Mercury 40 HP 2004-2005

Instructions for ordering: check jet dimensions. If the jet in the carb does not dimensionally measure like ours, then it is not correct. Do not buy it! It will not work. Try here: identify that jet.

Our year, make, and model fitment guides list jets for popular factory and aftermarket carbs, but due to numerous reasons there is not a way to make them 100% accurate. Therefore, do not rely on the fitment guides.  See also additional things to check before ordering.If you need help send us a picture of the jets removed from the carb. identify that jet can help as well. 
Please take a moment right now to measure the jet prior to ordering. Taking a bit of time now will help avoid issues later.

We have no control over jets once they leave us. Some people drill them out, test and tune, etc. To protect everyone from getting used and abused jets, jet sales are final. No exchanges or returns.

Help us help you! Please measure the jets before ordering and email with any questions. It is easier to check now then potentially have jets arrive that do not match!

*** All jet sales are final. No returns or exchanges.**** 

TYPICAL JET SIZE:
Main Jet - *
Slow Jet - *
*Typical size only- verify jet size and compare dimensions to those listed before ordering. See Jet Finder for other jets available.

SLOW/PILOT JETS price each jet
keihin slow harley 35-xxx and N424-25B

OVERALL LENGTH = 15mm
THREAD DIAMETER = 4.5mm
GENUINE keihin jets - price each*   OEM EQUIVALENT keihin jets - price each
GENUINE Keihin jet 35 $8.77

 

 
OEM equivalent Keihin jet 35 $6.47

 

GENUINE Keihin jet 38 $8.77

 

 
OEM equivalent Keihin jet 38 $6.47

 

GENUINE Keihin jet 40 $8.77

 

 
OEM equivalent Keihin jet 40 $6.47

 

GENUINE Keihin jet 42 $8.77

 

 
OEM equivalent Keihin jet 42 $6.47

 

GENUINE Keihin jet 45 $8.77

 

 
OEM equivalent Keihin jet 45 $6.47

 

GENUINE Keihin jet 48 $8.77

 

 
OEM equivalent Keihin jet 48 $6.47

 

GENUINE Keihin jet 50 $8.77

 

 
OEM equivalent Keihin jet 50 $6.47

 

GENUINE Keihin jet 52 $8.77

 

 
OEM equivalent Keihin jet 52 $6.47

 

GENUINE Keihin jet 55 $8.77

 

 
OEM equivalent Keihin jet 55 $6.47

 

GENUINE Keihin jet 58 $8.77

 

 
OEM equivalent Keihin jet 58 $6.47

 

GENUINE Keihin jet 60 $8.77

 

 
OEM equivalent Keihin jet 60 $6.47

 

GENUINE Keihin jet 62 $8.77

 

 
OEM equivalent Keihin jet 62 $6.47

 

GENUINE Keihin jet 65 $8.77

 

 
OEM equivalent Keihin jet 65 $6.47

 

GENUINE Keihin jet 68 $8.77

 

 
OEM equivalent Keihin jet 68 $6.47

 

GENUINE Keihin jet 70 $8.77

 

 
OEM equivalent Keihin jet 70 $6.47

 

GENUINE Keihin jet 72 $8.77

 

 
OEM equivalent Keihin jet 72 $6.47

 

GENUINE Keihin jet 75 $8.77

 

 
OEM equivalent Keihin jet 75 $6.47

 

GENUINE Keihin jet 78 $8.77

 

   
GENUINE Keihin jet 80 $8.77

 

   
GENUINE Keihin jet 82 $8.77

 

   
GENUINE Keihin jet 85 $8.77

 

   
GENUINE Keihin jet 88 $8.77

 

   
GENUINE Keihin jet 90 $8.77

 

   
GENUINE Keihin jet 92 $8.77

 

   
GENUINE Keihin jet 95 $8.77

 

   
GENUINE Keihin jet 98 $8.77

 

   

 
MAIN JETS price each jet
JETSRUS.COM Keihin vintage main jet 3D



OVERALL LENGTH = 8.0 mm
SHAFT DIAMETER = 6.8 mm
THREAD DIAMETER = 7.9 mm
Price each *

Jet vintage 75 $27.99

 

Keihin jet 100 $14.99

 

Keihin jet 108 $14.99

 

 

 

carb bowl screws
CARB BOWL SCREW - Sold each, modify cart for desired quantity *
Stainless steel allen head screw for carb bowl.
Length dimension is the shaft length of the fastener not including the length of the head.
Example: M4 x 10 (10 mm shaft length)
Sold each carb bowl screw M4 x 10 (0.39") $1.49
Sold each carb bowl screw M4 x 12 (0.47") $1.55
Sold each carb bowl screw M4 x 14 (0.55") $1.59
Sold each carb bowl screw M5 x 16 (0.62") $1.61
Sold each carb bowl screw M5 x 20 (0.78") $1.63

NEEDLE SHIM WASHERS
Stainless washers.
These are not a precision part, they simply raise the needle.

Needle shim most Mikuni 2.7mm ID x 6.30mm OD 0125A2M2.7 JRU-8027A 10 pieces

Needle shim most Keihin 3.2mm ID x 7mm OD 0125A2M3.2 JRU-8032 10 pieces

Needle shim 3.7mm ID x 7.9mm OD 0125A2M3.7 JRU-8037B 10 pieces

wrench_hex_carb_bowl
HEX wrench for carb bowl screws
hex wrench
Metric hex wrench short arm for screws $0.87
Extra short arm ball end for tight fitting areas 19109

TORX wrench for carb bowl screws
Extra short arm for tight fitting areas TORX 19110- note our screws are hex, this item is placed here as some carbs use torx screws.