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Offline Zevk

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Hyperpro suspension fork springs replaced
« on: 05 June, 2020, 09:57:20 AM »
Hi all

Just replaced front OEM Fork springs with Hyperpro
Progressive springs

went for a 20 min test ride

The front feels a bit lighter than before and easier to steer.. I think

the rate of suspension is certainly progressive in its action, meaning,  as i apply front brake, the first section of compression is soft but it quickly stiffens up, as the forks compress further

It is different than the oem...

I have all the Fork settings exactly as Per hyperpro specifications, but I will now need to fine tune it in to my liking

Note the spec label calls for
15w not 10w

And 130 mm from top of fork to oil level

I suspect I will need to increase a bit of everything ie
spring pre load, rebound And compression but Ill do that a little bit at a time, after i check the static sag of 40 mm

Overall Im happy I did this, just for the fact that the oil was grey, foul and I cant believe how thin It was, almost like water!

I replaced my fork oil 2 years ago with Castrol 10w, it was thick honey color When new.
Now motorex 15w

just demonstrates how oils break up and dont last a long time.

The manual calls for a 4 yr (!) fork oil replacement, but i will do this every yr from now on

I also re sprayed my front wheel with plasti-dip And cleaned the brake pads and caliper pistons

..a 4.5 hr job

See photos

The Hyperpro progressive spring is the one with tight coils at one end...










« Last Edit: 05 June, 2020, 10:18:29 AM by Zevk »

Offline Timbox

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Re: Hyperpro suspension fork springs replaced
« Reply #1 on: 05 June, 2020, 01:54:08 PM »
You may find in cold weather (If you ride in that), that the forks are quite "wooden" until they warm up with 15cwt.
Ex Sport owner now on KTM 1290 SAS

Offline Zevk

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Re: Hyperpro suspension fork springs replaced
« Reply #2 on: 05 June, 2020, 10:41:48 PM »
Thanks for that, Ill keep that in mind!

Im also quite wooden in cold weather, so my riding will match the bikes suspension, haha

Online Tigermike

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Re: Hyperpro suspension fork springs replaced
« Reply #3 on: 06 June, 2020, 05:58:43 PM »
Are you getting a smoother ride when riding over rough roads with the new springs Zevk?
Yam RD125 DX, Kwak GPZ305, Honda CB400T, 1983 Kwak GT550, Suzuki GSF650 Bandit, Tiger 1050SE .... got there in the end.

Offline Zevk

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Re: Hyperpro suspension fork springs replaced
« Reply #4 on: 06 June, 2020, 10:47:29 PM »
I believe I am, but I only had a 30 min test ride on tight fast country roads, it has been cold and wet here in Melbourne, hope to test ride next week...


Offline sax_000

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Re: Hyperpro suspension fork springs replaced
« Reply #5 on: 07 June, 2020, 12:01:32 AM »
G'day all,

I've just had my forks modded by Shock Treatment.  They altered the damping, including Gold Valves, and installed Race Tech 0.95 kg/mm straight-wound springs.

In an earlier post I queried the difference in fork springs between early T1050s (eg. '07) and later T1050s (eg. '12) and Terry Hays (Shock Treatment) said that while both springs were rated at 0.6 kg/mm,
the early springs were progressive-wound with a MAXIMUM of 0.6 while the later springs are straight-wound with a consistent rate of 0.6.  That explains why the forks in my '07 felt so mushy while the '12 seemed much firmer.

So far I've only been able to do a couple of short local rides (hopefully a longer ride next week on some "suspension testing" roads) but the springs feel good.  Because the front-end of the bike is sitting much higher than before, I noticed that I had lost some steering precision.  So I raised the fork legs in the clamps by a further 10mm (they were already raised by 10mm) and, so far, that seems OK.

We'll see.

Saxo

Offline Zevk

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Re: Hyperpro suspension fork springs replaced
« Reply #6 on: 07 June, 2020, 12:12:32 AM »
Hi Saxo thats sounds fantastic extensive suspension modification

May I ask how much that procedure cost?

Offline Zevk

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Re: Hyperpro suspension fork springs replaced
« Reply #7 on: 13 June, 2020, 01:04:59 AM »
Had a 1 hr test ride On country, highway and city roads with new:

Hyperpro fork springs and motorex 15w Oil, set at Hyperpro  Fluid specs Of 130 mm air gap.

preload set at 1 ring exposed

Compression and rebound 0.75 from Bottom out

The result is a much more comfortable ride Which feels lighter on turning and absorbs the road much better

Offline sax_000

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Re: Hyperpro suspension fork springs replaced
« Reply #8 on: 13 June, 2020, 06:53:10 AM »
Hi Zevk,

It was about AU$750 all-up.

I went for a ride last Thursday on some roads that have always been good suspension-testing roads.  The bastards have fixed/are fixing all of them!  There was even a dirt road that always had potholes and ripple-strips, now smooth as a baby's bum!  However I did manage to find an unreconstructed dirt road and the new suspension soaked it all up at a good fast speed.  The suspension is certainly much firmer than before but that's the way I like it, lots of control and no mushiness or brake-dive.  BTW, I've got a high-spec Wilbers shock on the rear.

Seeya

Saxo

Offline Zevk

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Re: Hyperpro suspension fork springs replaced
« Reply #9 on: 13 June, 2020, 10:11:37 AM »
Hi saxo

Thats great to hear it made an improvement And a very fair price considering all the work and parts required!