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icufo

2012 YZ450 Speeding Bullet

27 posts in this topic

Bought a brand new YZ 450 this week and was wanting to know what the best over-the-counter parts or accessories were for this bike. Im trying to get the maximum amount of power for all out hauling a-- looking for results over 100mph been a while since I have messed with a single what's it gonna take and how much horses do you think I could get.

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Desert racing in Illinois? Cornfield supermoto? Ice racing on lake Michigan? What do you have planned for this bike?

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The easiest mod(s) are a pipe, possibly an aftermarket air filter, a different fuel map - which will require some dyno time to really get it sorted, unless you want to use your "butt dyno" and run with that. On top of that stuff there's always high compression pistons, thinner head gaskets, port/polish work, race gas etc. etc.

If you're looking for 100+ mph, you'll also need gearing. I'd take a look around on some super-moto sites and see what guys are using.

I don't think adding 10 rwhp would be too much work, I'd guess you'd be looking at some motor mods but nothing too crazy.

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I don't think adding 10 rwhp would be too much work, I'd guess you'd be looking at some motor mods but nothing too crazy.

I have news for you. Going from 50+ rwhp, where the bike starts out, to 60+ is a huge undertaking, regardless of whatever claims are made otherwise. If you want 60 or more HP from a YZ450, plan on spending large sums of time and money.

To the OP, why do you want 100 mph?

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We flat track and road race was wondering what a gytr head kit would do and a pipe thinking about jemco keeping the rest stock for reliability gearing is alway a must 1st time messing with new fuel injection have factory yamaha gytr tuner, ideas on any other thing is welcome maybe you have A better idea we always had 2strokes.

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One idea would be to throw some punctuation in there so we don't have to work so hard to read the posts you put up.

The GYT-R head kit is a good place to start, but for 1/2 mile and longer tracks, to really bang heads with the big boys, you will need to be doing something along with that. If you want specific advice from a specialist in that sort of racing, contact Ron Hamp. An oversize carb and cams to go with the head would be a good beginning, and while the GYT-R Power Tuner is useful, i think for something that serious, the ignition unit from GET would deserve a look.

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We were just wondering what the max that somebody has gotten out of one of these things. Our last resort would be Woody Kyle.

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well we dont really want to touch the bottom end, we really just want to know what the parts that you can get from yamaha will do for you power wise

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We were just wondering what the max that somebody has gotten out of one of these things.
At the last conversation we had about the new engine, I think Ron and TUF Racing had a Gen3 450 up to 63 rwhp in flat track trim, but it's been a while, and he may have improved on that. He usually does.

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ICUFO, IMO, your being unrealistic, your looking to make major HP gains, but only by buying OTS parts. Then expecting hit 100mph (from what I understand on a regular basis).

Do you really understand how fast 100mph is? Do you really understand that to gain some sort of magical number in HP it will take more then a few bolt on goodies.

Next you will be looking for 100+ hrs out of a top end using 87 octane pump gas!

I think your trolling!

To do what your want, your going to need major amounts of cash to build it, then maintain it, period.

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The Gytr Ported kit already comes with the race cams. So if we were just buying the GYTR add ons how much power would it add?

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Star racing 450s are at 64-65hp. GYTR head, GET ignition, Cosworth Hi comp piston, Pro-circuit exhaust and vp race fuel. Not sure exactly what else they are using, just told that they had 65hp without splitting the cases. I'm sure that JGRMX or Ron Hamp could also build you a engine that would fit the bill.

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I know you think we are a little stupid

a stock yz450f with proper gearing should get over 95 easy

OTS maybe yes but gytr kit is not a stock item factory yamaha race kit just like the old yamaha factory road racers had ow01's

did i mention we are also trying to get reliabilty more compression harder on bottom end

Edited by icufo

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Quick way to pick up top end with a warmed over motor: Install Wr 4-5th gears....good stock close ratio 1-2-3, for squirting off the line....since a stocker pulls the WR gears, the s-it hot motor should have no problem with 11% taller 4th, and a 17% taller 5th....

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I have news for you. Going from 50+ rwhp, where the bike starts out, to 60+ is a huge undertaking, regardless of whatever claims are made otherwise. If you want 60 or more HP from a YZ450, plan on spending large sums of time and money.

To the OP, why do you want 100 mph?

#1) Who cares why he wants to do it, he's asking a question. If you don't want to answer.... don't.

I guess I should've said

I don't think adding 8 rwhp would be too much work
. And FYI, you don't necessarily have to add 10 hp to get into the 60+ range as throwing in a set of stage 3 cams won't give you more power but will increase your peak rwhp.

I'd think for around $2000 you could get into the 60's, which would be around a 7 hp increase.

$599 Akrapovic full system - E-bay Item number: 280795866788 should add approximately 2 hp, putting you around 55. A GYTR head/cams can be had for $1840, I'm guessing that would be good for more than a few HP and is an easy swap. A lightly used original head will sell for around $600, subtract that from the $1840 and your GYTR head cost you $1200. Add some VP race fuel and you'll see those kind of numbers.

I don't think $2000 is a big deal if you're looking to gain that kind of HP. That's my (subjective) opinion.

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#1) Who cares why he wants to do it, he's asking a question.

So am I. Is there a problem with that?

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So am I. Is there a problem with that?

He's asking about increasing the performance of his new bike, which is one of the reasons forums like this exist. You asked why he wanted what he does, the "why" part doesn't matter.

And if you really want to, I don't think it's really that hard to figure out "why" anyone would want 100+ mph and an increase in rwhp. It's not that hard for me anyway.

I'll try to offer an opinion/help regardless of what the OP wants to do with his bike, asking "why" implies that the OP needs to explain himself - which he doesn't.

Anyway, this conversation matters as much as the "why" in that it doesn't. I'd still think that for around $2000 he get get in/around the 60 rwhp mark.

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