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  1. #1
    Member Alexander's Avatar
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    The 130 main jet

    Hey guys,

    This post is all about any questions ppl may have regarding the infamous 130 main jet.
    I personally am just now looking for a 130 main jet.

    I am also wondering what a "large round" vs "small round" is or if it even applies. I read a post where someone talked about his 130 main jet and specified that it was a large round. What does that mean?

    Any info on where to grab a 130 main jet for the TK mv28 carb would be great. (2013 TW)

  2. #2
    Senior Member jbfla's Avatar
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    You can purchase the jet from any Yamaha dealer or online OEM parts vendor.

    Prices will vary.




    Whenever you change a jet, you will need to re-tune your carb by adjusting the pilot screw.

    Jb
    Last edited by jbfla; 08-25-2013 at 11:52 AM.
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  3. #3
    Senior Member Dmd3058's Avatar
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    what exactly do you change the main jet for ? is it to give it more pep? or to adjust for altitude? Thanks

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    Senior Member jbfla's Avatar
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    Quote Originally Posted by Dmd3058 View Post
    what exactly do you change the main jet for ? is it to give it more pep? or to adjust for altitude? Thanks
    The TW carbs are set lean from the factory.

    A larger main jet, along with adjusting the pilot screw, will reduce surging, allow your engine to run a bit cooler, and perhaps give a slight boost in performance.

    For high altitudes, the stock jet is fine.

    jb
    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

  6. #5
    Senior Member Dmd3058's Avatar
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    Quote Originally Posted by jbfla View Post
    The TW carbs are set lean from the factory.

    A larger main jet, along with adjusting the pilot screw, will reduce surging, allow your engine to run a bit cooler, and perhaps give a slight boost in performance.

    For high altitudes, the stock jet is fine.


    jb

    what is considered high altitudes? im in pgh pa? is stock good for me or no? how exactly do you figure if you need a different one? im carb stupid never worked on one before or had one apart, so this is all new to me thanks in advance

  7. #6
    Senior Member chris209's Avatar
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    3, 000 ft above sea level Qualifies as high elevation.I think. If not sure of elevation of your town. You can google it OR use it as a perfect reason to ride the dub to go check out the city limit sign in your town. Usually has elevation posted somewhere along with the population.any reason is a good reason for me to ride.
    Johnny fell in a well? Lets ride!.
    Hoss is stuck up on the ridge surrounded by rattlers..Lets ride!
    Walmart bullet supply just replenished ? Lets ride!
    Gotta drop a duece!! RIDE RIDE RIDE!!!!!

  8. #7
    Senior Member jbfla's Avatar
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    Quote Originally Posted by Dmd3058 View Post
    what is considered high altitudes? im in pgh pa? is stock good for me or no? how exactly do you figure if you need a different one? im carb stupid never worked on one before or had one apart, so this is all new to me thanks in advance
    My aeronautical chart says the elevation of the airport runways is 1,252 feet...close enough to sea level for me.

    You can determine if your bike needs rejetting by how it runs.

    If it accelerates smoothly from idle to wide open throttle, with no hesitations, and if it doesn't surge at a steady throttle opening, your carb is set right.

    Spend some time reading the Technical Writeups on carb tuning, and look at the photos of the carb internals.

    However, there are other conditions that may make your bike run poorly...valve clearances, compression, electrical problems, vacuum leaks....

    jb
    Last edited by jbfla; 08-25-2013 at 10:56 PM.
    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

  9. #8
    Senior Member Dmd3058's Avatar
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    it says our elevation is at the high end 1,370 and the low end 710. so im good and i dont notice no surging and its seems to accelerate fine for a small thumper thanks for all the replys

  10. #9
    Senior Member fishguy's Avatar
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    If it ain't broke, don't fix it.

    6950 posts to go.

  11. #10
    Senior Member small's's Avatar
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    I rode mine with a 130 main jet and one washer under the needle up to 6,000' on and around the blue ridge pkwy and it did fine. I put the stock 126 back in it for my Utah trip but left the needle shimmed and it did fine up 9,600'. It studdered a bit under higher rpm about 8,000' but ran fine. I left it with the 126 in it when i got back home and it starts easy and doesnt take 5min for it to warm up like it used to. The shim and idle/air mixture helped.

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