New 15 kx450 questions

yz133rider
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Avondale, PA US
Edited Date/Time 4/16/2017 1:57pm
Just got a 15 that had maybe 15 minutes on it.

I'm b class, 220lbs first efi bike and first 450 in 10 years last one was an 03 yz450 that I hated lol. Too brutal, too fast, too tiring, shock sucked too.

Anyways got this bike and looking for suspension recommendations. Got settings for the forks from my local tuner, he suggested a 5.5 rear spring.


I'm temped to sell the forks and go onlins. Any advice? Air forks sound like extra drama and issues from everything I've read and talking even to the suspension shop. He converted his own forks to spring.

What says you guys? Any other set up tips. Going to get a chain as the stock one I'm sure will wear like rubber.

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down4moto741
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Fortworth, TX US
4/7/2017 2:37pm Edited Date/Time 4/7/2017 2:38pm
Go buy the showa 2016 kx250f internals and a spring and bottom plug from race tech and make it a sff with a spring just did my 15 total cost was $480 way worth it
down4moto741
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4/7/2017 2:42pm


Buy those 3 oem parts then get race techs spring and bottom plug
mxdevon
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Coeur D'Alene, ID US
4/7/2017 4:06pm
Dont get caught in the "Air forks suck" hype. At least gather some info on settings for you from reputable sources. Showa even has a TAC app for your phone with pressure recommendations. They can be made to be VERY good. My advice is get 3 slightly different overall pressure settings that are in the ballpark for you, test each one, pick your favorite and then fine tune the clickers from there just like you would with any fork. from there its set it and forget it. If you have some patience and spend a little time learning them you will be rewarded.

Granted not everyone will agree with me and if the extra time and setup steps are going to put a damper on your riding routine then yes ditch them and get the race tech conversion, all their parts and settings are generally spot on, but.......for what its worth I just went from a bike with sff spring forks to the TAC air fork and I think it is a much better fork. When properly dialed in that is.
mxb2
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Bowie, MD US
4/7/2017 4:37pm
yz133rider wrote:
Just got a 15 that had maybe 15 minutes on it. I'm b class, 220lbs first efi bike and first 450 in 10 years last one...
Just got a 15 that had maybe 15 minutes on it.

I'm b class, 220lbs first efi bike and first 450 in 10 years last one was an 03 yz450 that I hated lol. Too brutal, too fast, too tiring, shock sucked too.

Anyways got this bike and looking for suspension recommendations. Got settings for the forks from my local tuner, he suggested a 5.5 rear spring.


I'm temped to sell the forks and go onlins. Any advice? Air forks sound like extra drama and issues from everything I've read and talking even to the suspension shop. He converted his own forks to spring.

What says you guys? Any other set up tips. Going to get a chain as the stock one I'm sure will wear like rubber.

Gear it 13/50 or 51, add to designs chain guide, stock one lasts about 10 hrs. Factory connection has good suspension settings for that bike. Spring it for your weight,set sag. Try. It. Shd be pretty good.

The Shop

mx510
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Gig Harbor, WA US
4/7/2017 4:43pm
I have a 15 KX450F, you can get the TAC fork working just fine. I had mine valved and sprung with great results. These are my first air forks, if you go into it with an open mind the forks will be great.
Titan1
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Lehi, UT US
4/7/2017 4:43pm
I've got a 15 kx 450. I love the forks!

I'm an off road guy so I Had TBT revalve them, but they worked really good stock. Their recommended air pressure settings work awesome, and I only check the pressure of there is drastic air temp or altitude changes (I used to check them ever ride, but the pressures just didnt move that often, so I stopped doing it...in fact, I rode at 2000 ft and 70 degrees one weekend, the next was at 4500 and 50 degrees and the internal was right where I wanted it to be and the balance was only off by a few pounds).

In my opinion people that check them all the time are splitting hairs.

But give the air forks an honest shot before you spend money on something else, they just might surprise you!
yz133rider
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4/7/2017 7:41pm
Can't wait to ride it. Have a race this Sunday but not going to race it with the kawi, doesn't seem like a good idea first ride out to be at a race!
down4moto741
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4/7/2017 7:54pm
yz133rider wrote:
Can't wait to ride it. Have a race this Sunday but not going to race it with the kawi, doesn't seem like a good idea first...
Can't wait to ride it. Have a race this Sunday but not going to race it with the kawi, doesn't seem like a good idea first ride out to be at a race!
Race it ✊
Braap19
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Swansboro, NC US
4/7/2017 9:18pm
I love the air forks on the kawi, they're great.

Keep in mind that Kawasaki​ spent millions of dollars making that bike work the best it can work with air forks..
yz133rider
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4/9/2017 8:36am
We'll I'm here at budds creek waiting for my first moto and I brought the kawi. Slightly terrified!
Motofinne
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FI
4/9/2017 8:42am
Yeah don't go and get a spring kit without even testing the stock TAC air fork that comes with the bike.

Ride the bike for a few hours and test different settings(i'm sure you can find lots of info on the TAC fork).
crc245
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Yorba Linda, CA US
4/9/2017 9:20am
Best of luck YZ133 and enjoy the new ride today! As others have stated, test with the TAC forks before making your mind up on a spring conversion kit; air pressures, clicker changes, even oil heights (preferably with someone who has suspension experience watching the bike in action)...


If you're set on spring conversion, I'd suggest the SDI kit. It comes with an external preload adjuster and is priced competitively:

http://www.suspensiondirect.com/shop/dfastac-kit
yz133rider
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Avondale, PA US
4/16/2017 9:19am
So an update.

I'm running mellow coupler as I'm a long time 250 rider, a mellow 450 is plenty while I adjust.

Got the sag dialed in.

Forks running
187 inner
6 outer
220 balance.

Struggling in choppy braking bumps into corners. Any tips what to try from here? I went from 16psi in the outer down incrementally and it's better , much better, but still feel there's much more room for plushness into and thru corners.
Chaser503
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Pleasant Grove, UT US
4/16/2017 10:30am
For what it's worth, here's what was recommended to me by Factory Connection on stock fork valving ('15 kx450):

225 lbs, intermediate desert, novice MX

Sag: 5.9 kg spring, 105mm
Fork: 5 mm

Inner: 174, Outer: 10, Balance: 180
10 Comp 12 Rebound

Was pretty good, except at turn-in where the front end felt like it wanted to wash away. Sent to TBT and now has much more grip at turn in and through exit of turns. It just sticks.

Check the Showa app to model various settings.
Justin345
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Southern MD, MD US
4/16/2017 10:49am
yz133rider wrote:
We'll I'm here at budds creek waiting for my first moto and I brought the kawi. Slightly terrified!
I was in the same boat - racing at budds last weekend for the Masters series with my '15 kawi with a fresh revalve. I was the last moto of the day which ended around 7pm...track was so beat by then!
yz133rider
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Avondale, PA US
4/16/2017 12:59pm
yz133rider wrote:
We'll I'm here at budds creek waiting for my first moto and I brought the kawi. Slightly terrified!
Justin345 wrote:
I was in the same boat - racing at budds last weekend for the Masters series with my '15 kawi with a fresh revalve. I was...
I was in the same boat - racing at budds last weekend for the Masters series with my '15 kawi with a fresh revalve. I was the last moto of the day which ended around 7pm...track was so beat by then!
Lol Justin we were in the same moto then! The kawi was absolutely awful for me down those hills and thru the rough corners. Couldn't have been any worse I don't think lol
4/16/2017 1:57pm
the airforks are not bad but if you are really slow they always seems a bit hars. i have ohlins on my kxf450 15 but its acctully not that big diffrence. im 200pounds try 175 inner 185 balance on 0 outer, comp 8 out and reb 12 out. if they bottom put more oil in the left outer fork leg. or put more sag, im running 107 now.
JBecker 72
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Eastern Panhandle, WV US
4/16/2017 3:02pm
I just got done with a first ride on my 2016 KX450 and I'm actually pretty impressed with how they performed stock. I just went with MXA's settings for a Vet rider and it was great. They may be a bit complicated to get setup compared to a spring fork, but I was surprised with how well they worked.

I am the ideal weight for the stock bike though.
yz133rider
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Avondale, PA US
5/17/2017 1:40pm
I have tried everyone's suggestions in here, mxa's settings and my local tuners numbers, for my riding I'm still struggling with the forks. I've got about 10 hours of riding in now and have tried new settings nearly every day.

From what I can feel it's hard to get a wide window of where the forks work well. Get them soft enough to handle the small stuff they have nothing left for big hits like going a little long or short. Get them stiffer for that, now you suffer thru small bumps, cornering, and basically everywhere.

I just dropped them off to get spring conversion. Will report back on my review.

As far as the bike goes, I think I am gelling with it really well. I think it suits me very well and I am going to be faster on it than I ever was before IF I can get the Suspension to work for me.

The power is pretty awesome, brakes are great, riding position is awesome.


Build quality overall seems a touch below the Yamaha's I'm used to. The pegs although adjustable, are tiny, and poorly designed and trap mud compared to the Yamaha. And just many of the parts you can tell aren't machined as smoothly as the Yamaha. Also it has 10 hours on it and looks like I've ridden it for just about two seasons at times.

It looked absolutely amazing when new, but that wore off quick! All in all,if it is reliable and holds up none of that matters too much, just was pretty evident to me so far.

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