KB PERFORMANCE - KB426C.STD - Hypereutectic Piston Kit - '99-'06 Harley-Davidson Electra Glide Ultra Classic FLHTCU, Dyna 35th Anniversary Super Glide
KB Performance's standard-bore Hypereutectic Piston Kit for '99-'06 Harley-Davidson engines is machined from T-5 heat-treated 390 alloy, diamond-cut to within a gram of weight and half a thousandth of an inch across the set. That precision allows a tighter install than typical replacement pistons, reducing piston rock and improving ring seal, provided KB's instructions on clearance and top ring end gap are followed given the alloy's thermal conductivity. Two pistons, pins, spiral-lock clips, and Hastings moly rings are included; rings sold separately.
Features
- Manufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum alloy
- Allows a tighter fit and longer piston and ring life
- Diamond-machined pistons are held to plus or minus one gram weight and less than one-half-thousandth-inch (.0005") tolerances from piston to piston
- Each kit contains two pistons, pins, spiral-lock pin clips and Hastings moly rings
- Replacement piston rings sold separately
- KB pistons can be installed tighter than other pistons. This results in less piston rock and better ring seal. Please read instructions included with piston for correct piston clearance.
- Due to the thermal conductivity and design of KB pistons, special attention is required to the top ring end gap. Please read instructions furnished with piston for correct ring installation.
Specs
- Bore - Oversize: Standard
- Bore Size: 3.750"
- Compression Ratio: 10.5:1
- Piston Material: Hypereutectic Alloy
- Stroke Length: 4.000"
- Piston Head Shape: Domed
- Product Name: Piston Kit
- Displacement: 88"
- Riding Style: Street
- Ring Material: Moly Coated
- Units: Kit
Frequently Asked Questions - KB PERFORMANCE - KB426C.STD - Hypereutectic Piston Kit - '99-'06 Harley-Davidson Electra Glide Ultra Classic FLHTCU, Dyna 35th Anniversary Super Glide
How do I know if this part fits my vehicle?
Check the fitment information listed on this page against your exact year, make, model, and (where applicable) trim, engine size, or configuration. If your exact vehicle isn't listed, or you're not sure, use the product chat on this page or contact our support team before ordering - we're glad to help confirm fitment.
What does it mean if a product is listed as universal fit?
Universal fit means the product is designed to work across a range of vehicles, not that it's guaranteed to fit every one. Compare the listed measurements, mounting requirements, and connector or hardware specs against your specific vehicle before ordering, since some installations may need additional hardware or minor fabrication.
Where can I find installation instructions for this product?
General installation notes are provided above where available. For detailed step-by-step instructions, refer to the manufacturer's documentation included with the product, or use the product chat on this page for questions about difficulty, required tools, or whether professional installation is recommended.
What if I have more questions about this product?
Use the product chat on this page for fitment, specs, installation, and compatibility questions, or contact our support team directly for help before you order.
