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"Not Free"
Upgrades: Carburetor
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| Factory R & D
has updated their high-performance bolt-on accelerator pump plate that
cures that annoying hesitation and stumbling while adding horsepower and
response. This product will also ease in starting. This product is basically a
bolt on replacement for the stock AP cover on the bottom of the carburetor. You
do have to use the OEM O-rings and screws. Some minor jetting changes may be
required with this mod. My bike only required adjustment of the fuel screw. For
more information regarding the P-38 search the T archives
Similar results may be obtained with using different accelerator pump
diaphragms. See Tuning the AP. |
The Power Now
for the 4 strokes are machined from aluminum with a stainless steel plate
pressed in. Improves snap right from idle and pull up to mid throttle. Reduces
stalling and clutch use when negotiating tight trails. Often you can pull a gear
higher out of turns or in slower situations. Order
here.
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Power Now Version 1: How It Works
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| The New and Improved Power Now™, is fast becoming known
as the "best power product you can buy for your bike under $100". It's
gives idle to midrange torque on four strokes and idle to increased top on
two strokes.
It is being used or tested by Factory Kawasaki, Kawasaki Europe,
Factory KTM in America and Europe, Suzuki offroad, Larry Roeseler, Team
ECC and others.
Power Now™ was recently endorsed by Yamaha Motor France Cross Country
and Enduro teams and TM Import France Enduro and MX Team.
It's the best new product of the year and was given a score of 9.5 out
of 10 in DirtRider Magazine. For 2-strokes, 4-strokes, ATVs and Mini
bikes, get the performance increase no other product can give you for this
price.
The New Power Now™, slices the single air
venturi going into the carburetor into 2 smaller, faster, venturis via the
PowerNow™’s ‘Power Plate’. Our revolutionary modification to our Power
Plate assists the vacuum of the fast moving air by drawing the fastest
moving air molecules through a precisely positioned hole in the plate,
drastically increasing the speed of the top and bottom venturis entering
the cylinder. With this new modified Power Plate, the result is volumetric
engine efficiency through uncompromised airflow velocity. To see how it
works, click here.
For instructions on how to upgrade your
"older" Power Now to the newer version, click
here.
FMF Racing Dynos (click on images to enlarge):
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Another great product by Zip-Ty Racing. Strong, well manufactured product. Using only
the best materials. Designed around industry standards, this is a product that
is designed to last; need I say more? Order
here.
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Scotts Adjustable Fuel Screw |
| WHAT IS IT? A quick and easy way for four-stroke owners to enter the wonderful world of cart adjustment.
WHAT'S IT COST? $17.95
WHAT'S IT DO? With every change in temperature, humidity or
barometric pressure, a four-stroke carb's settings change. Thumper carbs
change their fuel/air ratio by altering the amount of gasoline via a bleed
needle. Scotts' adjustable fuel screw replaces the stock screwdriver-style
needle with a T-handle needle. Very simple.
WHAT STANDS OUT? Here's a list of things that stand out on Scotts'
adjustable fuel screw.
- Function: Turning a fuel screw in decreases the amount of
gasoline, which leans the mixture. Turning the fuel screw out (counterclockwise) increases fuel flow, richening the mixture. Scotts
Performance's adjustable fuel screw allows you to make quick adjustments (even while the bike is running).
- Fitment: Keihin FCR carbs are almost universal on four-stroke
motocross bikes, so Scotts' brass fuel screw adjuster will fit on Honda,
Yamaha and KTM thumpers. It is easy to install.
- Length: Scotts Performance designed its adjustable fuel screw to be extra long. This not
only makes it easier to use, but, in the case of KTM four-strokes, easier
to reach. The T-handle allows you to determine how much the fuel screw has
been turned. (4) Regularity. This is a tool that you will use constantly.
WHAT'S THE SQUAWK? We have no complaints.
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Halfway: If you've ever wondered where the fuel screw on a Keihin
cart is, here's the answer. When fully installed, only the T-handle
sticks out. |
Pointy end: An adjustable fuel screw bleeds down
the amount of fuel entering the cart's circuitry. It's as easy to
use as your shock's compression adjuster. |
If you have ever tried to adjust the air/fuel
adjusting screw while the engine is running, one of these is a must! This "T"
handle presses onto the existing mixture screw and eliminates the need to carry
a special tool so one can dial in the mixture to minimize the stall/cough right
off idle. For more info see www.koubalink.com.
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Sudco makes a pilot air screw
(PAS) which is basically an adjustable pilot air jet. With this you can vary the
amount of air into the pilot circuit without changing jets. This is an aftermarket
product that fits into the same hole as the pilot air jet and includes a spring
to hold it's position. It is in the intake mouth of the carburetor. (part
numbers- 021-230 and 021-235).
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Number of turns out |
PAJ Correlation |
| 1 |
#100 |
| 3/4 |
#85 |
| 5/8 |
#75 |
| 1/2 |
#65 |
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One limitation the the PAS is that you must remove the carb bell to make the adjustment. TT member
Littlefoot drilled out the opening in his carb bell to 6 mm so he only had to
take of the air boot and insert a long screwdriver. 6mm gives you enough room to
get a screwdriver in that can actually turn the PAJ(S), but if the jet were to back
out it can't fall out and get into the intake tract.
From TT member Littlefoot:
"I first used a small straight blade screwdriver that would fit through the
slot, (air intake), and inserted it into the PAJ(S). I then used this to mark a
reference point on the intake bell, clamped the bell on a drill press and
drilled via the reference point. out to approx. 6mm,(used number drills), in
small increments. I kept putting the bell back on the carb to verify position
and access to the PAJ(S). I was concerned that I would break through the side of
the bell, but no problems, just go slow."
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