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Yeti365 Yeti365
9/14/2018 10:34 AM

Got a '16 Yz450f, race intermediate. 240lbs. with gear. Running a .51 spring in the forks, 6.1 on the shock. I've got the bike pretty dialed in, doesn't really do anything bad except bottom out control.

I'm pretty sold on the JBI perch, has anyone stacked this with the Huck valve? Debating throwing this in the forks.

Just need a way to keep the forks from harsh bottom out on hard hits and flat landings while still staying up in the stroke and taking up all the small, choppy crap.

A wise man once said nothing

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m21racing m21racing
9/14/2018 12:41 PM

Your springs seem soft for your weight and skill

Livin' the dream, two wheels at a time!

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Yeti365 Yeti365
9/14/2018 1:48 PM
m21racing wrote:

Your springs seem soft for ...more

I thought that but the fork isn't nose diving and tracks the front end quite well.

What do ya recommend trying? I don't mind playing with spring rates. I'm for sure doing the Pro Perch, the Huck valve was the question mark since I have a gold valve on both ends currently done by Precision Concepts and have been happy with it other than when I really charge into something or flat land.

A wise man once said nothing

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m21racing m21racing
9/14/2018 2:55 PM

I like a .54 and 6.3 and valved properly. Dsp has .54, so does cannon i believe, maybe race tech.Max rate from kyb is .51. What sag, and how much preload is on shock spring to get what sag you have?

I had a fast 175lb pro on 5.7/.49 and it worked well. He was 6ft tall, so i left him on stock rates.

Livin' the dream, two wheels at a time!

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Yeti365 Yeti365
9/14/2018 3:42 PM
m21racing wrote:

I like a .54 and 6.3 and ...more

Race Tech has a .54 and .56, I'm just debating a new shock spring to balance it out. I'd rather have a heavier spring with mellow valving than a soft spring with stiffer valving.

Sag I usually put around 105mm, at LACR/Milestone/Comp. 100-103 At Glen Helen.

So, I'm thinking based off Everyone's advice maybe try a .54 and 6.0 from Race Tech with the Pro Perch and go from there? Like I said, I'm pretty happy with how the valving feels except for harsh fast shit.

You mentioned max from KYB is .51, I assume that means don't put in anything stiffer than that? I've never heard that before so now you have me slightly concerned lol

And I found my receipt. Fork springs are a .50, not .51. Race Tech doesn't list a .51 for my bike, so my bad.

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m21racing m21racing
9/14/2018 3:47 PM

Stock was 5.7, a 6.0 is 1 1/2 rates from that. 240lb i would put you at 3 rates above stock.

Livin' the dream, two wheels at a time!

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Yeti365 Yeti365
9/14/2018 4:13 PM
m21racing wrote:

Stock was 5.7, a 6.0 is 1 ...more

Thanks, dude. I'll start with the new springs and see how that goes. It seems like that's the main focus and fix. So .54/.56 and 6.3.

A wise man once said nothing

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m21racing m21racing
9/14/2018 4:17 PM
m21racing wrote:

Stock was 5.7, a 6.0 is 1 ...more

Yeti365 wrote:

Thanks, dude. I'll start ...more

Ya man, the springs and oil control most of bottoming. Jbi perches are nice, and people like huck valves too, but proper springs is first step.

Livin' the dream, two wheels at a time!

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Yeti365 Yeti365
9/14/2018 4:24 PM
m21racing wrote:

Stock was 5.7, a 6.0 is 1 ...more

Yeti365 wrote:

Thanks, dude. I'll start ...more

m21racing wrote:

Ya man, the springs and ...more

Totally agree. Just every bike I've ridden with soft springs has had super harsh feedback, especially coming into corners.

I guess I got so used to the bike and had the front and rear balanced that I didn't notice as much.

But on the KYB forks, .54-.56 will be fine right? Like it won't damage the fork?

A wise man once said nothing

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m21racing m21racing
9/14/2018 4:48 PM
Yeti365 wrote:

Thanks, dude. I'll start ...more

m21racing wrote:

Ya man, the springs and ...more

Yeti365 wrote:

Totally agree. Just every ...more

Nope. Ive run shorter .54s with spacers and all was good. Stock was .49, so three rates up .53/.54

Livin' the dream, two wheels at a time!

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mrg172 mrg172
9/14/2018 6:40 PM

JB of JBI is actually relocating to Murietta from AZ this week. He is a good guy and he would be able to help you figure out what will work best with the pro perch. I have run his setups in the past and they were great. Check out his facebook site, just search Ride JBI. Sucks he moved from AZ but still fairly close

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captmoto captmoto
9/14/2018 8:55 PM
mrg172 wrote:

JB of JBI is actually ...more

I hope he dug deep about operating a business in California. It's not as easy as anywhere else.

The older I get, the faster I was.

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Flipsid33 Flipsid33
9/21/2018 10:54 AM

If you decide to go with huck valves(which you may not be able to find) you'll need shorter springs. So if you re-spring then decide to add them later plan on buying 2 sets of springs.

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Johnny89superbike Johnny89superbike
9/21/2018 6:00 PM

Is increasing the oil level / quantity an option, have you tried it?

Melbourne, Australia. Current rides: '11 RMZ450, '84 CR500, '06 DRZ400, '79 KX250 with 400 engine, '06 GSXR1000 full Yosh racebike.

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Yeti365 Yeti365
9/25/2018 8:09 PM
Johnny89superbike wrote:

Is increasing the oil ...more

I've gone back and forth on oil height. It either made things harsher or no effect. I didn't switch to Race Tech fluid when I got the Gold Valves and haven't looked back.

I ordered a 6.0 spring for the rear and .54 for the front.

Work is going to be psychotically busy for me until December so won't have the opportunity to hop on until then. I doubt I'll be going with the Huck valve, I think I'll stick with the pro perch unless I don't get along with it. Just wanted some insight in case people have tried both.

A wise man once said nothing

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Sheriff245 Sheriff245
9/27/2018 8:40 AM

Definitely try the harder springs. As for spring perches, I suggest you try the KYB kit perches which are much cheaper than the JBI. They are available through Technical Touch. I had them in my 16 YZ450F and they made a huge difference in bottoming control.

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Yeti365 Yeti365
9/27/2018 9:34 AM
Sheriff245 wrote:

Definitely try the harder ...more

If I don't get along with the JBI perch then I'll probably be looking into that. Already got the Pro Perch ordered.

Thanks

A wise man once said nothing

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Premix Premix
9/27/2018 9:57 AM

.51 Fork spring is fine. You need a stiffer shock spring for sure. 6.6 or 6.7. Never used the JBI, always just drilled the stock ones. It’s all valving/oil height from there. Replacing pistons is a waste of money.

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