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5spoke

How much HP has the 450 got?

21 posts in this topic

I was at the honda /suzuki dealer today (it's the closest and I needed some filter oil). So the parts guy say's my bike has like 60hp. I said no way. So how much hp does it have? :)

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I have a 2004 WR450 and it pretty darn strong... I would guess between 45 and 50hp at sea level... 60HP is bit too much I think.

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My '03 YZ450 dyno'd at just a hair under 50hp when it was stock and almost broken in, an stock '03 CRF450 had about .5hp more (both run side by side). If you believe that the WR's are slightly detuned, then guess probably upper 40's. If you don't believe that, then go with 50. I know it takes some work to get to 60hp, 70hp is attainable, but for quite a bit more $$.

Paul

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Roughly $6K in an engine builder's pocket. I don't know what all is involved, just talked to a few people that have done it. At least they claimed 70hp, I know they run their 'cheap'(relatively) stock motors for many events, save the expensive motor for the events that pay money.

That's so far beyond me, the stock hp is plenty for me at this point in my learning.

Paul

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I have an old magazine article where they tested the 2003 YZ450F with various exhausts. With the stock pipe it said 46.9 hp at 8500rpm's. That is rear-wheel hp, not crankshaft.

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I know a guy that flat track races a yz426f thats been bored to a 450cc. If runs aftermarket cams, ported head and about 13.5:1 on methanol. I believe it made 60hp on the dyno at sea level. It's just a shame that the guys mechanic put the piston in backwards on the last freshen-up and it broke all the valves before it even started :)

Hamish

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My bike runs much much much stronger than it did stock.

I almost brought the bike back cause it seemed like a real wheezer -especially after riding cr500's for the past 12 years.

Now that I yz'd it I am almost completely satisfied.

BTW the airbox , exhaust , and jetting made the biggest difference.

I'd guess that a stock bike right out of the showroom makes about 10 HP less than the YZ450, or 40HP at the back tire.

Thats what it felt like compared to the way my bike is set up now.

Stock it felt like a fast 125 , now the 250 2 smokers can't catch me!!

For more info read my signature.

:)

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For what it's worth,

The certificate of origin on a 2004 Chev P.U. with the 5.3 liter V8 engine says 44.8 hp sae.

The certificate of origin on a 2004 Chev P.U. with a 6.6 liter Duramax Diesel says 52.7 hp sae.

You guys can't tell me that my WR 450 has more ponies than my Duramax!!!!!!!!

By the way, I work at a GM Dealership so I peeked at the Certificates of origin. :thumbsup:

Jim

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For what it's worth,

The certificate of origin on a 2004 Chev P.U. with the 5.3 liter V8 engine says 44.8 hp sae.

The certificate of origin on a 2004 Chev P.U. with a 6.6 liter Duramax Diesel says 52.7 hp sae.

You guys can't tell me that my WR 450 has more ponies than my Duramax!!!!!!!!

By the way, I work at a GM Dealership so I peeked at the Certificates of origin. :thumbsup:

Jim

What the *$% are you smoking at that dealership?? :devil:

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My buddy dino'd a 03 WR450...

Thanks, but that's not what I am looking for. I want to compare the cert of orig's HP declaration for the 04 WR450F with the 04 YFZ450. It's trvial, but I wanted to see if Yamaha declares more horsepower with the WR's 63.4mm stroke versus the YFZ450's 62.0mm stroke.

Thanks anyway. Hopefully, someone can provide the information I'm looking for.

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For what it's worth,

The certificate of origin on a 2004 Chev P.U. with the 5.3 liter V8 engine says 44.8 hp sae.

The certificate of origin on a 2004 Chev P.U. with a 6.6 liter Duramax Diesel says 52.7 hp sae.

You guys can't tell me that my WR 450 has more ponies than my Duramax!!!!!!!!

By the way, I work at a GM Dealership so I peeked at the Certificates of origin. :thumbsup:

Jim

What the *$% are you smoking at that dealership?? :devil:

I own a Duramax - it is 6.6 lliters - multiply that by the certificate of origin, and you get 347.82 - sounds about right.

Multiply 60 x .450 and you get 27 hp. hmm doesnt sound right :awww:

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