Racers ER / Fastheads.com has come up with the ultimate big bore top end for your CRF250 R or X 04-09. The perfect Vet weapon! You get The Athena 280cc Kit Complete with gaskets and piston. We prefer the Athena because it runs cooler, does not need case machining...
Racers ER / Fastheads.com has come up with the ultimate big bore top end for your CRF250 R or X 04-09. The perfect Vet weapon! You get The Athena 280cc Kit Complete with gaskets and piston. We prefer the Athena because it runs cooler, does not need case machining, has a much better Nickel Carbide plating and has 11cc more than the cheaper counter parts. We use a special cam grind for the big bore motor offering a very wide power band with plenty of over rev. The big bore kit alone produces mostly bottom end that signs off early. We also use a high quality valve spring kit designed for this cam. In order to give you a very long wearing, fast and reliable package we include a new 09 head fully ported and assembled with our Beryllium Cooper intake seat upgrade and 1mm oversized CrN PVD coated Titanium intake valves that outweats all other. Note: You can save $250 by sending your head for the complete upgrade. If you send your head we install new Bronze Manganese exhaust guides. See our $599 head service option in our ebay store. We also offer a core credit on all years crf heads. $50-$75
09 head with fastheads.com upgrade. Fits 04-09. In this service we take a new 09 head and machine it to accept Beryllium Copper Alloy intake seats that are 100% compatible with OEM and aftermarket Titanium valves. This eleminates the premature valve wear and retains the benefits of Titanium intake valves. The 09 head will retro fit all earlier years and has a better port configuration than earlier models for better all round power. We then assemble with new Chromium Nitride Coated 1mm oversized Titanium intakevalves, Black Nitride coated stainless exhaust valves for better exhaust guide wear, springs, spring locators, guide seals, retainers and keepers. The head is fully ported. We do not suggest using heavy stainless intake valves as they loose 2hp, rev slower and have a tendancy to float especially with this cam grind. Our head setup will outwear any stainless kit many times.
Package Contents. $2556 Suggested retail. Package price $2198. You save $358!
1-Athena 280cc big bore kit with top end gaskets. ($917 suggested retail)
1-Cam for big bore kit. 1-Spring Kit Specific for this cam. ($490 suggested retail)
1-New 09 ported head with BeCu intake seats, Chromium Nitride coated Titanium intake valves, Kibblewhtie Black Nitride coated stainless exhaust valves, Viton seals professionally assembled and vacuum tested. ($1149 suggested retail) Special Notes: We suggest that you start out with a new cam chain and a JD jet kit with jetting for the big bore. If you want to send us your lifter buckets, rocker arm and pin we can assemble and adjust the valves before shipping. We can supply these and all top end parts.
LIMITED OFFER: Send us your motor and we will professionally install this kit, adjust the valve shims, check all tolerances and install a new cam chain if needed for another $130! Shipping back will be around $50 to $75 to the lower 48 states. If you want us to inspect or rebuild the lower end we can do that to.
Call Brent (435) 668-7776. For more CRF head info go to crfheads.com or Fastheads.com
Why CRF intake valves wear out. The stock Honda iron powder steel seat inserts are not compatable with Titanium valves. The Beryllium alloy seat inserts we use are nothing less than a modern marvel and greatly improves heat transfer, creates a less abrasive surface and adds a padded effect to the valve surface. They are a also a lot more expensive. Titanium valves weigh 30 to 40% less and can use lighter springs even with radical cams. Titanium is not as hard as stainless valves so they wear much faster unless they have a Chromium Nitride hard coating. The stock CRF Ti intake valves have a very poor oxide hard coating which make the problem even worse. Honda uses stainless valves on the exhaust side because the rocker arm creates lateral movement and needs the stronger valve. The exhaust valves wear less becasue they are stainless and more compatible with the stock seat material.
Why not just use a Stainless Steel valve kit? Current race engines use Titanium valves for a reason. They are two thirds lighter than steel which enables lighter spring pressures. Lighter spring pressures don't hammer the valve against the seat as hard and lighter valves create less inertia. Less recipricating mass increases acceleration and peak RPM. Stainless valves in a race engine reduces the RPM's and creates a power loss that is to great for most competition needs. For trail riding, slower revs, lower top RPM and a few less HP is not a major issue. Stainless wears a lot better on stock seats and even longer with these new alloy seats. We sell a lot of the Stainless kits and new heads with these kit installed in our . Just make sure you start off with a good seat face or they will wear out prematurely.
Remember: Every shim size, .002", is that much worn of your valve and seat face. You will notice afer going 2 shim sizes your adjustments will become increasingly frequent. If your valves are worn out so is your seat surface. A new flat valve surface on a rounded seat results in a very thin contact area resulting in fast wear and less heat exchange. If you just need the seats re-surfaced / cut we offer that in our . If you want an endurance or the Ultimate race head we can build it. We also offer porting at a reduced price when purchased at the same time. Dealers and race teams are welcome.
We use the new race developed Rottler SG7 seat and guide machine specially designed for these type of race heads.
Please check out our ebay store for complete engine rebuilding, seat cutting/maintenance, rebuilding parts and tools.
Send your heads and engines to: Racers ER, 1141 E 540 N #7, Saint George, UT 84770
Brent has been in the technical end of the sport and also raced professional Motocross, Desert and Flat Track for the last 39 years. I let my kids do all the racing now while I just slave at the shop. We operate one of the largest mail order style services for complete engine, transmission and head work on dirt bikes and ATV's. It's our specialty so we can save you money and headachs. See us at the WORCS races and other events around the west.
On Apr-05-08 at 17:49:47 PDT, seller added the following information: | After purchasing, pay instantly with your credit card through PayPal! |
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