TRX450R Extreme Head Rebuild Complete Oversize CrN Ti Valves Max HP

Description

Fastheads deals exclusively in motocross cylinder heads and valve train components for all brands.  We machine, repair and service worn or damaged heads with the latest high tech equipment designed for high RPM multi valve heads.  Old school methods of valve seat re-facing or grinding will not work on these new heads!  Our primary goal is incredible reliability and reduced valve wear while maintaining stock or more power.  We do this by using compatible alloys, DLC type valve coatings and precise machining for perfect valve to seat concentricity.  We offer economy trail to full on race options depending your needs.
In this  service we perform big bore modifications on your head.  It's
designed for higher RPM motors or cylinder volumes of 480cc or larger.  Your head is torn down, soda blasted and inspected for all repair needs.  To improve valve wear and heat transfer on the intake valves we install Beryllium Copper seats.  We then cut the intake seats with a 5 angle race seat profile matched to the oversize 37 mm Chromium coated Del West race spec Titanium valves.  On the exhaust side we install Bronze Manganese exhaust guides and then cut a high flow seat profile to match 31 mm stainless Kibblewhite stainless valves.  The bowls are ported from the guides to the seats and and blended into the seat profile.  The porting, seat profiles and valve size in this mod is designed for a wide power band with increased top end.  Depending on the cam rev box your using we may suggest a spring kit. Please let us know what other mods you have installed.
Motors th
at are bored and or stroked benefit from the larger valves to fill the increased volume faster.  Beryllium Copper intake seats and Del West CrN PVD coated Ti valves wear a lot longer and is more reliable than stock Ti or stainless.   Heavy Stainless Steel valve conversions reduce the power by 2 to 3 hp, revs much slower and has more of a tendency to float.   Specifications may vary slightly depending on the year.  We can supply cams and set up your valve shims for an added cost.  We also offer stroker cranks, big bore cylinder kits, gaskets, cam chains, shim kits etc.
Please fill out the work order on our web site and mention you want this package.  the shipping address is on the work order.
Other options:  F
or 99 you can have all this 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 .
The problem and solution:
The intake valves wear out prematurely in the TRX450 because the seat material is not compatable with the OEM Titanium valves.  The stock powdered metal seats are abrasive, transfer heat poorly and tend to corrode much faster than the high tech 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 the original. The original fix was to replace the valves with the 40% heavier Stainless Steel which are more compatable with the stock seat material and heavier springs to control the valve.  It reduced the time between adjustments but also reduced the power by up to 2hp and reved slower plus 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.  Unfortuetly 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 compatable with steel and stainless steel so we don't replace them unless they have been cut to deep or have decayed on the OD.
If we find any other problems in your head we will estimate and give you a call.
The price is for labor, intake seats and exhaust guides only.  No other parts included.
Please note:  Modern valve faces should never be cut our you will loose the hard facing and treated surfaces.  For this reason we only assemble with new valves.  You can either supply yours or we can supply at a reasonable price.  We offer a wide variety of valves in stainless or titanium, OEM and Manganese guides, guide seals, gaskets, and valv seats 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!
The before and after pictured head had a valve had broken off, the old seats were machined out and oversized copper alloy seats were installed to repair the damage.  The gouges and damaged areas were welded and re-surfaced.  This can get expensive but its sometimes better than loosing an expensive port job and the head is better than new.
Please check out our ebay store for motorcycle tools, rebuild kits and rebuilding services.
Send your heads and engines to:  FastHeads.com 1141 E 540 N #7, Saint George, UT 84770
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.
On Apr-05-08 at 17:49:47 PDT, seller added the following information:
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