Thoughts on 2021 yz450f performance upgrades and what to get

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11/30/2020 9:35 PM

I’m looking for a Full exhaust system on the bike, yet I want the most bang for your buck and best for performance. Hoping that it won’t dull out the bottom end too much.

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12/1/2020 8:22 AM

I dont know the answer to your question but what i do know is a suspension revalve and ecu tune is more worth your money than a fancy pipe.

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12/1/2020 8:54 AM
Edited Date/Time: 12/1/2020 9:00 AM

Be sure to try all the ECU maps posted on Yamaha's site + Keefer's:
https://www.yamahamotorsports.com/motocross/pages/yamaha-power-tuner-smart-phone-app
https://www.keeferinctesting.com/motocross-testing/2020/9/23/optional-2020-2021-yamaha-yz450f-maps
https://www.keeferinctesting.com/motocross-testing/2019/9/18/2020-yamaha-yz450f-start-upbaseline-settingstipstricks

Regarding a good pipe/full exhaust system for the 2020 YZ450F, Doug Dubach is a good place to start given his affiliation with development of Yamaha 4-strokes going waaaay back. He focuses on the track feel of exhausts over the dyno curves (but of course uses those, too). In the case of the 2020-2021 YZ450F, he does NOT make a special head pipe. If you buy his full system, the head pipe is a dead copy of the stocker since he felt it was already good to go. Check out more info here:
https://motocrossactionmag.com/we-ride-doug-dubachs-gytr-dr-d-yz450f-tell-you-whats-inside/

Here are some more mods you might want to consider first:
http://pulpmx.com/2019/12/10/2020-yamaha-yz450f-top-5-mods/
https://www.keeferinctesting.com/offroad-testing/2020/10/19/slater-skins-air-box-cover-yamaha-yz250f450f

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12/2/2020 8:23 AM

kb228 wrote:

I dont know the answer to your question but what i do know is a suspension revalve and ecu tune is more worth your money than ...more

this.

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12/2/2020 9:09 AM

I would like to have lower footpegs for mine. Flo pegs are only 2mm lower even though they are listed as 12mm, but the newer pegs are already 10mm lower. Anybody?

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Take it to the limit, one more time!

12/2/2020 9:24 AM

mx317 wrote:

I would like to have lower footpegs for mine. Flo pegs are only 2mm lower even though they are listed as 12mm, but the newer ...more

Fastway might have some lower pegs.

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Unleaded tastes a little tangy. Supreme is kinda sour, and diesel tastes pretty good.

12/2/2020 9:43 AM

Yoshimura RS-12

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12/2/2020 9:49 AM
Edited Date/Time: 12/2/2020 9:51 AM

To MX317 ...

I use Fastway pegs in the lowest position on one of my buddy bikes (2007 CRF450R) for a friend who is 6'5" and 300 lbs. I also use a tall SDG seat + ROX handlebar risers (+ obviously heavier spring rates, etc.). This combo of mods/parts is EXCELLENT for him.

For you, the following setup might be the ticket:

(1) Fastway footpegs (I use the EVO 3s, they are a nice product)
https://fastway.zone/product-category/footpegs/?year_=2021&make=YAMAHA&model=YZ450F&orderby=menu_order

(2) GYTR tall seat for the 2021 YZ450F
https://www.keeferinctesting.com/offroad-testing/2019/10/7/yz450f-gytr-tall-seat

*** I have a GYTR tall seat for sale if you're interested ***

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12/2/2020 1:43 PM

Rider 5280 wrote:

To MX317 ...

I use Fastway pegs in the lowest position on one of my buddy bikes (2007 CRF450R) for a friend who is 6'5" and ...more

Thanks! I ended up with a Guts 25mm taller seat. I wish someone made brackets like Systemtech for the newer Yamahas. https://www.systemtechracing.com/product_p/55-04.htm

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Take it to the limit, one more time!

12/3/2020 2:06 AM

The current YZ450F is fast as hell, for me almost too fast. I would put money into getting the suspension setup for you and after that get a Vortex mapped ECU from Twisted Development or XPR. If you still have money left, get a slip-on for looks.

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Current fleet of two wheeled vehicles:
- KTM SX 250 2020
- Suzuki GSX-R 600 K7 track spec
- Canyon Sender CF 8.0 2018 Downhill
- Canyon Spectral:ON 7.0 2019 EMTB
- White GX Pro 20 Gravel

12/3/2020 11:44 AM

This is where you want to start on the Yamaha's. Then dial in your mapping.


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12/3/2020 12:12 PM
Edited Date/Time: 12/3/2020 12:14 PM

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12/3/2020 12:17 PM

Another airbox option (domestic, less expensive):
https://nihiloconcepts.com/collections/carbon-fiber

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12/3/2020 12:29 PM
Edited Date/Time: 12/3/2020 12:30 PM

The NoToil kit is what I use. The Twin Air filters fit the cage perfect if you prefer. Rocky Mountain has them in stock for less that $50.
https://notoil.com/product/super-flo-kit-sfk18053/

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Take it to the limit, one more time!

12/3/2020 12:58 PM
Edited Date/Time: 12/3/2020 12:59 PM

Yeah, the point of my post is that the air box / intake area is proving to be where the best bang for the buck seems to be coming from on the Yamaha's. Once you let them breath they start to come to life.

The parts I have shown here are the VHM parts, but there are other worthy options, although I'm not aware of anyone else making an air horn like they have.

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12/3/2020 12:59 PM

I have the Fastway Evo III pegs on my 2020 yz450f. Had them on my 2015 kx450f previously. Bolted right over. They do make a difference. Have GUTS 25mm tall / hard density seat on order. The seat to peg distance is tight for those that have longer legs.

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12/4/2020 2:14 PM

JBI spring perch 2.0. I put these on my 2020 and I can’t believe how good they work. I wouldn’t bother with I revalve after installing the spring perch.

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12/4/2020 2:38 PM
Edited Date/Time: 12/4/2020 3:34 PM

Ooooh … can you elaborate on the JBI advantages?

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12/4/2020 7:51 PM

You run less oil in the forks and you have to back the compression out, I think I had to come out 6-8 clicks on compression. They absorb bumps and rough stuff way better and are about impossible to bottom out on hard hits. I had cone valves on my ktm and this made my KYB forks just as good if not better and a lot less expensive.

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12/5/2020 12:23 PM

mx317 wrote:

I would like to have lower footpegs for mine. Flo pegs are only 2mm lower even though they are listed as 12mm, but the newer ...more

System Tech Racing makes -12mm peg mounts for $125. This allows you to run whatever pegs you want without being selective to pegs that have lowering built in.

As far as mods, go with an exhaust if you really want weight loss up top but I can’t stress much better mapping and suspension tuning would be from a performance standpoint.

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12/5/2020 12:54 PM

mx317 wrote:

I would like to have lower footpegs for mine. Flo pegs are only 2mm lower even though they are listed as 12mm, but the newer ...more

Yeti831 wrote:

System Tech Racing makes -12mm peg mounts for $125. This allows you to run whatever pegs you want without being selective to ...more

They are not yet making them for the later model YZ450F. I talked to System Tech this week and was told he was getting some interest in them and he might make some. He said he needed to make a run of 200 and would hope to have several sold to recoup his investment.

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Take it to the limit, one more time!

12/6/2020 8:10 PM
Edited Date/Time: 12/6/2020 8:22 PM

VHM carbon fiber airbox cover:



Dyno data:
https://www.vhm.nl/en/page/dyno-tests#YZ450F

Impressive gains!
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12/6/2020 8:27 PM

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12/6/2020 10:20 PM
Edited Date/Time: 12/6/2020 10:26 PM

As some posters have said - size the bike to fit you, be it pegs, seat / bars.

Spring it to suit you. You'd have to have a dud suspension build ex factory to need much attention, initially, to the YZFs suspension, in terms of a re-valve.

There seems to be a good argument (I'd call it pre-emptive) for some sort of Airfilter kit. For me, it would be mainly about Clean, Clean Air, and, hopefully, ease of maintenance. Yes, the above Dyno graph looks good, but, and this is Not meant as an insult to the OP (or, anyone else that goes for 'more' power from their 450) , can you use all of the HP and Torque of your new 450???

Pipe - If feel the same about that. Me, I'd go for something quieter, especially if you can save some weight.

***The Absolute Key , is learning to use, and Make Use of, Yamahas 'Phone Tuner. It is, amazing. No, I don't own a YZF of any size, but riding mates bikes, and trying various settings, has been an absolute Revelation of the benefits of Technology. ***

I can only think Yamaha has some sort of 'lock' / enough patents on it (or very key aspects of it), for the other companies Not to have done the same thing. And KTMs set up is nowhere near what Yamaha customers get, in terms of ease of use, and, well, not costing them a flamin motza after purchase of the bike. Though, the "Not Designed Here" mentality of companies, especially Japanese ones, may be a big part of it.

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12/6/2020 11:33 PM

mx317 wrote:

I would like to have lower footpegs for mine. Flo pegs are only 2mm lower even though they are listed as 12mm, but the newer ...more

Yeti831 wrote:

System Tech Racing makes -12mm peg mounts for $125. This allows you to run whatever pegs you want without being selective to ...more

mx317 wrote:

They are not yet making them for the later model YZ450F. I talked to System Tech this week and was told he was getting some ...more

My apologies, i didn’t know Yamaha changed their mount design. At least he’s aware of it and hopes to do a run.

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12/7/2020 12:46 AM
Edited Date/Time: 12/12/2020 11:54 AM

When getting all excited about more power, I should have mentioned that I live up at 5,000 feet and ride up to 14,000 feet, so I am looking for every opportunity to get some back. I often forget what mad power at near sea level felt like (lived in AZ for 14 years).

"As a general rule, a naturally aspirated combustion engine will lose 3% of its power for every 1,000 ft of elevation gain." So at a minimum, I am down ~15% ... and down 42% at 14,000 feet!

So ... good point, be careful with too much power when conditions permit. It's often more of a liability than benefit.

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12/9/2020 6:23 AM

If you make more power to can go to a higher gearing ratio and spread it out, makes each gear pull longer. After I added a 290 bb to my old 250F, I went to a 14 tooth countershaft sprocket. That is a definite advantage on straights, much less shifting.

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12/14/2020 12:34 PM
Edited Date/Time: 12/14/2020 12:35 PM

For those who want to build their own spare modified airbox to try, it's a ~ $25 purchase from Rocky Mountain ATV.

Here's what you need to buy (Uni Airbox vents + blue OEM airbox cover for 2020 YZ450F):

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... and you'll end up with this (as described in another thread: https://www.vitalmx.com/forums/Tech-Help-Race-Shop,42/YZ250F-2019-air-box-mods,1357708):

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12/14/2020 1:26 PM


2021 YZ250F has vents stock. Photo
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Take it to the limit, one more time!

12/16/2020 10:52 AM

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