Valve Jobs - Seats and Guides
A Precision Valve Job is the core of a high-output, reliable motor. Though it may seem strange, Valve Jobs are done on brand new engines. Read on...
Race Tech uses a Rottler SG7 to provide a dependable, accurate, highest quality valve job. The Rottler is proven to be the best in the business for concentricity, surface finish, and valve seat profile.
Concentricity - It is common for stock heads to have .003" to .005" runout. RT Valve Jobs have guaranteed concentricity of less than .001".
Sealing - This outstanding concentricity and surface finish produces a vacuum test of better than 1%. The better it seals the more power it makes.
Durability - This alignment precision reduces valve bounce and side loading. As you might imagine this accuracy reaps huge benefits in the longevity of valves, seats, and guides.
A Certified Spec Sheet is included with every valve job.
Valve Job Types
- Standard 3-Angle Valve Job
A Standard 3-Angle Valve Job maintains factory designed flow and horsepower.
- Hi-Performance 5-Angle Radius Valve Job
A RT Hi-Performance 5-Angle Radius Valve Job adds horsepower without sacrificing reliability. The area around the valve seat is the most critical area of a port. A 5-Angle Radius Valve Job creates the best flow possible by adding additional angles and a radius. This increases air speed and flow over a 3-Angle Valve Job.
Reliability - The Top Tuners in the world all know a 5-Angle Radius Valve Job has superior flow while providing the same reliability as a 3-Angle Valve Job (the seat width is exactly the same.)
Race Tech manufactures Valve Seats. We stock many standard sizes and can make custom seats.
We can precisely remove and replace valve seats.
Sometimes even brand new stock seats need to be replaced for one of two reasons. 1) If the stock seat material is poor they are replaced for reliability. 2) Sometimes seats are replaced for better flow characteristics and power.
Valve Guide Installation
Race Tech manufactures Valve Guides. We stock many standard sizes and can make custom guides.
New valve guides are installed and precision honed to the correct tolerance. When guides are replaced, a valve job must be performed to ensure proper valve alignment. These two steps create valve to seat concentricity better than .001".
On certain models brand new stock guides are replaced if there is a known reliability issue.
Valve Guide Honing
When a new valve guide is installed it must be honed to correct tolerance. Honing the valve guide is another often overlooked, yet critical piece of building a World Class engine. If the clearance is too large the valve moves around causing side loading, leakage, and excessive wear.
Valve Refacing and Backcutting
Backcutting for Performance - With our Precision Valve Refacer, we create backcut angles to improve flow. This can be done on Titanium as well as Steel Valves.
Reconditioning Steel Valves - If the stem is within tolerance, a steel valves sealing surface can be reground often for less than the cost of a new valve.
Hi-Performance Titanium Valves
When a stock valve can be improved significantly we design our own. This can increase flow as much as 3 CFM while improving velocity at the same time. Currently KX250 and YZ250F valves are available. Check out the Product Search.