Jims USA 1208-1351 User Manual

These instructions are for all mod­els of 120”, 131”, or 135” Alpha,
Beta Engines (Including Kits)

Rev I

9-12

No.1208-1351

Rev I

9-12

A Division of Thiessen Products, INC

IInnssttrruuccttiioonn SShheeeett FFoorr BBooxx 11 112200””,, 113311””,, oorr 113355””

EEnnggiinnee AAsssseemmbblliieess OOrr EEnnggiinnee RRaaccee KKiittss

The following instructions are for both 120“, 131”, or 135” Engine Assemblies” and “Engine Kits”, (top
end not assembled). These instructions will have information not only for assembly of the engine but will
have helpful info in other areas such as: the drive line area, electrical, tuning, oiling, and frame info, etc

Read thoroughly before starting any assembly.

Note: Throughout the following text we will make motor application reference as shown: “A” for Alpha
engines; “B” for Beta engines; and “06 FXD” for 2006 to present DYNA
FLH’s.

If you ordered and received an assembled engine assembly, we recommend you read all three instruction
booklets to become familiar with your new engine. Note that your engine assembly does not come with
a carburetor or ignition. See page 2 for more information.

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and 07 FLH for 2007 to present

JIMS®120”, 131”, or 135” Kit Engine

General Instructions

Check Box Contents:

Verify you have received two boxes. After inspecting the exterior of the boxes for damage, proceed to
open and examine the contents of each box. Make sure there is no damage and you received the cor­rect version of the JIMS
bags or the Short Block wrapper. This is to keep the parts as clean as possible. Read red tag!

Start with Box One:

Verify the engine case color matches what you ordered. Use the checklist on page 9 and confirm you
received everything on the list. Close the box.

Box Two:

Verify that the color of the cylinders and heads match with the checked color you ordered. Use the
checklist in box 2 & box 3 instructions on the last page. Do not unwrap the heads. Do not unwrap the
pistons or rings unless you suspect damage. Close the box.

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120“, 131”, or 135” Race Kit. Resist the temptation to open the sealed plastic

555 Dawson Drive, Camarillo, CA 93012 Phone [phone] • Fax [phone]

1

No.1208-1351

Rev I

9-12

A Division of Thiessen Products, INC

IInnssttrruuccttiioonn SShheeeett FFoorr BBooxx 11 112200””,, 113311””,, oorr 113355””

EEnnggiinnee AAsssseemmbblliieess OOrr EEnnggiinnee RRaaccee KKiittss

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
to use 2- H-D

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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:

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carburator H-D No.27926-02. You will need

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There is nothing particularly difficult about assembly of the JIMS

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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

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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

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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

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stock TWIN CAM
notches are necessary to get the big bore cylinders to clear one another.

engine. The 120’s, 131’s, or 135’s cylinder spigot

NOTCH

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 bottom of their stroke (BDC). See Fig. 2.
All gasket surfaces must be perfectly smooth and clean to properly seal the

REAR

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

Fig.2

dirty places. Your JIMS®120“, 131”, or 135” Race Kit engine is going to
have some of its most highly

555 Dawson Drive, Camarillo, CA 93012 Phone [phone] • Fax [phone]

2