SCREAMIN' EAGLE PRO 10.5 COMPRESSION, 4.060 INCH BORE AND 4.625 INCH PISTON STROKE
J050512009-11-30
GENERAL
NOTE
Always check piston-to-valve clearance with non-stock camshafts.
All dimensions listed on these instructions are in inches.
High compression piston applications require installation of appropriate compression release in cylinder heads.
The pistons in this kit have an Electroless Nickel plating in the piston pin bores and require the use of a non-plated piston pin only (22310-10).
Kit Numbers
22574-10, 22576-10
Table 1. Kits
Kit | Application |
|---|---|
22574-10 | Standard, 4.060 in. (front & rear) |
22576-10 | +0.010 in. (front & rear) |
Models
These kits fit Harley-Davidson Twin Cam models equipped with the following items:
- Screamin' Eagle Pro® MVA, 110+, or ACR performance cylinder heads.
- Screamin' Eagle Pro 4.060 inch Bigger Bore cylinders
- Screamin' Eagle Pro 4-5/8 inch stroke flywheels.
- Screamin' Eagle lower piston cooling jets are required with pistons (22315-06A)
NOTE
This engine-related performance part is intended for high-performance or racing applications and is not legal for sale or use on pollution-controlled motor vehicles. This kit may reduce or void the limited vehicle warranty. Engine-related performance parts are intended for the experienced rider only.
Additional Parts Required
NOTICE
You must recalibrate the ECM when installing this kit. Failure to properly recalibrate the ECM can result in severe engine damage. (00399b)
NOTE
ECM recalibration is required, which can be performed with the Screamin' Eagle Race Tuner Kit. Refer to the catalog or see a Harley-Davidson dealer.
Re-jetting and/ or re-timing of the engine may be required to realize the full potential of this performance product.
WARNINGRider 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 references service manual information. A service manual for your model motorcycle is required for this installation and is available from a Harley-Davidson Dealer.
INSTALLATION
WARNINGTo prevent accidental vehicle start-up, which could cause death or serious injury, disconnect battery cables (negative (-) cable first) before proceeding. (00307a)
WARNINGDisconnect 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)
| 1. | Refer to the service manual and follow the instructions given to remove the seat and disconnect the battery cables, negative cable first. | |||||
| WARNING When servicing the fuel system, do not smoke or allow open flame or sparks in the vicinity. Gasoline is extremely flammable and highly explosive, which could result in death or serious injury. (00330a) | ||||||
| 2. | Refer to the ENGINE: STRIPPING MOTORCYCLE FOR SERVICE and TOP END OVERHAUL, DISASSEMBLY sections of the Service Manual for cylinder head, cylinder and piston removal procedures. | |||||
| 3. | Follow the procedures in the ENGINE: SUBASSEMBLY SERVICE AND REPAIR, TOP END/ CYLINDER/ UPPER CONNECTING ROD sections of the service manual for inspection of parts. | |||||
| 4. | See the ENGINE: SUBASSEMBLY SERVICE AND REPAIR, CYLINDER section of the service manual for boring and honing instructions. NOTE Install the top ring (barrel-faced) and second ring (taper-faced Napier) with the "N" marking facing up. Oil ring rails can be installed either side up. The 4.060 inch cylinder base gaskets and cylinder head gaskets included in the kit eliminate the need for O-rings (11273). Do not use O-rings on cylinder dowels or cylinder spigots. When installing new base gasket, install with the embossed side down and the concave side up. NOTE Checking piston-to-cylinder fit at this location per table 2 is for reference and does not specify actual running clearance. | 
Figure 1. Piston Measurements | ||||
| 5. | See Figure 1. Measure the piston width (1), 90 degrees horizontally from both sides of the piston pin hole and 1.275 in. down from the deck surface (top) of the piston (2). See table 2 for piston-to-cylinder fit at this location. | |||||
| 6. | The pistons in this kit are front and rear specific. Install the piston marked "FRONT" in the front cylinder with the arrow pointing towards the front of the engine. Install the piston marked "REAR" in the rear cylinder with the arrow pointing towards the front of the engine. | |||||
| 7. | Refer to the ENGINE: TOP END OVERHAUL, ASSEMBLY section of the service manual for piston, cylinder and cylinder head installation procedures. |
Table 2. Specifications
Piston: | Clearance (in.) |
|---|---|
Piston-to-cylinder fit (Loose) | 0.0026-0.0036 |
Piston pin fit (Loose) | 0.0003-0.0008 |
Top Ring End Gap Second Ring End Gap Oil Control Ring Rail Gap | 0.012-0.020 0.016-0.024 0.008-0.0028 |
Top Ring Side Clearance Second Ring Side Clearance Oil Control Ring Side Clearance | 0.0010-0.0022 0.0010-0.0022 0.0003-0.0072 |
Table 3. Service Wear Limits
Piston-to-cylinder fit (Loose) | Wear Limit (in.) |
|---|---|
Fit in cylinder (Loose) | 0.0061 |
Piston Pin Fit (Loose) | 0.0011 |
Top Ring End Gap Second Ring End Gap Oil Control Ring Rail Gap | 0.030 0.034 0.038 |
Top Ring Side Clearance Second Ring Side Clearance Oil Control Ring Side Clearance | 0.0030 0.0030 0.0079 |
Piston Pin Retaining Ring (Circlip) Installation
NOTE
Circlip gap must be at 12:00 or 6:00 position when installed.
| 8. | See Figure 2. Insert the open end of the circlip (1) into the notch (3) on the groove (2) around the piston pin boss so that the gap is at the 12:00 or 6:00 o'clock position when installed. | 
Figure 2. Circlip and Piston 
Figure 3. Install Circlip | ||||||||||
| 9. | See Figure 3. Position your thumb (1) as shown, and press firmly until approximately 85% of the circlip (2) is seated in the groove. | |||||||||||
| 10. | Being careful not to scratch or mar the piston, use a small-bladed screwdriver to wedge the circlip into the remainder of the groove. Repeat for the remaining circlips. NOTE Make sure the piston circlip is fully seated, or ENGINE DAMAGE WILL OCCUR. | |||||||||||
| 11. | Refer to the ENGINE: ASSEMBLING MOTORCYCLE AFTER STRIPPING section of the service manual for final re-assembly procedures. |
NOTE
Always follow the break-in procedure outlined in the appropriate owner's manual after rebuilding an engine.
SERVICE PARTS
Figure 4. Service Parts: Screamin' Eagle Pro 10.5:1 Compression, 4.060 Inch Bore, 4.625 Inch Stroke Pistons
Table 4. Service Parts Table: Front and Rear Piston Kits
Kit | Item | Description (Quantity) | Part Number |
|---|---|---|---|
Kit 22574-10 Piston Kit (Standard) | 1 | Piston (front, standard) | Not sold separately |
2 | Piston (rear, standard) | Not sold separately | |
3 |
| 22526-10 | |
4 |
| 22310-10 | |
5 |
| 22097-99 | |
Kit 22576-10 Piston Kit (+0.010) | 1 | Piston (front, +0.010) | Not sold separately |
2 | Piston (rear, +0.010) | Not sold separately | |
3 |
| 22529-10 | |
4 |
| 22310-10 | |
5 |
| 22097-99 |