CRF450 Head Rebuild Service Valve Wear Fix BeCu Seats CrN Ti Valves

Description

This is our famous 9 package upgraded with Chromium Nitride Coated Titanium Intake Valves for extreme anti wear protection!
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.  O
ur 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. 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. Retains 100% original power plus adds better flow with seat profiles and bowl porting.
This package
includes:
Milling
out the stock intake seats and installing new Beryllium Copper alloy Seats. These seats are 100% compatible with lightweight Titanium valves and last longer than the aftermarket stainless kits on the stock OEM seats. This package also includes replacing the exhaust guides with Bronze Manganese.  Most all CRF heads we receive for repair have worn exhaust guides due to the rocking action from the rocker arm. To keep the cost down we only replace the intake seats and exhaust guides as this is usually all that the CRF heads need. Cutting the stock exhaust seat is also a must after replacing guides to maintain concentricity. The stock Stainless exhaust valves and seats wear slower than the intakes but prematurely widen and pit from corrosion. The exhaust and the intake seats are then blended / ported up to the guides as seen in the picture. This is the critical area that creates 90% of the flow obstacles in the port. You you will notice a power gain throughout the power band. Our package insures quality by assembling with new parts and vacuum testing.  We use your spring seat locators, retainers and keepers if not worn or damaged. The spring installed height and stem heights are checked and corrected.  or  more will will adjust your valve shims.
Actual Parts List:  Beryllium Copper Intake Seats, Bronze Manganese exhaust guides, Chromium Nitride Coated Ti intake valves, Kibblewhite Black Diamond exhaust valves, OEM springs, Viton guide seals.
Simple 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 inspection.  Adjust valves shims if requested.
The problem and solution:
The intake valves wear out prematurely in the CRF's because the seat material is not compatible with the OEM Titanium valves.  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 compatible with the stock seat material.
Unfortunately
heavier springs are needed to control the stainless valves. It reduced the time between adjustments but also reduced the power by up to 2 horse power and revved 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 Uni cam 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 Stainless Steel race valves with a super slick Nitride coating and the Bronze Manganese guides with tighter tolerances that cool and self lubricating which slows the wear process. The stock exhaust seats are more compatible with steel and stainless steel so we don't replace them unless they have been cut to deep or have decaying on the OD.
OUR GUARANTEE
you will get our general head service
free
with this package for life, if it ever needs it!  (original customer only)
Call prior to purchase with any questions
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 are race engines and they loose 2 to 3 hp and rev slower with Stainless valve setups.
If you have decided to go with steel valves and heavier springs for longer wear 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.
For 99 you can have the above installed into a new head. If you want to send in your complete head with cams, lifters, rockers etc we will adjust your valve shims for another . A complete port and polish job is another 6.00 when done in conjunction with this package.
Send your heads and engines to:  Fastheads 1141 E 540 N #6, 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.
With the economy in shambles, hanging on to your current machine and keeping it in prime condition is the new standard.  We can keep you running and updated!
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. His sons race on CRF 250's.
Fastheads is based out of Saint George, Utah.
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