Mikuni TMX 38-27-K Series Carburetors

3.0 out of 5 3.0 (1 review)
$210.95 Save 10%! $189.95
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Specifications and Options

Brand Mikuni
Bore Size -
Spigot Mount -

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Product Details

        - Fits 2-stroke motocross, and off-road racing applications
        - Radial flat slide throttle valve provides 40% greater boost signal from air flow
        - Increased ar flow provides better throttle response & increased sensitivity to tuning
        - 38mm bore size recommended for 250cc racing engine


by PowerReviews
Mikuni TMX 38-27-K Series Carburetors

(based on 1 review)

Reviewed by 1 customer

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(0 of 1 customers found this review helpful)


Tight clearance and fitment issues.

By Onanysunday

from Minneapolis


  • Has Extra Jets Clamps
  • high-performance
  • Lightweight
  • Simple design


  • Missing Key Extra Parts
  • Plastic Throttle Valve
  • Taller Than Oem Carb
  • Throttle Cable No Fit
  • T-valve Scratches Easily
  • Way Bigger Than Oem
  • Wrong Cable Adjuster

Best Uses

  • Open Class Mx Enduro

Comments about Mikuni TMX 38-27-K Series Carburetors:

The included cable adjuster on this carb was incompatible with my OEM throttle cable end and prevented my cable from being attached to this carb. For the record, my throttle cable ends in a metal coupler that has internal threads, or in other words (it needs to screw into something in order to attatch itself to the carburetor) This scenario would've been ok if Mikuni had included different cable adjusters (in the included bag of extra clamps and jets) to work with the different throttle cable designs that are used on different machines. However, this was an oversight and the cable adjuster you may need to fit your throttle cable end simply does not exist and cannot be purchased, forcing you to modify (or grind down) your existing cable adjuster to somehow fit into the top of this carb, or you can opt to create your own throttle cable with generic throttle fitting on the end. Because of this, this is truly not a "Universal Carburetor". Also, it is advertised as being compact but is much larger and especially taller than the OEM 38mm Mikuni it replaces causing clearance issues. I cannot level the carburetor assembly because the top of the carb now hits the metal frame (spine) of the bike underneath the gas tank. Overall a good carb if you have lots of free space in your engine bay to work with and have a normal, generic type throttle cable end. Otherwise you're in for some fun trying to get things to fit the way you expected them to, right out of the box. Also, the plastic throttle valve slide somehow became scratched with visible, vertical score lines before I even had a chance to install it (just by opening the throttle valve a couple times prior to installation) They should've used a harder material such as metal on the throttle valve.

  • Was this a gift?:
  • No

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Specifications and Options

Brand Mikuni
Bore Size 38mm
Spigot Mount 44mm

Do you have questions about this product?

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2 Questions | 2 Answers
Displaying questions 1-2
  • Q:

    i need a carb or kit for a 83 it 490 yamaha micuni can you help me. yhanks
    Asked on 1/15/2013 by Anonymous

    1 answer

    • Staff Reviewer


      Thank you for your question! If you are needing help locating items for your machine please contact our sales department by phone at 888-339-3888, 619-623-3661 or you may also email us at Sales@BikeBandit.com. Please let us know if there is anything else we can assist you with.

      Answered on 1/16/2013 by Anonymous
  • Q:

    Will this carb work with my 89 yamaha yz250?
    Asked on 10/17/2012 by Al

    1 answer

    • Staff Reviewer


      Thank you for your question. This is the correct style of carb. You may need to re-jett to Yamaha Specifications. Recommending installation by professional service technician due to the fact the carb will need to be tuned to your bike. This is a universal product and is made to fit a wide range of motorcycles. Some modification may be required and we cannot guarantee fitment

      Answered on 10/17/2012 by Anonymous
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Rider Reviews - Summary
Overall Review:
3.0 out of 5 3.0 (1 review)
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