JIMS 2459 User Manual
JIMS For motorcycles
Ta p p e t s
PROPER TORQUE
OF SCREWS
FLATNESS OF GASKET
CLEARANCE BETWEEN
LIFTER AND BORE
SQUARENESS OF BORES TO
LIFTER BLOCK FACE
SQUARENESS OF TAPPET
BLOCK BORE TO CAM LOBE
SQUARENESS OF AXLE TO ROLLER
CAM SHAFT END PLAY
PARALLELISM OF ROLLER TO CAM LOBE MAIN-
TAINING COMPLETE SURFACE CONTACT
OPTIMUM CONDITION WITH ROLLER MAKING
FULL CONTACT ON CAM LOBE RESULTS FROM
MAINTAINING CLOSE TOLERANCES
MAINTAINING PARALLELISM
FROM THE DECK TO THE CEN-
TER LINE OF THE CAM (INSIDE)
MAINTAINING
PARALLELISM (OUTSIDE)
CENTERLINE OF CAM BUSH-
ING IN CAM COVER IS
COAXIAL TO CAM ROLLER
BEARING IN CASE
Y
ou and your Harley® have just taken the first steps towards owning the finest precision designed and engineered valve
train components known to the Harley-Davidson® market. JIMS® tappets, tappet blocks and cam covers surpass the stock
requirements and demands of the present and future Harley-Davidson® motorcycle.
To achieve the best life possible from this tappet (or any other valve train part) you must be aware of some very impor-
tant issues.
1. Clean! Clean! Clean! You must use the best possible oil and oil filter available for your Harley-Davidson®. Use
only motorcycle or air cooled type engine oil. No Substitutes!
2. If these tappets are being installed in a motor that has had motor problems, or was rebuilt, wash out oil tank, oil
feed lines and motor.
3. If these tappets are replacing a previous tappet and cam problem, please make sure you know what caused the prob
lem in the first place.
4. The first area of concern is that the tappet roller must seat flat on cam. JIMS® tappets are square from the tappet
body to the axle bore within .0002”. If the roller is not seated flat on the cam, it will fail within a short period of
time.
5. Second concern: The same holds true for the tappet blocks. JIMS® tappet blocks are machined to hold the bores
perpendicular to the mounting flange within ±.0002 of an inch.
6. The next important concern is alignment of the cam itself. First, the cam will be, or should be, parallel from the two
bearing journals to the lobes within ±.0002, (this is just the cam). With the cam installed in the motor this can be a
lot different. For this reason, JIMS® has a precision machined cam cover to hold your cam to within .0002” of cam
centerline.
As you can see from some of the examples there are a lot of possible reasons for your valve train to have a shortened life.
For this reason JIMS® is continuously helping you achieve the longest possible life for your valve train.
Congratulations
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WARRANTY
All JIMS® parts are guaranteed to the original purchaser to be free of manufacturing defects in materials and workmanship for a period of six (6) months from the
date of purchase. Merchandise that fails to conform to these conditions will be repaired or replaced at JIMS® option if the parts are returned to us by the dealer (purchaser)
within the six (6) month warranty period or within ten (10) days thereafter.
In the event warranty service is required, the original purchaser must call or write JIMS® immediately with the problem. Some problems can be rectified by a tele-
phone call and need no further course of action. A part suspected of being defective must not be replaced by a dealer without prior authorization from JIMS®. If it is deemed
necessary for JIMS® to make an evaluation to determine whether the part is defective, it must be packaged properly to prevent further damage and be returned prepaid to
JIMS®with a copy of the original invoice of purchase and a detailed letter outlining the nature of the problem, how the part was used and the circumstances at the time of fail-
ure. If after an evaluation has been made by JIMS® and the part was found to be defective, repair, replacement or credit will be granted.
ADDITIONAL WARRANTY PROVISIONS
1.)
JIMS® shall have no obligation in the event a JIMS® part is modified by any other person or organization.
2.)
JIMS® shall have no obligation if a JIMS® part becomes defective in whole or in part as a result of improper installation, improper maintenance, improper use,
abnormal operation, or any other misuse or mistreatment of the part.
3.)
JIMS® shall not be liable for any consequential or incidental damages resulting from the failure of a JIMS® part, the breach of any warranties, the failure to
deliver, delay in delivery, delivery in nonconforming condition, or for any other breach of contract or duty between JIMS® and a customer.
4.)
JIMS® parts are designed exclusively for use in Harley-Davidson® Motorcycles. JIMS® shall have no warranty or liability obligation if a JIMS® part is used in
any other application.
Applies to
Big Twin and XL
“From the Track... To the Street!”
555 Dawson Drive, Camarillo, CA 93012 • Phone 805-482-6913 • Fax 805-482-7422