - All the 2-stroke goodies

    Homemade "Trike"

  5. #5
    Join Date
    Oct 2002
    Location
    Fresno Ca
    --
    2,695
    Honestly dude a 39 is going to be too much carb for a 350x. probably better with a 37. One off of a new 4 stroke 250 bike would be perfect. Right now on my BUILT X i have a carb off of the trx450. I think its a 40, and its just too much. The bike ran much better witht he 400ex carb. Actualy had more top end with the smaller carb, the engine kept some velocity through the intake.

  6. #6
    Join Date
    Mar 2006
    Location
    WI
    --
    128
    I don't think that will be an issue for me, my engine is currently being rebuilt with the 430 Powroll kit in it. Plus, your going to port the head I'll be sending that out in a day or so, I just need to clean it up.
    1985 Honda 350x - Powroll 430 Kit & Lots more
    1984 Yamaha YZ490 - All the 2-stroke goodies

    Homemade "Trike"

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