Motorcycle / Harley Cylinder Heads & Parts - Evo | Birds Bitz https://birdsbitz.com.au/product-category/engine/cylinder-heads-components/cylinder-heads-parts-evo/ Aftermarket Harley Davidson Parts Store | Motorcycle Parts Brisbane | Birds Bitz Wed, 27 May 2026 16:12:19 +0000 en-AU hourly 1 https://wordpress.org/?v=6.8.5 https://birdsbitz.com.au/wp-content/uploads/2020/08/logo-150x110-1-100x100.png Motorcycle / Harley Cylinder Heads & Parts - Evo | Birds Bitz https://birdsbitz.com.au/product-category/engine/cylinder-heads-components/cylinder-heads-parts-evo/ 32 32 KPM Valve Spring Kit. Fits Big Twin 1984-2004, Sportster & Buell 1986-2003. Beehive Springs with .660in. Lift https://birdsbitz.com.au/online-shop/engine/cylinder-heads-components/cylinder-heads-parts-evo/kpm-valve-spring-kit-fits-big-twin-1984-2004-sportster-buell-1986-2003-beehive-springs-with-660in-lift/ Sun, 10 May 2026 15:14:53 +0000 https://birdsbitz.com.au/online-shop/uncategorised/kpm-valve-spring-kit-fits-big-twin-1984-2004-sportster-buell-1986-2003-beehive-springs-with-660in-lift/ By taking advantage of the latest development in valve spring wire chemistry and manufacturing techniques, KPMI® has developed ovate wire Beehive style springs that will live and perform at a high level in Harley Davidson® applications. By coupling these developments with strict KPMI® design protocols and employing multiple design, simulation, and FEA analysis software, we […]

The post KPM Valve Spring Kit. Fits Big Twin 1984-2004, Sportster & Buell 1986-2003. Beehive Springs with .660in. Lift appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> By taking advantage of the latest development in valve spring wire chemistry and manufacturing techniques, KPMI® has developed ovate wire Beehive style springs that will live and perform at a high level in Harley Davidson® applications. By coupling these developments with strict KPMI® design protocols and employing multiple design, simulation, and FEA analysis software, we were we able to overcome the torsional stresses unique to ovate wire springs that previously severely limited their operating parameters.

Note: Maximum Recommended Lift = .660in.

Installed Height: 1.860in.

Seat Pressure: 178#

Open Pressure: 371#

Tech Tips:-

* Rocker box clearance must be checked

* Spring travel must be checked

* Valve timing must be accurate

** Over revving will lead to pre-mature failure of Valve Springs & collars.

*“On Line Shopping Only

The post KPM Valve Spring Kit. Fits Big Twin 1984-2004, Sportster & Buell 1986-2003. Beehive Springs with .660in. Lift appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> KPM Valve Spring Kit. Fits Big Twin 1984-2004, Sportster & Buell 1986-2003. Steel Double Springs with .650in. Lift https://birdsbitz.com.au/online-shop/engine/cylinder-heads-components/cylinder-heads-parts-evo/kpm-valve-spring-kit-fits-big-twin-1984-2004-sportster-buell-1986-2003-steel-double-springs-with-650in-lift/ Sun, 10 May 2026 15:14:53 +0000 https://birdsbitz.com.au/online-shop/uncategorised/kpm-valve-spring-kit-fits-big-twin-1984-2004-sportster-buell-1986-2003-steel-double-springs-with-650in-lift/ Since 1939, KPMI® has taken great pride in our ability to design innovative performance improvements for valvetrains. This innovative ability has never been more apparent than with the development of the high-tech lightweight racing valve spring kits for the incredibly stressed and torturous environment in today’s V-Twin engines.Note: Maximum Recommended Lift = .650in.Installed Height: 1.860in.Seat […]

The post KPM Valve Spring Kit. Fits Big Twin 1984-2004, Sportster & Buell 1986-2003. Steel Double Springs with .650in. Lift appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> Since 1939, KPMI® has taken great pride in our ability to design innovative performance improvements for valvetrains. This innovative ability has never been more apparent than with the development of the high-tech lightweight racing valve spring kits for the incredibly stressed and torturous environment in today’s V-Twin engines.

Note: Maximum Recommended Lift = .650in.

Installed Height: 1.860in.

Seat Pressure: 185#

Open Pressure: 440#

Tech Tips:-

* Rocker box clearance must be checked

* Spring travel must be checked

* Valve timing must be accurate

** Over revving will lead to pre-mature failure of Valve Springs & collars.

*“On Line Shopping Only

The post KPM Valve Spring Kit. Fits Big Twin 1984-2004, Sportster & Buell 1986-2003. Steel Double Springs with .650in. Lift appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> KPM Valve Spring Kit. Fits Big Twin 1984-2004, Sportster & Buell 1986-2003. Beehive Springs with .610in. Lift https://birdsbitz.com.au/online-shop/engine/cylinder-heads-components/cylinder-heads-parts-evo/kpm-valve-spring-kit-fits-big-twin-1984-2004-sportster-buell-1986-2003-beehive-springs-with-610in-lift/ Sun, 10 May 2026 15:14:53 +0000 https://birdsbitz.com.au/online-shop/uncategorised/kpm-valve-spring-kit-fits-big-twin-1984-2004-sportster-buell-1986-2003-beehive-springs-with-610in-lift/ By taking advantage of the latest development in valve spring wire chemistry and manufacturing techniques, KPMI has developed ovate wire Beehive style springs that will live and perform at a high level in Harley Davidson applications. By coupling these developments with strict KPMI design protocols and employing multiple design, simulation, and FEA analysis software, we […]

The post KPM Valve Spring Kit. Fits Big Twin 1984-2004, Sportster & Buell 1986-2003. Beehive Springs with .610in. Lift appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> By taking advantage of the latest development in valve spring wire chemistry and manufacturing techniques, KPMI has developed ovate wire Beehive style springs that will live and perform at a high level in Harley Davidson applications. By coupling these developments with strict KPMI design protocols and employing multiple design, simulation, and FEA analysis software, we were we able to overcome the torsional stresses unique to ovate wire springs that previously severely limited their operating parameters.

Note: Maximum Recommended Lift = .610in.

Installed Height: 1.860in.

Seat Pressure: 175#

Open Pressure: 400#

Tech Tips:-

* Rocker box clearance must be checked

* Spring travel must be checked

* Valve timing must be accurate

** Over revving will lead to pre-mature failure of Valve Springs & collars.

*“On Line Shopping Only

The post KPM Valve Spring Kit. Fits Big Twin 1984-2004, Sportster & Buell 1986-2003. Beehive Springs with .610in. Lift appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> KPM Valve Spring Kit. Fits Big Twin 1984-2004, Sportster & Buell 1986-2003. Steel Double Springs with .600in. Lift https://birdsbitz.com.au/online-shop/engine/cylinder-heads-components/cylinder-heads-parts-evo/kpm-valve-spring-kit-fits-big-twin-1984-2004-sportster-buell-1986-2003-steel-double-springs-with-600in-lift/ Sun, 10 May 2026 15:14:53 +0000 https://birdsbitz.com.au/online-shop/uncategorised/kpm-valve-spring-kit-fits-big-twin-1984-2004-sportster-buell-1986-2003-steel-double-springs-with-600in-lift/ Since 1939, KPMI® has taken great pride in our ability to design innovative performance improvements for valvetrains. This innovative ability has never been more apparent than with the development of the high-tech lightweight racing valve spring kits for the incredibly stressed and torturous environment in today’s V-Twin engines.Note: Maximum Recommended Lift = .600in.Installed Height: 1.810in.Seat […]

The post KPM Valve Spring Kit. Fits Big Twin 1984-2004, Sportster & Buell 1986-2003. Steel Double Springs with .600in. Lift appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> Since 1939, KPMI® has taken great pride in our ability to design innovative performance improvements for valvetrains. This innovative ability has never been more apparent than with the development of the high-tech lightweight racing valve spring kits for the incredibly stressed and torturous environment in today’s V-Twin engines.

Note: Maximum Recommended Lift = .600in.

Installed Height: 1.810in.

Seat Pressure: 163#

Open Pressure: 361#

Tech Tips:-

* Rocker box clearance must be checked

* Spring travel must be checked

* Valve timing must be accurate

** Over revving will lead to pre-mature failure of Valve Springs & collars.

*“On Line Shopping Only

The post KPM Valve Spring Kit. Fits Big Twin 1984-2004, Sportster & Buell 1986-2003. Steel Double Springs with .600in. Lift appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> KPM Valve Kit. Fits Evolution Big Twin 1984-1999 https://birdsbitz.com.au/online-shop/engine/cylinder-heads-components/cylinder-heads-parts-evo/kpm-valve-kit-fits-evolution-big-twin-1984-1999/ Sun, 10 May 2026 15:14:53 +0000 https://birdsbitz.com.au/online-shop/uncategorised/kpm-valve-kit-fits-evolution-big-twin-1984-1999/ Kit Includes:* A Full Set of KPMI Stainless Steel Black Diamond Valves (Stock Head Diameter)* All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth of .002, with a surface buildup of .0002. This process improves wear properties, reduces friction, and provides resistance to corrosion and wear. Each […]

The post KPM Valve Kit. Fits Evolution Big Twin 1984-1999 appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> Kit Includes:

* A Full Set of KPMI Stainless Steel Black Diamond Valves (Stock Head Diameter)

* All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth of .002, with a surface buildup of .0002. This process improves wear properties, reduces friction, and provides resistance to corrosion and wear. Each valve is designed using Finite Element Analysis software, and profiles are tested on our computerized flow bench.

* Replaces OEM # 18074-83 & 18082-83

Suggested Additional Purchase:-

Top End Gasket Kit # CG-C9747 or CG-C9635

*“On Line Shopping Only

The post KPM Valve Kit. Fits Evolution Big Twin 1984-1999 appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> KPM Intake Valve. Fits Evolution Big Twin 1984-1999. OEM Replacement https://birdsbitz.com.au/online-shop/engine/cylinder-heads-components/cylinder-heads-parts-evo/kpm-intake-valve-fits-evolution-big-twin-1984-1999-oem-replacement/ Sun, 10 May 2026 15:14:40 +0000 https://birdsbitz.com.au/online-shop/uncategorised/kpm-intake-valve-fits-evolution-big-twin-1984-1999-oem-replacement/ * All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth of .002, with a surface buildup of .0002. This process improves wear properties, reduces friction, and provides resistance to corrosion and wear. Each valve is designed using Finite Element Analysis software, and profiles are tested on our […]

The post KPM Intake Valve. Fits Evolution Big Twin 1984-1999. OEM Replacement appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> * All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth of .002, with a surface buildup of .0002. This process improves wear properties, reduces friction, and provides resistance to corrosion and wear. Each valve is designed using Finite Element Analysis software, and profiles are tested on our computerized flow bench.

Head Diameter: 1.840in.

Stem Diameter: 0.3100in.

Tulip: 23º

Overall Length: 4.445in.

* Replaces OEM #18074-83

*“On Line Shopping Only

The post KPM Intake Valve. Fits Evolution Big Twin 1984-1999. OEM Replacement appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> KPM Oversize Intake Valve. Fits Big Twin 1984-2004. High Flow .100in. Oversize Valve https://birdsbitz.com.au/online-shop/engine/cylinder-heads-components/cylinder-heads-parts-evo/kpm-oversize-intake-valve-fits-big-twin-1984-2004-high-flow-100in-oversize-valve/ Sun, 10 May 2026 15:14:40 +0000 https://birdsbitz.com.au/online-shop/uncategorised/kpm-oversize-intake-valve-fits-big-twin-1984-2004-high-flow-100in-oversize-valve/ * All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth of .002, with a surface buildup of .0002. This process improves wear properties, reduces friction, and provides resistance to corrosion and wear. Each valve is designed using Finite Element Analysis software, and profiles are tested on our […]

The post KPM Oversize Intake Valve. Fits Big Twin 1984-2004. High Flow .100in. Oversize Valve appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> * All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth of .002, with a surface buildup of .0002. This process improves wear properties, reduces friction, and provides resistance to corrosion and wear. Each valve is designed using Finite Element Analysis software, and profiles are tested on our computerized flow bench.

Head Diameter: 1.940in.

Stem Diameter: 0.3108in.

Tulip: 25º

Overall Length: 4.440in.

*“On Line Shopping Only

The post KPM Oversize Intake Valve. Fits Big Twin 1984-2004. High Flow .100in. Oversize Valve appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> KPM Intake & Exhaust Valve Guide. Fits Big Twin 1984-2004 & Sportster 1986-2003. Standard Outside Diameter. OEM Replacement. https://birdsbitz.com.au/online-shop/engine/cylinder-heads-components/cylinder-heads-parts-evo/kpm-intake-exhaust-valve-guide-fits-big-twin-1984-2004-sportster-1986-2003-standard-outside-diameter-oem-replacement/ Sun, 10 May 2026 15:14:40 +0000 https://birdsbitz.com.au/online-shop/uncategorised/kpm-intake-exhaust-valve-guide-fits-big-twin-1984-2004-sportster-1986-2003-standard-outside-diameter-oem-replacement/ Cast Iron: After chemically separating several samples of cast iron material , analysis and evaluating the test data, we decided to have our own specification of cast iron made exclusively , us. We specify elements such as carbon, silicon, manganese, nickel, chromium, copper and sulfur to produce a highly pearlitic structure with dense fine grains […]

The post KPM Intake & Exhaust Valve Guide. Fits Big Twin 1984-2004 & Sportster 1986-2003. Standard Outside Diameter. OEM Replacement. appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> Cast Iron: After chemically separating several samples of cast iron material , analysis and evaluating the test data, we decided to have our own specification of cast iron made exclusively , us. We specify elements such as carbon, silicon, manganese, nickel, chromium, copper and sulfur to produce a highly pearlitic structure with dense fine grains , excellent wear resistance.

* OD = 0.5620in. Std size

* ID = 0.3095in.

* Replaces OEM # 18101-83

Tech Tips:-

Sold Each- 2 Required per Cylinder Head

Valve Guide Seal # KPM-71010-4

*“On Line Shopping Only

The post KPM Intake & Exhaust Valve Guide. Fits Big Twin 1984-2004 & Sportster 1986-2003. Standard Outside Diameter. OEM Replacement. appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> KPM Oversize Intake & Exhaust Valve Guide. Fits Big Twin 1984-2004 & Sportster 1986-2003. +.001in. Outside Diameter https://birdsbitz.com.au/online-shop/engine/cylinder-heads-components/cylinder-heads-parts-evo/kpm-oversize-intake-exhaust-valve-guide-fits-big-twin-1984-2004-sportster-1986-2003-001in-outside-diameter/ Sun, 10 May 2026 15:14:40 +0000 https://birdsbitz.com.au/online-shop/uncategorised/kpm-oversize-intake-exhaust-valve-guide-fits-big-twin-1984-2004-sportster-1986-2003-001in-outside-diameter/ Cast Iron: After chemically separating several samples of cast iron material , analysis and evaluating the test data, we decided to have our own specification of cast iron made exclusively , us. We specify elements such as carbon, silicon, manganese, nickel, chromium, copper and sulfur to produce a highly pearlitic structure with dense fine grains […]

The post KPM Oversize Intake & Exhaust Valve Guide. Fits Big Twin 1984-2004 & Sportster 1986-2003. +.001in. Outside Diameter appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> Cast Iron: After chemically separating several samples of cast iron material , analysis and evaluating the test data, we decided to have our own specification of cast iron made exclusively , us. We specify elements such as carbon, silicon, manganese, nickel, chromium, copper and sulfur to produce a highly pearlitic structure with dense fine grains , excellent wear resistance.

* OD = 0.5630in. Std size

* ID = 0.3095in.

* Replaces OEM # 18130-83

Tech Tips:-

Sold Each- 2 Required per Cylinder Head

Valve Guide Seal # KPM-71010-4

*“On Line Shopping Only

The post KPM Oversize Intake & Exhaust Valve Guide. Fits Big Twin 1984-2004 & Sportster 1986-2003. +.001in. Outside Diameter appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> KPM Exhaust Valve. Fits Evolution Big Twin 1984-1999. OEM Replacement https://birdsbitz.com.au/online-shop/engine/cylinder-heads-components/cylinder-heads-parts-evo/kpm-exhaust-valve-fits-evolution-big-twin-1984-1999-oem-replacement/ Sun, 10 May 2026 15:14:31 +0000 https://birdsbitz.com.au/online-shop/uncategorised/kpm-exhaust-valve-fits-evolution-big-twin-1984-1999-oem-replacement/ * All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth of .002, with a surface buildup of .0002. This process improves wear properties, reduces friction, and provides resistance to corrosion and wear. Each valve is designed using Finite Element Analysis software, and profiles are tested on our […]

The post KPM Exhaust Valve. Fits Evolution Big Twin 1984-1999. OEM Replacement appeared first on Birds Bitz Motorcycle Parts & Accessories.

]]> * All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth of .002, with a surface buildup of .0002. This process improves wear properties, reduces friction, and provides resistance to corrosion and wear. Each valve is designed using Finite Element Analysis software, and profiles are tested on our computerized flow bench.

Head Diameter: 1.615in.

Stem Diameter: 0.3096in.

Tulip: 29º

Overall Length: 4.525in.

* Replaces OEM #18082-83

*“On Line Shopping Only

The post KPM Exhaust Valve. Fits Evolution Big Twin 1984-1999. OEM Replacement appeared first on Birds Bitz Motorcycle Parts & Accessories.

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