What year had the most HP?

CRF450R.... what year made the most stock Horse power. the 2009, 10, or 11?

They are all within one or two horsepower.  The real question is which one can you hold the throttle to the pin for the longest on.  If you can keep that sucker wide open for more than 50% of the time on any MX track, even on a stock bike, you will get yourself an AMA #1 plate.

its always wide open. not tooting my own horn but its flattrack the sucker is pinned 90% of the time. im always in need of more HP. i only ice race (flat track). i grenaded my 2011. it was a built motor pushin around 63 horse. so basicaly im starting from scratch and wanna start with the highest horse posibal.

the 11' droped a valve at the drag strip. i was doin close to 110mph at 12.30sec 1/4 miles. im trying to get a motor back in that range for this season of ice. i think im going to go with an 09'. Seeing as thats really all that is avalibal on the used market and all i can really aford.

The stock '02 motor has the most power stock.

Every year after is detuned.

That is why the '02 cam is the go-to cam for an instant power upgrade.

But, as mentioned, quantity is usually second to quality. 

Even with constant WOT, it still has to go in and out of rpm ranges and power peaks, so porting, cam, exhaust, etc will all allow you to tailor the power for your needs.

The stock '02 motor has the most power stock.

Every year after is detuned.

That is why the '02 cam is the go-to cam for an instant power upgrade.

But, as mentioned, quantity is usually second to quality. 

Even with constant WOT, it still has to go in and out of rpm ranges and power peaks, so porting, cam, exhaust, etc will all allow you to tailor the power for your needs.

thanks for this! but im afraid the 02 wont work for me. because of the EFI 09,10,11 are the easyest to slap in there

Any of the EFI motors can make 64+hp in flat-track trim once the proper head porting, exhaust and mapping is performed. If you'd like some help, shot me your email address via PM...

thanks for this! but im afraid the 02 wont work for me. because of the EFI 09,10,11 are the easyest to slap in there

You can put the '02 in any year, if you bring over the cam tower with it.

I think he means he wants to use the EFI motor, not a carbed motor, nothing to do with the cam?

the 2009 engine made the most power with proper tuning the current engines will produce the same peak numbers with the 2009 TB the 2013 head can be ported for a better throttle response and the later TBs can be bored with good results the 2014 heads have been changed i have one coming as soon as they are released to evaluate if your running a 63 hp engine you need to put a good connecting rod in it or you will eventually have another bo of broken parts.

Bigborethumpers.com has the crank with a Carrillo Rod on it. That may help.

Nothing against carrillo i have used them but the only rod that i have never broke is the falicon by all rights the knife rod does not apear to be of the best desigh by engineering standards and its hard to convince some of the mechanics asembling pro mx bikes that this funky looking rod is just fine.it just works.How exactly does a posi trac rear end work on a plmouth work? it just does

the 2009 engine made the most power with proper tuning the current engines will produce the same peak numbers with the 2009 TB the 2013 head can be ported for a better throttle response and the later TBs can be bored with good results the 2014 heads have been changed i have one coming as soon as they are released to evaluate if your running a 63 hp engine you need to put a good connecting rod in it or you will eventually have another bo of broken parts.

 

Ron - Had an 09 & now own a 10 model as far as power goes they feel similiar with the 10 having a better map from the factory.    I actually like the 50mm tb for the fact it feels like it makes more power across the board than the 46mm version.    Read an article where KDub used the 50mm tb on his 11 because he liked it better for more power out put.     

I still use the 50mm TB on the CRF250R motors: bigger is better! It is easy to program around the TB size.

We have had the 46 TBs bored by injectioneering wade does nice work and has done them quickly for my riders i just dont care to do them myself every body says the same thing as you guys saying its a smoother delivery with better top end the curent KX450 i have done and making 63 hp has a injectioneering tapered TB and with my welded up head it makes tremendouse power down low..

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