555 Dawson Drive, Camarillo, CA 93012 Phone 805-482-6913 • Fax 805-482-7422
2
Rev F
6/08
No.1208-1351
A Division of Thiessen Products, INC
IInnssttrruuccttiioonn SShheeeett FFoorr BBooxx 11 112200”” OOrr 113311””
EEnnggiinnee AAsssseemmbblliieess OOrr EEnnggiinnee RRaaccee KKiittss
Recommended Ignition
1999-03 “A” and 2000-03 “B” models we recommend the Screamin’ Eagle
®
adjustable ignition JIMS
®
No.1286-1379 or H-D
®
No.32704-01. On 2004-2006 “A” and “B” models we recommend the
Screamin’ Eagle
®
Race Tuner Ignition JIMS
®
No.1286-1376 or H-D
®
No.32124-04. These are for carbu-
retor models only and these must be ordered separately.
Recommended Carburetor
It is recommended you use a 51mm CV Screamin’ Eagle
®
carberator JIMS
®
No.1286-1378, or H-D
No.27926-02. You will need to use 2- JIMS No.1286-1400 or H-D
®
No.26993-06 flanges and 2-
No.27035-05 seals. All these parts need to be ordered seperately. See our sales staff for more detailed
information.
Assembly Sequence, all Models:
There is nothing particularly difficult about assembly of the JIMS
®
120” or 131” 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” or 131” 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” or 131” 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” or 131” Race Kit are not interchangeable, front to rear, as they are in the stock TWIN
CAM
®
engine. The 120’s or 131’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 another. The
rear piston’s skirt notch (intake side) is necessary to clear the front piston when both are at the bot-
tom 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” or 131” Race Kit engine is going to have
some of its most highly
Fig.2
NOTCH
REAR
