06 yzf 450 vs 06 crf dyno graphs.

[Wayward Son]

had a local TT member bring his 06 yzf by the am for some dyno time.

i can say one thing for sure,the stock yzf jetting will be super lean at sea level. this bike ended up with a 48 pilot jet a 162 main here at 5500 ft.it will be able to stand a 158 in the summer.

at sea level you will need a 48 pilot and 170-172 main jet.

heres the graphs.yamaha got their act together on the motor for sure.

red = yzf

blue = crf

[shigbie]

Great info! The yamahe looks pretty linear but shirt of the bottom but looks to pull hard from mid on. The CRF has a fairly significant hiccup at 4500 rpm. What can be done with the jetting to resolve it?

[sirthumpalot]

Interesting! I just read a review that someone else posted and one of the riders said the CRF felt the strongest of the bikes. Makes me wonder if they made any jetting changes at all to the bikes for the test?

[Wayward Son]

Great info! The yamahe looks pretty linear but shirt of the bottom but looks to pull hard from mid on. The CRF has a fairly significant hiccup at 4500 rpm. What can be done with the jetting to resolve it?

thats just me opening the throttle too fast.this is a 4 th gear roll on.

[DPW]

at sea level you will need a 48 pilot and 170-172 main jet.

I will let you know how the 48/170 combo works tomorrow..

[Wayward Son]

thank you,i appreciate it.

i am shocked how lean they are on the pilot jet my self.

[Ga426owner]

thank you,i appreciate it.

i am shocked how lean they are on the pilot jet my self.

Burned how did this compare to the KXF450 or RMZ450 dyno runs?

Also what is the stock pilot jet in the YZF?

[grayracer513]

Very, very interesting. 50 is such a nice round number. Puts the lie to the published contention that the Honda has more power than the YZF, doesn't it? Shows you how deceptive the power can be when it's delivered in a smooth and usable fashion.

[johntt4]

The power's so close between the two that you could probably dyno a different pair and have the CRF come out on top.

[Wayward Son]

Burned how did this compare to the KXF450 or RMZ450 dyno runs?

Also what is the stock pilot jet in the YZF?

havent had any rmz or kxf taker on the free dyno runs.

stock pilot jet is a 42.

[Wayward Son]

Very, very interesting. 50 is such a nice round number. Puts the lie to the published contention that the Honda has more power than the YZF, doesn't it? Shows you how deceptive the power can be when it's delivered in a smooth and usable fashion.

the pre 06 yzf 450 were 46-48 hp.

[DPW]

havent had any rmz or kxf taker on the free dyno runs.

stock pilot jet is a 42.

Burned,

Any thoughts why the bike is jetted so lean from Yamaha?

[Wayward Son]

hard to say.its not uncommon for stock jetting to be way off.

[BIGBLUEKNIGHT]

the yzf lost a pony it used to be 51 horses for the 05s and 03 and 04 were 53 and the 426 made 55

[aford541]

I think the 05 was 44 or so stock, 06 is a good 10 % improvement.

[Ga426owner]

hard to say.its not uncommon for stock jetting to be way off.

I totally agree! Yamaha 4strokes have been notorious for incorrect or stock jetting results that are very much less than desirable...unless you live in Japan I guess....

I will say that the Honda CRF450 has had almost spot on stock jetting the last few years....

It is amazing the difference that the YZF has when the jetting is correct....

[Wayward Son]

the yzf lost a pony it used to be 51 horses for the 05s and 03 and 04 were 53 and the 426 made 55

lol,sorry fraid not.

[revolucien]

Varying elevation and climate in the U.S. make it so most will not have the correct jetting, kinda like expecting the bike to be sprung for each riders weight off the showroom floor. Thanks for the dyno's Burned, it's always good to see information from someone who isn't working for the moto mags. Maybe Yamaha can make another first when we get a low-weight, adjustable FI module.

[DPW]

Varying elevation and climate in the U.S. make it so most will not have the correct jetting, kinda like expecting the bike to be sprung for each riders weight off the showroom floor. Thanks for the dyno's Burned, it's always good to see information from someone who isn't working for the moto mags. Maybe Yamaha can make another first when we get a low-weight, adjustable FI module.

Yes I understand that, but usually in the past a turn of the fuel screw and everything was good. I went out a turn and a half on my '06 and it still popped real bad. I guess with my past bikes I just got lucky and the jetting was pretty darn close.

[revolucien]

Same here, I was lucky with my '02 and '04 both were fairly close at sea level. I have some friends who bought their bikes and it came with a little bag and a couple different size jets. The dealer told them the jetting was off and instead of fixing it they let the buyer fix it themselves. Seems to me the dealer should tune the bike before selling it, but I guess customer service ain't what it used to be.