Thoughts on 2021 yz450f performance upgrades and what to get

StevenWillDoIt
Edited Date/Time 12/17/2020 12:05pm
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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kb228
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kb228 12/1/2020 8:22am
12/1/2020 8:22am
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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Rider 5280
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Rider 5280 12/1/2020 8:54am
12/1/2020 8:54am Edited Date/Time 12/1/2020 9:00am
Be sure to try all the ECU maps posted on Yamaha's site + Keefer's:
https://www.yamahamotorsports.com/motocross/pages/yamaha-power-tuner-sm…
https://www.keeferinctesting.com/motocross-testing/2020/9/23/optional-2…
https://www.keeferinctesting.com/motocross-testing/2019/9/18/2020-yamah…

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-te…

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-skin…
fourfourone
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fourfourone 12/2/2020 8:23am
12/2/2020 8:23am
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...
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.
this.
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mx317
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mx317 12/2/2020 9:09am
12/2/2020 9:09am
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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Rickyisms
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Rickyisms 12/2/2020 9:24am
12/2/2020 9:24am
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 pegs...
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?
Fastway might have some lower pegs.
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Rider 5280
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Rider 5280 12/2/2020 9:49am
12/2/2020 9:49am Edited Date/Time 12/2/2020 9:51am
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&…

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

*** I have a GYTR tall seat for sale if you're interested ***
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mx317
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mx317 12/2/2020 1:43pm
12/2/2020 1:43pm
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...
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&…

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

*** I have a GYTR tall seat for sale if you're interested ***
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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Motofinne
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Motofinne 12/3/2020 2:06am
12/3/2020 2:06am
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.
Mr. Robinson 12/3/2020 11:44am
12/3/2020 11:44am
This is where you want to start on the Yamaha's. Then dial in your mapping.






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Rider 5280
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Rider 5280 12/3/2020 12:12pm
12/3/2020 12:12pm Edited Date/Time 12/3/2020 12:14pm
Appears to be this company:
https://www.vhm.nl/en/page/vhm-parts-info/air-intakes#Airintakes
https://www.vhm.nl/en/page/vhm-parts-info/air-intakes#Airboxcovers

YZ450F specifics here:
https://www.vhm.nl/en/catalog/engine-parts/filter-parts/air-intakes-air…
https://www.vhm.nl/en/catalog/engine-parts/filter-parts/air-intakes-air…

Thanks for the leads Mr. Robinson!
Mr. Robinson 12/3/2020 12:58pm
12/3/2020 12:58pm Edited Date/Time 12/3/2020 12:59pm
Rider 5280 wrote:
Appears to be this company:
https://www.vhm.nl/en/page/vhm-parts-info/air-intakes#Airintakes
https://www.vhm.nl/en/page/vhm-parts-info/air-intakes#Airboxcovers

YZ450F specifics here:
https://www.vhm.nl/en/catalog/engine-parts/filter-parts/air-intakes-air…
https://www.vhm.nl/en/catalog/engine-parts/filter-parts/air-intakes-air…

Thanks for the leads Mr. Robinson!
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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Chaser503
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Chaser503 12/3/2020 12:59pm
12/3/2020 12:59pm
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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Rooster#329
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Rooster#329 12/4/2020 2:14pm
12/4/2020 2:14pm
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.
Rider 5280
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Rider 5280 12/4/2020 2:38pm
12/4/2020 2:38pm Edited Date/Time 12/4/2020 3:34pm
Ooooh … can you elaborate on the JBI advantages?
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Rooster#329
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Rooster#329 12/4/2020 7:51pm
12/4/2020 7:51pm
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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Yeti831
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Yeti831 12/5/2020 12:23pm
12/5/2020 12:23pm
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 pegs...
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?
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.
mx317
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mx317 12/5/2020 12:54pm
12/5/2020 12:54pm
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 pegs...
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?
Yeti831 wrote:
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...
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.
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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Bearuno 12/6/2020 10:20pm
12/6/2020 10:20pm Edited Date/Time 12/6/2020 10:26pm
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.
Yeti831
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Yeti831 12/6/2020 11:33pm
12/6/2020 11:33pm
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 pegs...
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?
Yeti831 wrote:
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...
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.
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 interest...
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.
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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Rider 5280
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Rider 5280 12/7/2020 12:46am
12/7/2020 12:46am Edited Date/Time 12/12/2020 11:54am
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.
Timo_2824
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Timo_2824 12/9/2020 6:23am
12/9/2020 6:23am
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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Rider 5280
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Rider 5280 12/14/2020 12:34pm
12/14/2020 12:34pm Edited Date/Time 12/14/2020 12:35pm
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):



... 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-b…):


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mx317
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mx317 12/14/2020 1:26pm
12/14/2020 1:26pm

2021 YZ250F has vents stock.

Chaser503
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Chaser503 12/17/2020 12:05pm
12/17/2020 12:05pm
Curious if the 450FX fuel tank and kick stand would fit on 450F?

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