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SCREAMIN' EAGLE® MILWAUKEE-EIGHT PERFORMANCE CAM KITS
J063042024-07-02
GENERAL
It is strongly advised that an authorized Harley-Davidson dealer install this kit. Special tools are required for proper installation.
Kit Numbers
25400199, 25400200, 25400202, 25400201, 25400353, 25400432, 25400476
Models
For up to date certified model fitment information, see the Parts and Accessories (P&A) Retail Catalog or the Parts and Accessories section of www.harley-davidson.com.
Verify that the most current version of the instruction sheet is used. It is available at: h-d.com/isheets
Contact Harley-Davidson Customer Support Center at 1-800-258-2464 (U.S. only) or 1-414-343-4056.
Installation Requirements
Installing this kit requires separate purchase of the following items from a Harley-Davidson dealer (see Table 1 ):
Table 1. Additional Parts Required
Item
Part Number
Cam Cover Gasket
25700370
Drive Gear Retention Kit
25566-06
Cam Spacer Kit
25928-06
Valve Spring Kit - See FITMENT NOTES below.
18100080
Adjustable Pushrods (Optional)
17900058
ECM Calibration
See dealer for details.
FITMENT NOTE 1: For SE8-447, SE8-462, SE8-498 and SE8-511 cam kits, when installed in 2023 and 2024 FLHXSE, 2023 and 2024 FLTRXSE, 2024 FLTRXSTSE, 2024 FLHX and 2024 FLTRX models, valve spring kit (18100080) IS NOT REQUIRED.
FITMENT NOTE 2: For SE8-515, SE8-517 and SE8-550 cam kits, when installed in 2023 and 2024 FLHXSE, 2023 and 2024 FLTRXSE, 2024 FLTRXSTSE, 2024 FLHX and 2024 FLTRX models, valve spring kit (18100080) IS REQUIRED.
FITMENT NOTE 3: For SE8-498, SE8-511, SE8-515 and SE8-517 and SE8-550 camshafts, when installed in ALL OTHER 2017 and later Milwaukee Eight equipped models, valve sprint kit (18100080) IS REQUIRED.
WARNING
Rider and passenger safety depend upon the correct installation of this kit. Use the appropriate service manual procedures. If the procedure is not within your capabilities or you do not have the correct tools, have a Harley-Davidson dealer perform the installation. Improper installation of this kit could result in death or serious injury. (00333b)
NOTE
This instruction sheet refers to service manual information. A service manual for this year/model motorcycle is required for this installation. One is available from a Harley-Davidson dealer.
Kit Contents
Table 2. SE8 Cam Kits
Kit Number
SE Performance Camshaft
25400199
SE8-447 Camshaft
25400200
SE8-462 Camshaft
25400202
SE8-498 Camshaft
25400476
SE8-511 Camshaft
25400201
SE8-515 Camshaft
25400353
SE8-517 Camshaft
25400432
SE8-550 Camshaft
There are no service parts available for these kits.
Table 3. Camshaft Specifications
Description
Lift
@ Valve
Intake:
Exhaust:
Duration
@ .050
Intake:
Exhaust:
Timing
@ .050
Lift
Open:
Close:
TDC
Lift @
Valve
Intake:
Exhaust:
SE8-447
.447 in
.462 in
197°
217°
Intake:
0° ATDC
17° ABDC
Exhaust:
42° BBDC
5° BTDC
.080 in
.064 in
SE8-462
.462 in
.463 in
197°
235°
Intake:
7° ATDC
24° ABDC
Exhaust:
53° BBDC
2° ATDC
.057 in
.086 in
SE8-498
.498 in
.491 in
209°
247°
Intake:
4° ATDC
33° ABDC
Exhaust:
60° BBDC
7° ATDC
.065 in
.103 in
SE8-511
Front Cylinder
.511 in
.511 in
207.8°
217.2°
Intake:
2.9° BTDC
24.9° ABDC
Exhaust:
40.5°
BBDC
3.3°
BTDC
.102 in
.091 in
SE8-511
Rear Cylinder
.511 in
.511 in
202.2°
217.2°
Intake:
1.2° ATDC
23.4° ABDC
Exhaust:
43.0°
BBDC
5.8°
BTDC
.102 in
.091 in
SE8-515
Front Cylinder
.515 in
.513 in
227°
249°
Intake:
2° BTDC
45° ABDC
Exhaust:
62° BBDC
7° ATDC
.056 in
.066 in
SE8-515
Rear Cylinder
.516 in
.515 in
219°
242°
Intake:
6° ATDC
45° ABDC
Exhaust:
61°
BBDC
5°
ATDC
.036 in
.052 in
SE8-517
Front Cylinder
.515 in
.513 in
227°
242°
Intake:
7° BTDC
40° ABDC
Exhaust:
62° BBDC
7° ATDC
.112 in
.066 in
SE8-517
Rear Cylinder
.515 in
.513 in
227°
242°
Intake:
7° ATDC
40° ABDC
Exhaust:
61°
BBDC
5°
ATDC
.112 in
.052 in
SE8-550
Front Cylinder
.552 in
.551 in
230°
255.2°
Intake:
9.4° BTDC
41.4° ABDC
Exhaust:
69.4°
BBDC
5.8°
ATDC
.116 in
.102 in
SE8-550
Rear Cylinder
.552 in
.551 in
226.8°
251.2°
Intake:
6.4° BTDC
40.4° ABDC
Exhaust:
68.4°
BBDC
2.8°
ATDC
.102 in
.091 in
INSTALLATION
Preparation
NOTE
This engine-related performance part is intended for High Performance or Racing applications. It is not legal for sale or use on pollution controlled motor vehicles. Engine-related performance parts are intended FOR THE EXPERIENCED RIDER ONLY.
WARNING
To prevent accidental vehicle start-up, which could cause death or serious injury, disconnect battery cables (negative (-) cable first) before proceeding. (00307a)
WARNING
Disconnect negative (-) battery cable first. If positive (+) cable should contact ground with negative (-) cable connected, the resulting sparks can cause a battery explosion, which could result in death or serious injury. (00049a)
Disconnect both battery cables, negative battery cable first.
High Performance Camshafts
Installation of this kit requires removal and installation of the cam support plate. Refer to ENGINE: BOTTOM END, Cam Support Plate, Removal and Disassembly/Assembly (Camshaft, Camshaft Bearings) in the service manual.
NOTE
Replace original cam cover gasket with new cam cover gasket (Part No. 25700370).
Measuring Piston-to-Valve Clearance
NOTE
If this cam is NOT being installed as part of a larger complete kit, check piston-to-valve clearance.
1. Apply layer of clay to crowns of pistons in areas where valves meet pistons.
Length/Dimension/Distance: 3 mm (⅛ in)
2. Replace hydraulic tappets with solid tappets.
3. See the service manual. Assemble the heads and valvetrain. Tighten cylinder studs to torque specified. Make sure that the pushrods can be spun with fingertips before rotating the engine.
4. Rotate engine through two complete revolutions by hand.
5. Remove heads and measure clay at its thinnest point.
NOTE
Clay must measure 1.52 mm (0.060 in) at its thinnest point. If this measurement does not meet minimum thickness, depth of valve notches must be increased. The depth of the notches must not exceed 3.43 mm (0.135 in).
If oversized valves are used, radial clearance must also be checked. Radial clearance of 1.27 mm (0.050 in) is recommended.
Measuring Valve-to-Valve Clearance
10.040 inch wire gauge
245 degree angle
3Valve margins
Figure 1. Beveling Valve Heads
  1. Rotate the engine so both intake and exhaust valves of the front cylinder are partially open. Shine a light through the exhaust port. Look through the spark plug hole to view the valves. If necessary, rotate to the point where the exhaust and intake valve heads cross (both valves off their seats by an equal amount).
    2. NOTE
    Figure 1 If it is necessary after inspection to grind the intake and exhaust valves in order to meet the 1.016 mm (0.040 in) clearance between the two valve heads, measure the margins (3):
    • 0.787 mm (0.031 in) minimum margin on exhaust valves, and
    • 0.381 mm (0.015 in) minimum margin on intake valves.
  2. A 1.016 mm (0.040 in) clearance is required between the two valve heads. Use a 1.016 mm (0.040 in) wire gauge (1) to measure this distance. To adjust the clearance, grind the edges of the intake and exhaust valves at a 45° angle (2).
  3. Repeat steps 1 and 2 for the rear cylinder.
Return Motorcycle to Service
WARNING
Connect positive (+) battery cable first. If positive (+) cable should contact ground with negative (-) cable connected, the resulting sparks can cause a battery explosion, which could result in death or serious injury. (00068a)
Connect both battery cables, positive battery cable first.