KX250F Head repair service + Kibblewhite stainless valves & spring kit

Description

This head service includes:  Fastheads KX250F general MX head service, seat profiles cut and a Kibblewhite steel valve kit installed with their dual spring kit for the heavier valves
.   We remove the old valves, soda blast away carbon and make a complete inspection.  The seats are machined using our race proven Rottler SG7 seat and guide machine.  Old school methods of seat grinding do not work on these new high RPM heads.  New valves on worn or improperly machined seats will wear out extremely fast.  The head is then assembled and vacuum tested for quality.  We can also adjust the valve shims for another .  Send your head in for inspection prior to purchase.  Fill out the work order on our web page.
We suggest this package for trail and none competition riding only.  Steel valve kits reduce the power by 15% due to the 40% heavier valves and springs.  We offer complete high performance packages with Chromium Nitride PVD coated Titanium valves in our ebay store for ONLY 0 more.
Most KX Motocross heads should be serviced every 80 hours or less for peak performance and reliability.
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 refacing 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.  The pictures may not show the exact parts so here's a list.
Call if you have any service questions.  435-668-7776
Service Menu
5 general head service, soda blast head, inspect head for all needs, cut concentric seats, professionally install
your
valves, springs, seals etc.  Stem and spring heights are checked and corrected and then vacuum tested.  No parts included.
9 General head service above plus upgrade Chromium Nitride Coated Del West Titanium valves, new OEM springs and seals.
8 Beryllium Copper intake seats installed when done with service or a package deal. (stock ones crumble and can do damage)
5 cam journal repair (binding from over torquing or slight seizure only)
5 porting when done in conjunction with a general service.
95 Complete motor top and bottom end motor rebuild.  Includes Hotrod crankshaft, main bearings, gaskets, seals, cam chain, piston kit, valves and labor.
High RPM small valve stem Motocross motors required specialized high tech valve seat machining equipment and skilled machinist in order to cut a concentric seat.  Most dealers, mechanics, race shops and automotive machine shops do not have this capability.  The result from a poor seat cut is hard starting, valve stems break and extreme wear on the valve face and guide.
We highly suggest staying with Titanium valves vs the installation of aftermarket heavy stainless steel valve kits that reduce output by 2hp, slows acceleration and peak RPM.  The use of Stainless require heavy springs that prematurely wears the stock seats.  All new dirt bike heads are designed to use Titanium for these reasons.  The seats need to be professionally cut (part of this package) or they will wear out any new valve.  7
to 10 day turnaround.
Machining Process:
Heads that produce this kind of HP, RPM and high thermal energy need special machining with very close tolerances for perfect concentricity.  We use the super accurate race developed Rottler SG7 seat and guide machine and cut all seat profiles with perfect concentricity to the guides centerline.  There are only a few race shops around the country including Racers ER / fastheads.com that can properly do a valve job on these new style MX heads.  You may want to read our article in Thumpertalk under engines to better understand the in these heads compared to general automotive.
Seat Blending:
This is basically porting where it is needed the most between the bottom of seat where it meets the casting up to the guide.  We take special care in producing a smooth unobstructed port job in this area for a lot better flow than factory.
Seat and Guide Replacement:
Beryllium Copper for increased cooling and major anti wear qualities when used with Titanium valves.  We replace worn or broken guides with Bronze Manganese for the same reasons.  It runs 9 to replace all guides and seats and cut seat profiles in a bare head.  We can usually fix for around slightly siezed cam journals and lifter bores for .
If you what to maintain maximum power you have to use Titanium valves as originally designed.  All current motocross engines use Titanium Valves for this reason.  If you have decided to go with steel valves and heavier springs for economical wearability you will loose more power than you can gain back from porting and cams.
If you want a complete port and polished head we charge another 5 when done in conjunction with the above service.
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.
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