Steel Valves or Titanium ????

[raptor_02]

I was just wondering if anyone knew for sure if the CRF has steel or titanium valves. Also does it have a 12/1 compression piston or a 10.5/1 compression piston. Any info would be greatly appreciated. Thanks

[airtime]

steel vavles. which are more durable and will last longer than the ti vavles. it seems most of the crf450 owners are replacing their ti vavles with a ss steel valve kit. looks like honda put more design into the trx450r than people are giving them credit for.

[250exen]

dont take me word for it but i heard that there is 2 titanium valves and 2 steel valves. also, the compression is10.5/1

[Cody_300ex]

ENGINE


Engine Type 449cc liquid-cooled single-cylinder four-stroke

Bore and Stroke 96.0mm x 62.1mm

Compression Ratio 12.0:1

Valve Train Unicam; four-valve

Carburetion Keihin 40mm flat-slide

Ignition Solid-state CD with electronic advance


DRIVE TRAIN


Transmission Close-ratio five-speed

Final Drive #520 chain; 13T/48T


CHASSIS / SUSPENSION / BRAKES


Front Suspension 47mm inverted Showa cartridge fork with 16-position rebound- and 16-position compression-damping adjustability; 12.4-inch travel

Rear Suspension Pro-Link Showa single-shock with spring-preload, 17-position rebound-damping adjustability, and compression-damping adjustment separated into low-speed (13 positions) and high-speed (3.5 turns); 12.6-inch travel

Front Brake Single 240mm disc with twin-piston caliper

Rear Brake Single 240mm disc

Front Tire 80/100-21

Rear Tire 110/90-19


DIMENSIONS


Rake 26.91 degrees

Trail 108.0mm (4.25 inches)

Wheelbase 58.5 inches

Seat Height 37.6 inches

Ground Clearance 13.4 inches

Dry Weight 222.0 pounds

Fuel Capacity 2.0 gallons


OTHER


Available Colors Red

Model ID CRF450R


;)

[Mr_Bub400ex]

dirtwheels said theyre ti but i bet they ss

[Guy400]

Do not take this as a fact (unless I wind up being right:D) but I thought I read somewhere that the intake valves are still titanium but the exhaust valves were changed to steel.

[Pro400EXC]

Well i believe thats how its been on the CRF since day one, Titanium intake,and steel exhaust,matter of fact,that is how it is on the bike...

[JOEX]

Is this thread about the 'bike' motor or the new 'quad' motor?
It seems to me that there might be a bit of confusion on what motor is being discussed.

Joe

[rtyfz450]

I know that the bike has a ti intake and stainless exhaust but I don't know what the 450r has I have seen alot of speculation on this point so I don't want to start somemore. I hope they are ti because ti is lighter and will last longer than ss, don't believe that stainless is better because it has no advantage over titanium except for cost( the stainless are cheaper) titanium unlike stainless has no flex or give in the metal and retains it original characteristics much longer than ss. it also makes the valve train lighter which means less mass and faster revs. I can't camplain about the crf it hauls:devil: hope the trx is the same

[norcal.z400]

sorry guys ... there steel.

Unicam valve train features a carburized single camshaft that directly actuates two 36mm steel intake valves. The camshaft exhaust lobe actuates two 30mm steel exhaust valves via a forked, low-friction roller rocker-arm

http://********.com/this-just-in/hondatrx450rfirstlook-03.htm

[raptor_02]

of course i was talking about the quad.:rolleyes:

[JOEX]

Originally posted by raptor_02
of course i was talking about the quad.:rolleyes:
That is what I thought;)

In your original post you asked for the specs on the CRF. The quad is not a CRF, it is a TRX450R. I think many people get this mixed up.

I just wanted to clarify things:)

Joe

[airtime]

like i said, go to thumpertalk.com and listen to all the crf450 owners complain about the ti intake vavles. everyone over there is switching to stainless steal vavles. the ti vavles are better for performance, but at the cost of very high maintanence. honda was smart to do away with the ti intake vavles for the trx. i doubt anyone will notice the power difference and the durability increase will keep you riding longer without any problems.:)

[ATC83]

I thought it was interesting that there are alot of complaints about the TI valves in the CRF450 but I haven't seen or heard of any concerning the 5 TI valves in the YZ450F motocross bike. It's not the power that the TI valves help with its the ability for the bike to rev quickly. I will guarantee that Tim Farrs TRX450 will have TI valves. Kevin Windhams Works Connection CRF450 has TI valves and he is one of the only guys this year that has been able to beat Carmicheal outdoors.

[Woody_YFZ]

Originally posted by ATC83
I thought it was interesting that there are alot of complaints about the TI valves in the CRF450 but I haven't seen or heard of any concerning the 5 TI valves in the YZ450F motocross bike. It's not the power that the TI valves help with its the ability for the bike to rev quickly. I will guarantee that Tim Farrs TRX450 will have TI valves. Kevin Windhams Works Connection CRF450 has TI valves and he is one of the only guys this year that has been able to beat Carmicheal outdoors.

You took the words right out of my mouth.

[jmarwiseman]

I just finished putting the second set of intakes in my CRF....it doesnt seem to cause any conserns with the seats just cuts a groove in the valve and sucks it up into the head.....then the bike wont start because the lash is too tight.....I wonder if steel valves would cause more wear to the head?

[nhbanshee]

If you keep eating up valves because they are cutting into the seat, you need to install stiffer valve springs. They are cutting into the seat because they are not following the cam's lob profile. The spring isnt holding it tight to the cam, and the valves are slamming closed, (this is also know as valve float).

Another reason for using TI valves that no one has mentioned, is that they can handle alot more heat than a steel valve will. As these new 4 strokes get higher, and higher performance levels, they also generate higher and higher combustion camber temps. TI valves wont burn or warp like steel valves will.

[jmarwiseman]

no problems with the seats just the valve....and they are TI....

a buddy of mine that trail rides his crf dirtbike has had to have head work and valve work done on his several times. Kinda makes me wonder how well these 450's are really gonna do.:confused:

It's up for sale now and he bought a c-dale..LMAO

[jmarwiseman]

Originally posted by Rico
a buddy of mine that trail rides his crf dirtbike has had to have head work and valve work done on his several times. Kinda makes me wonder how well these 450's are really gonna do.:confused:

It's up for sale now and he bought a c-dale..LMAO



thats me goof ball:macho

Originally posted by jmarwiseman
thats me goof ball:macho

DOH...........:o

We always call ya chit fer brains at the shop when your not around, wasn't used to seein your real name... :D

[jmarwiseman]

shew hope thats all they call me