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+--- Thread: Front fork springs. (/showthread.php?tid=79826)
Re: Front fork springs. - Mustang - 28-07-18
What’s the result then?I want to do mine n all
Re: Front fork springs. - kebab19 - 29-07-18
Just under 13 stone in kit, 0.85kg springs, 10w oil, oil height 140mm.Preload minimum, compression 12 clicks out from max, rebound 5 out from max (started with standard 7 and 4 respectively).
In a word, disappointing. Longer version - from a handling perspective, far better at holding lines, but remains harsh, kicking up over bumps. Perhaps I've been spoilt by suspension setups from other bikes, but to me, over bumpy back roads (where I spend a lot of my time) the bump compliance is still nowhere near good enough. I bought this bike with the possibility of touring in mind, but that's not an option until it can go over uneven roads without delivering impact shocks to me through the bars.
As a final fork mod, I'm cutting the internal preload spacer down by 10mm and reducing oil height to 150mm to see if it becomes marginally softer.
After that, I'm not sure re options. Unlikely to go down the R1 fork route again. Might fit R6 5SL forks again or get someone like Maxton to modify the internal valving.
Re: Front fork springs. - PieEater - 29-07-18
If your primary aim is to achieve a more plush ride for touring / comfort then progressive springs would be a better choice. By their nature linear springs are harsher compared to progressive / dual-rate but offer more predictable handling allowing you to carry more speed through corners etc. but they shouldn't be overly harsh as to make the bike unpleasant to ride. Have you tried reducing compression damping as this should soften the action of the forks?
Re: Front fork springs. - kebab19 - 29-07-18
I've previously replaced standard dual rate springs with linears for my old TRX850, Bandit 1200 and FZS600 bikes: all were comfortable enough afterwards.
With only 11k up on the clock the forks shouldn't be worn out yet - nonetheless, I am begining to suspect that my fork leg stanchions might even be slightly warped / out-of-true, restricting / slowing down the fluidity of inner stanchion movement.
Compression damping was reduced from 7 to 18 clicks out, didn't seem to make any noticeable difference. Although I've yet to test my final modifications, it probably won't make that much of a difference. So I'm now thinking whether I should throw another £500+ for the suspension pros to sort out the damping, spend roughly the same amount buying & fitting Andreani or Race Tech fork internals or just switch over to other forks.... rapidly turning into a bottomless money pit :\
Re: Front fork springs. - Mustang - 29-07-18
Blimey, I’m on std fork spring with 10w oil. Just as you say it kick off bumps all the time, I read on here somewhere the forks have too much comp so I’ve would it all off, it’s better but not as good as other bikes I’ve had. I’ll try some progressive springs.
Re: Front fork springs. - 5LV - 29-07-18
My $0.02.
From memory 10w oil is too thick.
I ran 9.5 springs with 2.5/5w mix. Rebound was on max and compression was backed right off to 3 or 4 clicks.
Everybody who rode it always said it was compliant.
The standard forks upgraded are reasonably useful bits of kit, but take a bit of time to set up.
Re: Front fork springs. - happycallis - 29-07-18
Can you remember what your ore load was set to. I'm running the same springs with 5w oil.
(29-07-18, 06:41 PM)5LV link Wrote: My $0.02.
From memory 10w oil is too thick.
I ran 9.5 springs with 2.5/5w mix. Rebound was on max and compression was backed right off to 3 or 4 clicks.
Everybody who rode it always said it was compliant.
The standard forks upgraded are reasonably useful bits of kit, but take a bit of time to set up.
Re: Front fork springs. - kebab19 - 29-07-18
Lol I'm not long after taking 2.5w oil out, I should maybe stick it back in again :lol
Re: Front fork springs. - 5LV - 29-07-18
(29-07-18, 07:45 PM)happycallis link Wrote: Can you remember what your ore load was set to. I'm running the same springs with 5w oil.[/quote]
[quote author=5LV link=topic=24302.msg282494#msg282494 date=1532886095]
My $0.02.
From memory 10w oil is too thick.
I ran 9.5 springs with 2.5/5w mix. Rebound was on max and compression was backed right off to 3 or 4 clicks.
Everybody who rode it always said it was compliant.
The standard forks upgraded are reasonably useful bits of kit, but take a bit of time to set up.
I take it you mean pre load.
Preload only sets the ride height (sag) on your forks so is subjective to each rider.
However I had my forks dropped 15mm and 25mm of sag. Really getting on the brakes (stoppie) would leave @ 20mm of fork travel left. Hth
Re: Front fork springs. - happycallis - 30-07-18
Cheers 5LV for that. It just gives me something to aim at now and see how it goes for me.
Re: Front fork springs. - happycallis - 31-07-18
Think I have fucked up somewhere down the line .I have wound out the pre load adjuster as far as it will go and I get about 3mm of sag. When I had the forks apart could I have done something to it?
Re: Front fork springs. - kebab19 - 01-08-18
I didn't get much sag outta my revised setup when I first fitted them - there could be fork 'stiction'.
These revised springs you added - are they the same length as the original springs or different?
The only thing I can think of is that your replacement fork springs are not exact same length as the original springs - if they are longer than standard and you haven't revised the length of the hollow metal spacer to take the difference into account they would be very firm as a result, offering little sag.
Re: Front fork springs. - 5LV - 01-08-18
Did you bleed the damping rod when you 're assembled the forks?
As has been mentioned, measure the spring lengths as k tech do have a reputation for getting things wrong.
Once you have checked the obvious get back to us?
Re: Front fork springs. - happycallis - 01-08-18
To be honest I didn't check the springs against each other.
I did bleed the system before putting them back together .
The metal spacer you are referring to, is that the one that sits at the bottom of the fork leg? If so would I need to shorten it by the difference in the springs length?
Re: Front fork springs. - 5LV - 01-08-18
Don't start cutting spacers.
Phone k tech and tell them that they've sent you the wrong items. ( if they have)
The spring rates are engraved on one end, check that too!
Mine came with different numbers of coils in each spring!
Re: Front fork springs. - happycallis - 02-08-18
I will have a look as one of my forkseals has decided to die on me so will have to take one of the forks back apart.
Re: Front fork springs. - Ricky - 02-08-18
I went down the progressive spring route simply because of the state of the crap roads , the handling may be a bit compromised but for me it was the way to go.Having also gone down the R6 rear shock route and talking at length to both Luke and Mike, the front is greatly defected by the rear shock, so may be you should look at that also.Luke gave me some settings for my R6 shock but they did not work with my progressive springs and spent some time finding the best compromise , for that is what it is in the end. It was Mike who finely sorted it out in the end with just a few tweaks to the front and rear, now it sorted. With the bad state of are roads I don't believe you can get a perfect setup just a compromise.
Re: Front fork springs. - happycallis - 02-08-18
I have just finished fitting the R6 rear shock conversion and had the bike booked in to have the suspension set up properly for me (they have done both my race bikes before) I know there is a from fork internals kit available for it but will see what it's like once setup
Re: Front fork springs. - Triggergee - 02-08-18
Ricky do you know what the settings were in the end after Mike sorted it? Also where do you all take your bikes to have the suspension set up and what sort of price is it?
Re: Front fork springs. - happycallis - 02-08-18
I'm going to MD-racing over in Middlesex as it's nice and local to me.