CRF Head Valve Wear Fix Complete Rebuild! Retains 100% Hp Assembled Upgrade

Description

Why buy a new head and end up with the same valve wear problems.  We can rebuild your head better than new with a high tech valve train that lasts many time longer!  If your bike is hard to start and your always having to adjust your valve shims than this option or possibly one of our more economical packages may be your fix.
This package includes:
Lifetime intake wear warranty.  Tear down, soda blast cleaning and a full inspection.  We then mill
out the stock intake seats and install new Beryllium Copper alloy Seats.  These seats are less abrasive, transfer valve heat much faster and is 100% compatible with Titanium.  We use intake valves with a special space age chromium nitrite DLC PVD applied hard coat to protect the softer titanium.  This combination is currently the longest wearing package available including stainless steel and it maintains full power.
Most CRF heads we repair have worn exhaust guides due to the rocking action from the rocker arm.  We replace the guides with b
ronze manganese which also helps transfer valve heat and can be set up at tighter tolerances.  Its normal for the exhaust valves to wear at a slower pace and need less adjustments but they will start to create sealing problems if not replaced during the rebuild.  All seats profiles are cut using our race engineered Rottler SG7 seat and guide machine specially tooled for the small guide power sports type heads.  It is imperative that seat to guide concentricity is perfect for full compression at kicking speeds and reduced valve wear.  Most shops can't get near this degree of precision with conventional types of machining.  We port from the seats and into the port up to the guides.  This is the critical area that creates 90% of the flow obstacles and is usually left untouched from the factory.  You you will notice a power gain throughout the RPM range.  Your head is then professionally assembled, spring and stem heights are checked and corrected and then vacuum check for a perfect seal.  We use your spring seat locators, retainers and keepers.  For another can adjust your valve shims.  Ship your head complete with cam, cam holder, all bolts, etc.
Please fill out the work order on our website and send with your head for inspection before paying.
Actual Parts List:
A25 Beryllium Copper Intake Seats, Bronze Manganese exhaust guides, Del West CrN PVD coated Ti intake valves, Stainless exhaust valve either Kibblewhite or OEM Stellite, OEM or upgraded springs on certain models, viton guide seals.
Labor List:
Tear down, soda blast and inspect head.  Machine out intake seats and install BeCu seats. Install exhaust guides and ream to size.  Cut all seat faces. Blend / Port from seat to guides.  Assemble new valves and check stem height and final vacuum inpection.  Adjust valves shims if requested for .
Fastheads.com is the one stop shop for dirt bike cylinder heads, and valve train components.  We machine, service, modify and repair motocross heads with the latest high tech equipment.   Old school methods of seat re-facing will not work on these new high RPM heads!  Our primary goal is incredible reliability and reduced valve wear while maintaining full power.  We do this by using compatible alloys, special hard DLC valve coatings and precise machining for perfect valve to seat concentricity.  To suite your needs, we offer several options including economy stainless steel for trail to full on race packages.
See last picture for CRF options menu.
Feel free to call
435-668-7776
(lifetime limited wear warranty for this extreme package only)
If the intake valve shims need to be reduced more than 3 sizes form the size installed after the break in period you can send in the head for free servicing.  Includes intake valves, seats and labor for the lifetime of the head to the original owner of this repair only.  this does not warranty against heads damaged due to broken parts, timing issues, overdue valve adjustments, sanded motors, oil problems etc.  Head must be accompanied with the original dated and signed policy you received back with your rebuilt head.
Why buy a new head or even a valve job and end up with the same results?  Your probably reading this because your bike is hard to start, lost power and needs frequent valve adjustments.  This is our most popular CRF head package and is the cure
and upgrade for eliminating premature intake valve wear and solves all other problems inherent in the CRF heads.
Your head
will be returned ready to bolt on with all new valves, springs, seals, intake seats, exhaust guides, seat blending / bowl porting, professionally assembled and vacuum tested.  9package for the CRF250 04-09, CRF450 R and X thru 08 only.  This is the correct repair compared to installing heavy power robing Stainless intake valve kits.  Spend your time riding instead of adjusting valves and kicking a hard starting bike.  CRF250 rebuild, CRF450 rebuild
The CRF problem and solution:
The intake valves wear out prematurely in the CRF's because the seat material is not compatable with the OEM Titanium valve.  The OEM stock titanium valves have an oxide coating rather than a special Chromium Nitrite hard coating used on titanium to reduce surface wear. The stock iron powder seats are abrasive, micro weld and have poor heat transfer properties and tend to corrode much faster than Beryllium Copper seats.  Once the shim size is reduced more than 2 sizes the thin protective coating on the valve is diminished and wear accelerates at a much faster pace.  If the valve is not replace immediately it rounds out the seats.  If new valves are installed on the rounded seats they will wear out even faster than original. The original fix was to replace the valves with the 40% heavier Stainless Steel which are more
compatible
with the stock seat material.  Unfortunitly heavier springs are needed to control the stainless valves.  It reduced the time between adjustments but also reduced the power by up to 2hp and reved slower and put a strain on the other parts of the valve train including the stock seats.  OK for trail riding but not the ideal setup for racing at higher RPM.  Honda and all the other motocross manufacturers use Titanium for this reason.  Honda's CRF Unicam is a great design utilizing less space and weight but does have one shortcoming.  The exhaust uses a rocker arm that puts a slight lateral rocking action on the exhaust valve stem which requires a stronger valve stem.  This is the only reason they use steel exhaust valves.  Unfortunately this rocking action wears out the exhaust guides extremely fast making it near impossible to cut a concentric seat face.  The exhaust valves don't seem to loose their adjustment but do corrode and pit requiring the seat face to be cut.  We use bronze manganese exhaust guides for tighter tolerances, faster cooling of the valves and less prone to breakage.  The stock exhaust seats are more compatible with stainless steel so we don't replace them unless they have been cut to deep or have decaying on the OD.
Brent 435-668-7776.  All credit cards and PayPal accepted.
We can also supply all your top end needs including gaskets, pistons, cams etc.
CRF Motocross valve trains come with Ti intake valves for a reason!  They produce 2 to 3 more hp and rev faster than stainless steel valve setups.
If you have decided to go with steel valves and heavier springs for
wear ability
and lower cost (which we sell in our ebay store) you will loose more power than you can gain back from porting or cams.  If you what to maintain maximum power, RPM and acceleration you have to use Titanium valves as originally designed.  Especially on 250cc machines.   Honda only use SS exhaust valves due to the extra strength needed from the rocking action of the rocker arm.  We use Ti valves and lighter springs on the exhaust for full race needs but they are expensive and need replacing more often.
Send your heads and engines to:  Fastheads.com / Racers ER 1141 E 540 N #7, Saint George, UT 84770
If we find any other problems in your head we will estimate and give you a call.   This package is the same price for CRF250R, CRF450R, CRF250X and CRF450X
Please note:  Modern valve faces can not be cut due to the hard facing.  For this reason we only assemble with new valves.  We offer a wide variety of valves in stainless or titanium, OEM and Manganese guides, guide seals, gaskets, and valve seats, pistons and cams to match your needs.  If you want an endurance or the Ultimate race head we can build it.   Dealers and race teams are welcome.
We use the new race developed and proven Rottler SG7 seat and guide machine specially designed for accuracy and tooled for the power sports industry.
Please check out our ebay store for motorcycle tools, rebuild kits and rebuilding services.
We operate one of the largest mail order style service for complete engine, transmission and head work for off road race bikes.  It's our specialty so we can save you money and headaches.  See us at the WORCS races and other events around the west.   Brent Kirk has raced and has been involved with the technical aspects of engine building for the last 39 Years.  All of our employees including my sons are active racers and proven technicians.  As the old saying goes:  We eat, breath, sleep, dream and love dirt bikes.
On Apr-05-08 at 17:49:47 PDT, seller added the following information:
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