Keihin (it's "kayheen" with accent on
second syllable )
Unlike other jet companies (dj, rd, keyster), Factory Pro
Replica jets, Keihin and Mikuni, follow the original manufacturer's size scale
so the Factory Pro Replica jets are interchangeable with original jets - saving
a lot of time and improving accuracy for a good tuner.
Pilot jets
(aka "slow jets") Keihin |
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Keihin 21 series |
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OEM Honda CV carbs
We either have OEM or we make Factory Pro replicas |
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Keihin 22 series |
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We have OEM Keihin |
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Keihin 25 series |
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OEM Kaw CV carbs
FCR "Flatslides"We either have OEM or
we make replicas |
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Keihin 26 series |
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OEM Honda dirt bikes w/ CV
carbs + We have OEM |
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Main jets, Keihin
( say "Kayheen") |
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Keihin 393 series |
"Kayheen"
Known as:
"Keihin small, round, slotted jets"5 x .8
thread |
most OEM CV carbs |
We have:
50 to 250 (larger than Keihin's 225!) |
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Keihin 357 series |
"Kayheen"
Known as: "Keihin long hex jets"5 x .8 thread |
almost every FCR and CRS Smoothbore or Flatslide carb |
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Keihin 806 series |
"Kayheen"
Known as:"Keihin Harley jets"6 x 1.0 thread |
fits original HD Keihin CV carbs |
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tIdentify emulsion tubes and needle jets, Mikuni
Identify Yamaha Virago emulsion tubes and needle jets
Identify Honda VTR1000
emulsion tube / needle jet front and rear
needles
Keihin
FCR Flatslide needles |
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FCR and Smoothbores only |
I got really tired of trying
to use the original Keihin numbering / profile codes, so I made my own.
Very nice if you have everything perfect at every throttle position except
for 1/4 and only want to change that 1 thing!
Flatslides are super easy to tune on the EC997
dynos and not easy on anything else for many different reasons. |
needle shims
Emulsion Tubes, HDJ
note the fuel droplets at the backside of the needle. |
note the white spray at the backside of the needle. |
patented High Dispersal Jet System
HDJ
available for licensing
Easily retrofitable in many OEM Keihin, Mikuni and aftermarket carbs and
simple to make minor modifications in manufacturing process to incorporate.
Significantly better fuel atomization, runs without misfire at leaner fuel
delivery rates, better power from the same amount of fuel, more consistent,
smooth running, as verified on
EC997 Low Inertia
dyne FLUX value engine
smoothness testing. I can explain that if you are not using that dyne system
and cannot get that data.
All what an MJN promised, but it can run cleanly at all rpms and, because it
still used a tapered needle, is easy to tune properly. |
main jets
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Main Jets |
STYLE |
Slang.... |
Where usually used |
Notes |
"Keihin style"
mfg by Factory Pro.
Uses the same number size scale as original Keihin jets. |
393 Series
(5x.8 thread) |
Commonly known as:
"Small, round, slotted" |
used in original equipment CV
carbs on Honda, Kawasaki, Keihin equipped Triumph and some Yamaha |
Range:
We make larger upper range and lower smaller range
than usually available from importers:
#50-#200 in 2.5 increments:
#205 to #250 in 5 increments |
"Keihin style"
mfg by Factory Pro.
Uses the same number size scale as original Keihin jets. |
806 Series
(6x1.00 thread) |
Commonly known as:
"the big thread, round jets for the HD" |
Used only in original HD and
some European 94-97 ZX9 carbs
as far as I can tell. |
Range: larger upper range
#160 to #200 in 2.5 increments
#205 to #250 in #5 increments |
"Keihin style"
mfg by Factory Pro.
Uses the same number size scale as original Keihin jets. |
357
"Hex" Series
5 x .8 thread |
Commonly called "Keihin
Hex jets" |
Used in most Keihin FCR's,
Smoothbores and some dirt bikes. |
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carb tools
Mikuni Needle
Jets / Emulsion Tubes
UNDER CONSTRUCTION!!!!
- Factory Pro Precision and Quality.
- Factory Pro labeled.
- Experienced tuners know that proper design and multi-step inspection processes are
necessary to produce the highest quality carburetor jets.
- Each metering orifice is identical - jet to jet!
- Factory Keihin Main Jets are designed to be direct
replacements for Genuine Keihin
jets.
- Original "0,2,5,8,10" numbering system for "Keihin style".
- Factory Mikuni Main Jets are designed to be direct
replacements for Genuine Mikuni jets.
- Original "0,2.5,5, 7.5, 10" numbering system for "Mikuni style"
- Designed to flow on the OEM fuel flow scale - not an arbitrary scale that locks tuners
to hard to find brand.
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