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just got my 06

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I'm gonna try it at my local track tomorrow,been cruising it around the desert trying to break it in slowly.The first thing I noticed is the forks seem straight down,It makes my son's 05 crf 250 feel like a chopper.the power is pretty smooth,I rolled it on once and it definitely felt faster then my 04 crf450,cant wait to get this baby on the track.

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you already messed up on break in :banghead: break it in like your going too ride it you will have less problems out of it :banghead:

I fully agree, you bike is gonna be slower now and wear out quicker. Too late now, but next time do some research and ask around. You have to just warm it up and then load that bike up hard, not thrash it, but give it a good hard ride.

mototune has a website telling you in more detail.

But anyways back to the bike, I cant wait for a ride report, I think they might be pushing for 450 bike of the year, cant wait to see some shootouts.

Glad you got yellow, your gonna love it

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Just got back from the track,this thing rails,I couldn't really push it too hard,I haven't ridden in three months,forarms were rock hard afterabout 1/2 a lap! it loves the inside tho,there's a long strataway at my local track(a.v.fairgrounds)I got to pin it a few times,pulls real hard in 3rd and 4th(kinda like 03yzf450) but very manageable in tite stuff.at first i was stalling it a lot but set up the idle and took care of that.I was going to swap bikes with my bud for a few laps(06crf)but somebody got hurt pretty bad & they shut down for a while& I had enough,cant wait to get rid of my armpump so I can go for more then 2 laps!

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What´s the website mototune? sounds interesting...

So you say the bike will be better if you brake it in a bit harder??

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This is a bit of it, go check out his site for pictures and more info.

Im sure this has been discused many times


This is a very controversial topic !!

I wrote "Break-In Secrets" after successfully applying this method

to approximately 300 new engines, all without any problems whatsoever.

Links to this article now appear on hundreds of motorsports discussion forums from all over the world. The reason is that over time, large numbers of people have done a direct comparison between my method and the owner's manual method, and the news of their success is spreading rapidly.

The results are always the same... a dramatic increase in power at all RPMs. In addition, many professional mechanics have disassembled engines that have used this method, to find that the condition of the engine is much better than when the owner's manual break-in method has been used.

The thing that makes this page so controversial is that there have been many other break-in articles

written in the past which will contradict what has been written here.

Several factors make the older information on break-in obsolete.

The biggest factor is that engine manufacturers now use a much finer honing pattern in the cylinders than they once did. This in turn changes the break-in requirements, because as you're about to learn, the window of opportunity for achieving an exceptional ring seal is much smaller with

newer engines than it was with the older "rough honed" engines.

In addition, there is a lot less heat build up in the cylinders from ring friction

due to the finer honing pattern used in modern engines.

The other factors that have changed are the vastly improved metal casting and machining

technologies which are now used. This means that the "wearing in" of the new parts

involves significantly less friction and actual wear than it did in the distant past.

How To Break In Your Engine For

More Power & Less Wear !

One of the most critical parts of the engine building process is the break in !!

No matter how well an engine is assembled, it's final power output is all up to you !!

Although the examples shown here are motorcycle engines,

these principles apply to all 4 stroke engines:

Street or Race Motorcycles, Cars, Snowmobiles, Airplanes & yes ...

even Lawn Mowers !!

( regardless of brand, cooling type, or number of cylinders. )

These same break in techniques apply to both steel cylinders and Nikasil, as well as the ceramic

composite cylinders that Yamaha uses in it's motorcycles and snowmobiles.

What's The Best Way To Break-In A New Engine ??

The Short Answer: Run it Hard !

Why ??

Nowadays, the piston ring seal is really what the break in process is all about. Contrary to popular belief, piston rings don't seal the combustion pressure by spring tension. Ring tension is necessary only to "scrape" the oil to prevent it from entering the combustion chamber.

If you think about it, the ring exerts maybe 5-10 lbs of spring tension against the cylinder wall ...

How can such a small amount of spring tension seal against thousands of

PSI (Pounds Per Square Inch) of combustion pressure ??

Of course it can't.

How Do Rings Seal Against Tremendous Combustion Pressure ??

From the actual gas pressure itself !! It passes over the top of the ring, and gets behind it to force it outward against the cylinder wall. The problem is that new rings are far from perfect and they must be worn in quite a bit in order to completely seal all the way around the bore. If the gas pressure is strong enough during the engine's first miles of operation (open that throttle !!!), then the entire ring will wear into

the cylinder surface, to seal the combustion pressure as well as possible.

The Problem With "Easy Break In" ...

The honed crosshatch pattern in the cylinder bore acts like a file to allow the rings to wear. The rings quickly wear down the "peaks" of this roughness, regardless of how hard the engine is run.

There's a very small window of opportunity to get the rings to seal really well ... the first 20 miles !!

If the rings aren't forced against the walls soon enough, they'll use up the roughness before they fully seat. Once that happens there is no solution but to re hone the cylinders, install new rings and start over again.

Fortunately, most new sportbike owners can't resist the urge to "open it up" once or twice,

which is why more engines don't have this problem !!

An additional factor that you may not have realized, is that the person at the dealership who set up your bike probably blasted your brand new bike pretty hard on the "test run". So, without realizing it, that adrenaline crazed set - up mechanic actually did you a huge favor !!

Here's How To Do It:

There are 3 ways you can break in an engine:

1) on a dyno

2) on the street, or off road (Motocross or Snowmobile.)

3) on the racetrack

On a Dyno:

Warm the engine up

completely !!

Then, using 4th gear:

Do Three 1/2 Throttle dyno runs from

40% - 60% of your engine's max rpm

Let it Cool Down For About 15 Minutes

Do Three 3/4 Throttle dyno runs from

40% - 80% of your engine's max rpm

Let it Cool Down For About 15 Minutes

Do Three Full Throttle dyno runs from

30% - 100% of your engine's max rpm

Let it Cool Down For About 15 Minutes

Go For It !!

Frequently asked Question:

What's a dyno ??

A dyno is a machine in which the bike is strapped on and power is measured.

It can also be used to break in an engine.

NOTE: If you use a dyno with a brake, it's critical during break - in that you allow the engine to decelerate fully on it's own. (Don't use the dyno brake.) The engine vacuum created during closed throttle deceleration sucks the excess oil and metal off the cylinder walls.

The point of this is to remove the very small (micro) particles of ring and cylinder material which are part of the normal wear during this process. During deceleration, the particles suspended in the oil blow out the exhaust, rather than accumulating in the ring grooves between

the piston and rings. This keeps the rings from wearing too much.

You'll notice that at first the engine "smokes" on decel, this is normal, as the rings haven't sealed yet. When you're doing it right, you'll notice that the smoke goes away after about 7-8 runs.

Important Note:

Many readers have e-mailed to ask about the cool down, and if it

means "heat cycling" the engine.

No, the above "cool down" instructions only apply if you are using a dyno machine to break in your engine. The reason for cool down on a dyno has nothing to do with

"Heat Cycles" !!!

Cool Down on a dyno is important since the cooling fans used at most dyno facilities are too small to equal the amount of air coming into the radiator at actual riding speeds. On a dyno, the water temperature will become high enough to cause it to boil out of the radiator after

about 4 dyno runs. This will happen to a brand new engine just as it will

happen to a very old engine.

(Always allow the engine to cool down after 3 runs whenever you use a dyno.)

If you're breaking your engine in on the street or racetrack, the high speed incoming air will keep the engine temperature in the normal range.

(In other words, you don't have to stop by the side of the road to let your bike cool down.)

What about "heat cycling" the engine ??

There is no need to "heat cycle" a new engine. The term "heat cycle" comes from the idea that the new engine components are being "heat treated" as the engine is run. Heat treating the metal parts is a very different process, and it's already done at the factory before the engines are assembled. The temperatures required for heat treating are much higher than an engine will ever reach during operation.

The idea of breaking the engine in using "heat cycles" is a myth that came from the misunderstanding of the concept of "heat treating".

On the Street:

Warm the engine up completely:

Because of the wind resistance, you don't need to use higher gears like you would on a dyno machine. The main thing is to load the engine by opening the throttle hard in 2nd, 3rd and 4th gear.

Realistically, you won't be able to do full throttle runs even in 2nd gear on most bikes without exceeding 65 mph / 104 kph. The best method is to alternate between short bursts of hard acceleration and deceleration. You don't have to go over 65 mph / 104 kph to properly load the rings. Also, make sure that you're not being followed by another bike or car when you decelerate, most drivers won't expect that you'll suddenly slow down, and we don't want

anyone to get hit from behind !!

The biggest problem with breaking your engine in on the street (besides police) is if you ride the bike on the freeway (too little throttle = not enough pressure on the rings) or if you get stuck in slow city traffic. For the first 200 miles or so, get out into the country where you can vary the speed more

and run it through the gears !

Be Safe On The Street !

Watch your speed ! When you're not used to the handling of a new vehicle, you should accelerate only on the straightaways, then slow down extra early for the turns. Remember that both hard acceleration and hard engine braking (deceleration) are equally important during the break in process.

On the Racetrack:

Warm the engine up completely:

Do one easy lap to warm up your tires. Pit, turn off the bike & check for leaks or

any safety problems. Take a normal 15 minute practice session

and check the water temperature occasionally. The racetrack is the perfect environment to break in an engine !! The combination of acceleration and deceleration is just the ticket for sealing the rings.

Go For It !!

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