YD-MJN

YD-MJNキャブレター

Yoshimura has dedicated years of research, development, and extensive testing to bring you new carburetors.
It is called YD-MJN (Yoshimura Downdraft – Multiple Jet Nozzle) carburetor, and it is created with a full of our know-how.

There are two different bore size models, YD-MJN24 and YD-MJN28.
Following is the product features and further information.

* All product photos shown are prototype YD-MJN carburettors.

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Stickler for detail

YD-MJN Structure

It is the feature of a downdraft structure that the throttle response is improved by the shorter distance between carburetor center and cylinder, however such short intake often causes insufficient carburetion.
MJN solves the problem and it sprays and deliver an ideal Air/Fuel mixture to cylinder.

Distance from carburettor centre to engine

Distance from carburettor centre to engine

YD-MJN Carburetor is a downdraft carburetor designed for single cylinder engine.
Since the main body leans to engine side, the distance to cylinder is shorter and that makes the Air/Fuel mixture delivery quicker.

Downdraft structure improves air intake efficiency by the shorter intake

Downdraft structure improves air intake efficiency by the shorter intake

  • Improvement of performance at high rpm
  • Improvement of throttle response
MJN (Multiple Jet Nozzle)

MJN (Multiple Jet Nozzle)

MJN (Multiple Jet Nozzle) produces more ideal atomized fuel than ordinary jet needles with the unique structure.

  • Improvement of combustion efficiency
  • Improvement of throttle response
  • Easier throttle operation by instant throttle response
MJN mechanism
Top cover for MJN only

Top cover for MJN only

Red top cap is a symbol of MJN carburetor.

Realize ideal intake length and position

Realize ideal intake length and position

Manifolds were specially designed for YD-MJN to realize ideal intake length and position. Two types will be commercialized to enhance the versatility.

Dedicated short insulator

Dedicated short insulator

Short insulator improves air intake efficiency.

No need to change the stock MONKEY frame and stock tank

No need to change the stock MONKEY frame and stock tank

The “YD carburettor” can be installed in the optimum position without changing the compact “MONKEY stock frame and stock tank”.
Yoshimura’s “Seriousness” has been poured into the “YD Carburettor”, which is ideal for horizontal engines.
More power for your special machine…

YD-MJN28 CARBURETOR SET YD-MJN24 CARBURETOR SET

Optional parts for YD-MJN Carburetor

Throttle holder set (Exclusive use for YD Carburetor)

  • Gunmetal gray/ L=550mm/ Part No. 671-040-5500
  • Gunmetal gray/ L=650mm/ Part No. 671-040-6500
  • Red/ L=550mm/ Part No. 671-040R5500
  • Red/ L=650mm/ Part No. 671-040R6500
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Aluminium Drain bolt (Red)

  • Part No. 771-C00-6100
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Aluminium air funnel set

  • D=24mm/L=55mm
  • D=28mm/L=45mm
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Optional parts machined drain bolt and machined aluminium funnel SET are fitted to YD-MJN24/28 carburettors respectively.
Finishes the impression of sharpness and high quality compared to the standard condition.

Jet set (Exclusive use for YD Carburetor)

  • MJ SET/ #72-#95/ Part No. 731-04007295
  • MJ SET/ #98-#120/ Part No. 731-040098120
  • PJ SET/ #35-#58/ Part No. 732-04003558
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Manifold set

YD-MJN24/28 carburetors were developed and set up with non-Yoshimura 125cc head kit, Yoshimura exhaust system & Yoshimura C.D.I.

For Monkey Z50 engine type

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Multi-use

Manifold Spacer Set

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L-form wire adapter

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