Found some 450R Exhaust on Ebay With HRC Tip!!

[OldSchoolin86]

A stock 450R is, according to the 'net , around 33HP so our "little" 27HP has room to grow.
Sorry but I have to add this little "Jab" to the TRX450R AND YFZ450 crowd: Isn't an '86 ATC250R 38HP?

Blown's got a good source on this one, the 450's are making about 40hp. Your right on with saying the atc250r should be around 38hp but 27hp on the 350x is too high. That's a honda crank value, the real number is about 22hp.

[MO350X]

Blown's got a good source on this one, the 450's are making about 40hp. Your right on with saying the atc250r should be around 38hp but 27hp on the 350x is too high. That's a honda crank value, the real number is about 22hp.

Oops, I didn't specify.
Yes, 38 and 27 are both crankshaft numbers I've pulled from the 'net.

I've seen at least a half dozen different HP figures for the 450R.
Both crankshaft and rear wheel.
To add more confusion to the mix: different dyno's give different figures both in design AND in their conversion factors AND the numbers are easily swayed in favor of big sales (performance parts).

We'll just go with 40, then.

[OldSchoolin86]

Oops, I didn't specify.
Yes, 38 and 27 are both crankshaft numbers I've pulled from the 'net.

The 38 is the rear wheel that I've seen from 2 different sources. So to clairifly rear wheel hp:
85/86 ATC 250R = 38-39hp stock
85/86 ATC 350X = 22-23hp stock
450's = 39-40hp stock

[Blown 331]

The 38 is the rear wheel that I've seen from 2 different sources. So to clairifly rear wheel hp:
85/86 ATC 250R = 38-39hp stock
85/86 ATC 350X = 22-23hp stock
450's = 39-40hp stock

That sounds right on to me. I think the reason my 450 is so much faster than my 250 even though it looks like the 250 might have the power to weight ratio advantage is the 450 is rediculously choked from the factory. I mean it has to **** air through like a one inch diameter opening. It's making 40 rwhp with a 118 main jet! That should tell you right there it's choked bad. I have the HRC kit, which is a larger air snorkle, 185 min jet with new needle, open air box lid and a cam. Then I added the Yosh full system which made a huge difference. The ATC is stock with a ESR pipe, filter and jet kit.

[ClayW]

Well I guess I could get a 15hp adder carb like my neighbor got for his blaster. He said the guy guarenteed him 15hp. I could put one on my X and outrun the world. Lol Just kidding guys.

[Blown 331]

He said the guy guarenteed him 15hp. :

He probably meant 15 total horse power, not 15 additional horse power. ha ha

[ClayW]

Im sure. The guys a crack head. No clue what so ever

[MO350X]

My brother brought his 450R over to my house to test it on the road and store it.
It was pulling wheelies up to 4th gear!
He JUST installed the HRC kit and it sounds/runs psycho!!!

I'm serious.
He said it bounced off the rev-limiter so fast it was scary, compared to stock.
I thought it was leaning out on the top or something as he flew by.
Wow.

Can't wait to go to St. Joe with it and my trike on Sunday!!!

[ClayW]

Cool, I would love to try out a 450R. I ran the X pretty hard down the street earlier. She must like this cool air. Ran real good.

[Blown 331]

My brother brought his 450R over to my house to test it on the road and store it.
It was pulling wheelies up to 4th gear!
He JUST installed the HRC kit and it sounds/runs psycho!!!

I'm serious.
He said it bounced off the rev-limiter so fast it was scary, compared to stock.
I thought it was leaning out on the top or something as he flew by.
Wow.

Can't wait to go to St. Joe with it and my trike on Sunday!!!

Tell him to get a full exhaust system on it. Huge difference. I can hit the rev limiter in 5th gear, let off, it and pull the front end up for miles. I'm not exagerating either. I'll show you when you come out. My buddy is about 10 times better than me at doing that too, it's great. We pass cars doen the high way while riding wheelies.
I'm gonna try to make it to St. Joes on Sunday too. If I can find ya I'll show ya some 5th gear wheelies.

[MO350X]

Tell him to get a full exhaust system on it. Huge difference. I can hit the rev limiter in 5th gear, let off, it and pull the front end up for miles. I'm not exagerating either. I'll show you when you come out. My buddy is about 10 times better than me at doing that too, it's great. We pass cars doen the high way while riding wheelies.
I'm gonna try to make it to St. Joes on Sunday too. If I can find ya I'll show ya some 5th gear wheelies.

He's married with child so coughing up the jack for an exhaust is out of the question.
He was lucky momma turned loose of the $250 to get the HRC kit!
Bought through a "friend of the family".

I bet he'll be happy with the present improvements for a LONG time to come.

Man, you guys sound like wild riders.
We're probably like a bunch of old men compared to y'all.

If you get to St. Joe's, look for an '85 350X (or an '86 250R, haven't made up my mind yet), the red '04 450R and a red/white '04 Raptor.
There are two more 350X's scheduled to appear, too.
We SHOULD BE in a white '97 Ford Power Stroke 4WD standard cab long bed with a 2 axle trailer in tow.

Let's hope mother nature cooperates.
So far, so good!