EDR ZX10R ZX-10R ZX-10RR HD cylinder head stud kit 2004 - 2025 Kawasaki
EDR Performance 2004-2025 ZX10R & ZX10RR HD Cylinder head stud kit
EDR Performance Heavy Duty Cylinder Head Stud Kit
FINALLY! A solution for Kawasaki riders that wanna push their 1000cc engines to the max! The EDR Performance HD Cylinder head stud kit for the 2004+ ZX10R/RR
EDR Performance is a leader in Performance & Engine Builds with multiple national championships, club championships around the world, HUNDREDS of race wins around the work, multiple track records, Daytona podiums and more. EDR built and tuned engines have always been the top placing and highest trap speeds in the MotoAmerica/AMA series year after year.
We have found the oem cylinder head bolts lack the strength to hold up to big power and high speeds. Not only in the fact it is a bolt, that is a TTY and no reusable and very prone to failure when more power is added. These oem bolts are not great, instead of actual stud and the material is an extremely low quality at best. For the average everyday commuter they are fine, but for those of you out ripping these things HARD, road racing them, drag or roll racing them, track-days and such the head gaskets will start to fail! Our custom EDR design and spec HD cylinder head stud kit gives you much higher clamping load on the cylinder head so when the pressure is up due to higher heat, more load, higher speeds, more compression and horsepower, your head gasket will hold!
We have found the ZX10R/RR engines to be one of the most powerful & reliable engines out there. We have seen over 205 rwhp on them with stock engine components and even got them up over 220rwhp! However the head gasket does take a beating and typically will last only 1 season at best. Kawasaki does not integrate the cylinder's into the upper crankcase so they are more prone to lose a HG before engines with 2 piece case/cylinders.
The kit comes complete with all the necessary HD cylinder head studs (10), HD cylinder head 12pt nuts (10) , HD hardened washers and both outer cylinder head bolts (2) Also included are detailed install instructions along with the proper recommended thread lubricant as needed. Installation is as easy as the OEM fasteners.
YOU CAN INSTALL WITHOUT REMOVING THE CYLINDER HEAD FULLY!
*MUST CONTACT US FOR DETAILS FIRST.
We also typically have the race kit head gaskets in stock as well
These studs and bolts are reusable for multiple rebuilds, unlike the OEM fasteners.
Key points about head studs:
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More even torque distribution:When tightening a stud, only the threaded section on the nut is twisting, allowing for more consistent pressure across the clamping surface compared to a bolt which twists along its entire lengthBetter for high-performance engines:Studs can withstand higher stress and are preferred for modified engines with increased boost or horsepower where head gasket integrity is criticalEasier reassembly:Since the stud remains stationary, it's easier to align the cylinder head during reassembly.
FITMENT:
2004-2025 ZX-10R
2011-2025 ZX-10RR
EDR produced stud kits are EXCULISVELY designed in house at our location by our head engine developer, Eric Dorn. Eric, who in his 30+ years and thousands of race engines has learned one of the most common failures in modern high performance engines is head gasket failures. One of the main reasons is todays OEM's use inferior, cheaply manufactured head bolts.
EDR produced head stud kits only use premium grade 8740 alloy and a proprietary ARP2000® alloy that are rated far superior to “aircraft” quality alloy steels.
Secondly, each stud is placed vertically into special racks and precisely heat-treated to 190,000 psi for the 8740 material and 220,000 psi for the ARP2000® material. This procedure ensures complete heat penetration and the results are far superior to those lesser quality studs from other manufacturers who just dump pieces in a basket and hope for the best.
Following heat-treat, each stud is centerless ground to make it as close to perfectly concentric as possible. This procedure involves about ten very slight cuts and results in an exceptionally straight part. It’s important to note that lesser quality studs are not even centerless ground – the material is thread rolled in bar stock form (mostly before heat-treat, when the material is easier to machine).
Because EDR produced studs are manufactured to such exacting tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned – something that won’t happen with inferior quality head studs.
EDR produced studs are thread rolled after heat-treat, which gives them about 2000% (that’s twenty times) better fatigue strength than those studs that are cut/threaded prior to heat-treat (a very common industry practice). It costs a lot more to do it this way, because it’s tough on tooling, but the results are well worth the extra effort.
These products are intended for closed course off road competition use only. Use of this product for any other purpose is strictly prohibited. Buyer assumes all responsibility to local laws, regulations and use. Racing parts are never legal for sale or use in California or any pollution controlled vehicle.
