Close
Results 1 to 6 of 6
  1. 07-21-2015, 10:09 #1
    drift_g35
    drift_g35 is offline
    High Power Shooter drift_g35's Avatar
    Join Date
    Oct 2012
    Location
    Littleton, Colorado, USA.
    Posts
    888

    Default Need help tuning CV carbs

    I am looking to get my carbs tuned and maybe re-jetted. I have a project bike that I am working on that bogs after adding new exhaust. I know i can just take the bike somewhere and have it done but id really like to help and learn how to tune carbs as its a black magic to me. Does anyone here have the time to teach/help me? I dont know what the typical cost of a carb tune is so some quotes would be cool as well.

    The bike is an 83 Yamaha xj750.
    My EDC: Handcuffs, Bandana, and Ball Gag.

    If I'm ever at a party and the cops come to arrest people. Ill blindfold myself, throw the ball gag in, handcuff my hands, and hide in a closet. Police never arrest hostages!
    Reply With Quote Reply With Quote
  2. 07-21-2015, 10:28 #2
    TFOGGER
    TFOGGER is offline
    Rebuilt from Salvage TFOGGER's Avatar
    Join Date
    Dec 2008
    Location
    Aurora
    Posts
    7,784

    Default

    Quote Originally Posted by drift_g35 View Post
    I am looking to get my carbs tuned and maybe re-jetted. I have a project bike that I am working on that bogs after adding new exhaust. I know i can just take the bike somewhere and have it done but id really like to help and learn how to tune carbs as its a black magic to me. Does anyone here have the time to teach/help me? I dont know what the typical cost of a carb tune is so some quotes would be cool as well.

    The bike is an 83 Yamaha xj750.
    Hitachi or TK carbs?

    The TK carbs are a nightmare to get parts for, FYI.

    The Hitachi carbs are a little better, but also kind of an adventure to get parts for.

    Carb tuning is only a little bit art, mostly science. The YICS Yamahas make life little more complex due to the linked intake tracts.
    Light a fire for a man, and he'll be warm for a day, light a man on fire, and he'll be warm for the rest of his life...

    Discussion is an exchange of intelligence. Argument is an exchange of
    ignorance. Ever found a liberal that you can have a discussion with?
    Reply With Quote Reply With Quote
  3. 07-21-2015, 10:39 #3
    drift_g35
    drift_g35 is offline
    High Power Shooter drift_g35's Avatar
    Join Date
    Oct 2012
    Location
    Littleton, Colorado, USA.
    Posts
    888

    Default

    That is a good question. Without removing the carbs how can I tell?


    Sent from my iPad using Tapatalk
    My EDC: Handcuffs, Bandana, and Ball Gag.

    If I'm ever at a party and the cops come to arrest people. Ill blindfold myself, throw the ball gag in, handcuff my hands, and hide in a closet. Police never arrest hostages!
    Reply With Quote Reply With Quote
  4. 07-21-2015, 10:43 #4
    TFOGGER
    TFOGGER is offline
    Rebuilt from Salvage TFOGGER's Avatar
    Join Date
    Dec 2008
    Location
    Aurora
    Posts
    7,784

    Default

    They should have a logo cast or stamped in the side of one of the carbs, usually on the right side of the bike.
    Light a fire for a man, and he'll be warm for a day, light a man on fire, and he'll be warm for the rest of his life...

    Discussion is an exchange of intelligence. Argument is an exchange of
    ignorance. Ever found a liberal that you can have a discussion with?
    Reply With Quote Reply With Quote
  5. 07-21-2015, 15:09 #5
    jerrymrc
    jerrymrc is offline
    Stircrazy Jer jerrymrc's Avatar
    Join Date
    Jan 2004
    Location
    Colorado Springs
    Posts
    8,166

    Default

    A uni-sync is used to get the idle settings right on multiple setups. http://www.amazon.com/Edelbrock-4025.../dp/B00062YC2E Having owned 140 Corvair's I used this a lot.
    I see you running, tell me what your running from

    Nobody's coming, what ya do that was so wrong.
    Reply With Quote Reply With Quote
  6. 07-21-2015, 15:18 #6
    TFOGGER
    TFOGGER is offline
    Rebuilt from Salvage TFOGGER's Avatar
    Join Date
    Dec 2008
    Location
    Aurora
    Posts
    7,784

    Default

    Quote Originally Posted by jerrymrc View Post
    A uni-sync is used to get the idle settings right on multiple setups. http://www.amazon.com/Edelbrock-4025.../dp/B00062YC2E Having owned 140 Corvair's I used this a lot.
    Impossible to use on this bike because of the airbox design and the YICS passage in the head. In order to sync the carbs on this one, you need an old school mercury synchronizer or a set of vacuum gauges and a YICS block off tool(I have both). The YICS system was originally supposed to yield better low end response and idle quality, but in reality just makes it more difficult to work on.
    Light a fire for a man, and he'll be warm for a day, light a man on fire, and he'll be warm for the rest of his life...

    Discussion is an exchange of intelligence. Argument is an exchange of
    ignorance. Ever found a liberal that you can have a discussion with?
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules