EDR R9 MT09 XSR900 Heavy Duty Cylinder head stud kit Yamaha
EDR Performance head stud bolt kit for new 2025 Yamaha R9
Plus: 2014+ MT-09, FZ-09,XSR900, FJ-09 & Tracer 900
The EDR HD Cylinder head stud kits are used by hundreds of racers and motorcycle teams around the world, nearly ALL Moto America top R7 Twins cup bikes! Top teams like Yoshimura USA, Giacchetto Racing and many others depend on EDR Performance developed HD Cylinder Head Stud Kits. We have several being used around the world in multiple championships!
The studs are heat-treated 8740 chrome-moly, centerless ground, and have
J-formed rolled threads after heat treat for maximum strength.
This kit is very high strength and can greatly help to prevent engine damage, reduce head gasket failures and ensure maximum performance from your engine!
The kit comes complete with studs, bolts, washers and nuts as needed. Also included are detailed instructions along with our recommended thread lubricant as needed. Installation is as easy as the OEM fasteners.
Unlike the OEM Bolts, these studs can be left in and reused multiple times! Also These studs and bolts are reusable for multiple rebuilds, unlike the OEM fasteners.
head studs are generally considered better than head bolts because they provide a more consistent and accurate clamping force due to their design, which prevents twisting during tightening, making them ideal for high-performance engines or situations where precise torque is crucial
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.Increased Clamping load:Head studs generally increase the clamping load on an engine head compared to stand head bolts, providing a more even and consistent clamping force due to their design which allows for greater stretch and better load distribution across the head gasket area; making them particularly beneficial in high-performance engines with increased cylinder pressures
FITMENT:
2025+ R9
2017+ MT-09/MT-09SP
2014+ FZ-09
2015+ Tracer 900
2016+ XSR900
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.
