Jims USA Twin Cam Racekit Box 1 1208-1351 User Manual
Page 3
555 Dawson Drive, Camarillo, CA 93012 Phone 805-482-6913 • Fax 805-482-7422
2
Rev I
9-12
No.1208-1351
A Division of Thiessen Products, INC
IIn
ns
st
tr
ru
uc
ct
tiio
on
n S
Sh
he
ee
et
t F
Fo
or
r B
Bo
ox
x 1
1 1
12
20
0”
”,, 1
13
31
1”
”,, o
or
r 1
13
35
5”
”
E
En
ng
giin
ne
e A
As
ss
se
em
mb
bl
liie
es
s O
Or
r E
En
ng
giin
ne
e R
Ra
ac
ce
e K
Kiit
ts
s
Recommended Ignition (Carburated)
1999-03 “A” and 2000-03 “B” models we recommend the Screamin’ Eagle
®
adjustable ignition H-D
®
No.32704-01. On 2004-2006 “A” and “B” models we recommend the Screamin’ Eagle
®
Race Tuner
Ignition H-D
®
No.32124-04 or use aftermarket equilivant. These are for carburetor models only and
these must be ordered separately.
Recommended Ignition ( fuel injected )
2001 to present EFI Dyna's, Softail's and 2002 to present Touring models use Screamin’ Eagle Pro
Super Tuner No. 32109-08A to fine tune your JIMS engine.
Recommended Carburetor
It is recommended you use a 51mm CV Screamin’ Eagle
®
carburator H-D No.27926-02. You will need
to use 2- H-D
®
No.26993-06 flanges and 2- No.27035-05 seals. All these parts need to be ordered sep-
arately. See our sales staff for more detailed information.
Recommended Throttle Bodies, Manifolds and Air Cleaner
Jims recommends that you use the Screamin Eagle, or Jims Elliptical Throttle Bodies, manifolds and
air cleaner kits for what ever application you require. See Dealers , websites, or catalogs for more
details.
Assembly Sequence, all Models:
There is nothing particularly difficult about assembly of the JIMS
®
120“, 131”, or 135” Race Kit engine.
With some differences, assembly is very much the same as if it were a standard TWIN CAM
®
. However,
because those differences are important, we request you closely follow our assembly instructions. The
JIMS
®
120“, 131”, or 135” Race Kit instructions are arranged in a Step-By-Step sequence. Each step
builds upon and is dependent upon the previous one. If you follow our instructions, Step-By-Step, you
shall assemble your JIMS
®
120“, 131”, or 135” Race Kit engine quickly and correctly.
The details of each step are also important. Please study and follow these step details closely.
NOTE: JIMS
®
Engines are not equipped for a cam sensor because it is not needed with the recommend-
ed ignition module. Disconnect as necessary per bike model shop manual. The pistons and cylinders
of the JIMS
®
120“, 131”, or 135” Race Kit are not interchangeable, front to rear, as they are in the
stock TWIN CAM
®
engine. The 120’s, 131’s, or 135’s cylinder spigot
notches are necessary to get the big bore cylinders to clear one another.
These notches make the front and rear cylinders different from one anoth-
er. The rear piston’s skirt notch (intake side) is necessary to clear the front
piston when both are at the bottom of their stroke (BDC). See Fig. 2.
All gasket surfaces must be perfectly smooth and clean to properly seal the
special high performance head and base gaskets.
Cleanliness
Your work area must be as clean as possible. From the point of view of
engine building, almost all motorcycle shops and private garages are very
dirty places. Your JIMS
®
120“, 131”, or 135” Race Kit engine is going to
have some of its most highly
Fig.2
NOTCH
REAR