Comparing the 450r & YFZ450 by the numbers

[400exTN]

TRX450R
Engine 449 liquid-cooled
Bore & Stroke 94x64.8
Compression 10.5:1
Valve Unicam, four valve
Carburetion 42mm w/ TPS
Front Suspension 8.4 travel
Rear 9.0 travel
Length 72.6
Width 46.3
Height 43.6
Wheelbase 49.2
Seat Height 32.6
Ground Clearance 4.2
Dry Weight 350
Fuel Capacity 3.2

YFZ450
Engine 439 liquid-cooled
Bore & Stroke 95x62
Compression 11.9:1
Valve Titanium 5 valve DOHC
Carburetion FCR 39 w/TPS
Front Suspension 9.1
Rear 10.1
Length 72.4
Width 46.1
Height 42.9
Wheelbase 50.4
Seat Height 31.5
Ground Clearance 4.4
Dry Weight 350
Fuel Capacity 2.6

Pros
$1000 to $1,200 less for the stroked crank
Hondas proven reliability

Cons
Will most likely need a different carb
Hi comp piston as well


Most racers will replace the A arms, Shocks, etc.. With aftermarket products.

How will the two compare with a pipe, air filter & jetting and a cam or cam mod and which is overall less expensive with this?

We got a quad that cost less, already has the stroked crank with a proven quality frame and handling.
Last point there's a reason many of the top pros transplant the CRF450 motor into aftermarket frames v/s the YZ450F motor.
Have a little faith. My guess is the 450r will be on par with the YFZ450 if not better.


Let me know if I missed anything

[trueblue450]

they will be similar..what will count is whos riding them!

[Sandgod4]

Originally posted by trueblue450
they will be similar..what will count is whos riding them!

Very true..


Low comp and 4 valves, stainless steel valves, shorter legs = less performance in stock form...The Yamaha is more impressive in my unbiased opinion.. I don't ride red or blue. I ride red, white, and blue...

[nismo]

y is everyone mad or dissapointed we havent even seen it perform i think people are just a little to quick to judge something that they dont know about (you dont know anything until you riding or try it) (there isnt any flame in this thread about it yet but there will be. maybe they will think before they speak)

[dirtriderex]

Because we now how the valves and engine works. If your really into engines you would know the power just by looking at specifications.

[ridered03]

will the yfz rev any faster cause its got a shorter stroke???

[CBW]

Originally posted by ridered03
will the yfz rev any faster cause its got a shorter stroke???

YFZ does rev out fast......and up to 10,750

[cheetah]

Seeing as the YFZ has DOHC, would it not respond better to mods?

[ROGERS]

Both engines will respond to mods. But remember the Honda is detuned more than the Yamaha, so it will show bigger gains with added components. There will only be so much one could do to squeeze more power out of either one. They will both end up making mid to high 40's hp when the average Joe Racer gets done with the usual modifications. It won't be so much how much hp you have that will win races, but how it is delivered.

a worked crf motor can have way more then 40hp.

why would you need a different carb on the trx450? throw an exhaust on it and k&n and that carb will make the bike come to life, add in a little porting, shave the head.....

I am glad that hona changed the comp on the motor instead of screwing with the timing on the motor like yamaha did.

also having that third ring on the piston and a larger wrist pin is awesome IMHO they beefed up the motor for the quad i dont think yamie beefed up engine parts, just the gears...(correct me if im wrong)

Having that 3rd piston ring may also make the crf capable of higher compression ratios.Of course they would most definately require full on race gas, like vp MR or better.

I'm really thinkin about gettin one...