Preload setting - 2018 KTM 790 Duke Forum
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post #1 of 33 (permalink) Old 04-04-2019, 03:59 PM Thread Starter
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Preload setting

So my 790 arrived today finally so want to get the preload set. Iím a tad over 14 stone naked, anyone recommend a preload setting?
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post #2 of 33 (permalink) Old 04-04-2019, 05:11 PM
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Congratulations!

Not touched mine at 14lb heavier, don't even know what it's on. Just enjoy it.
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post #3 of 33 (permalink) Old 04-04-2019, 05:51 PM
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Quote:
Originally Posted by weeksy View Post
Congratulations!

Not touched mine at 14lb heavier, don't even know what it's on. Just enjoy it.
Ditto. I'm 72 kg in my socks and it's maybe a touch firm on standard settings but not enough for me to do anything about it yet. Besides, you need to get a couple of thousand km on it to settle everything in before you start taking measurements. I've always used 15-20 mm static sag and 30-40mm loaded sag on my road bikes as a starting point for rear suspension. I'll measure it at some point but as weeksy says - just get out and enjoy it!
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post #4 of 33 (permalink) Old 04-07-2019, 05:49 PM Thread Starter
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You both both right, was mint
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post #5 of 33 (permalink) Old 04-10-2019, 03:20 AM
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Bomble at 14 stone you may need a little more preload. Heres my measured sag and free sag. Prob be ok for me left at stock, I'm 77kgs.
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post #6 of 33 (permalink) Old 04-10-2019, 05:45 PM Thread Starter
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What are the suggested sag settings from Ktm?
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post #7 of 33 (permalink) Old 04-10-2019, 06:43 PM
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What are the suggested sag settings from Ktm?
I don't know what KTM suggest, but the spring rates on the 790 are quite soft, probably sprung for a rider around 70kg. if you aim for around 40-45mm rider sag and 15-20mm rear free sag you should be in the ball park for what comes on your bike. The 790 is a soft set up for anyone over 75kg.
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post #8 of 33 (permalink) Old 04-11-2019, 05:00 AM
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I'm 65kg in my birthday suit and find the factory setting good and haven't played with it yet.Don't think I would want it softer though.
It was funny getting on the KLE for a spin today. Felt like sitting on a marshmallow.
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post #9 of 33 (permalink) Old 04-11-2019, 03:01 PM Thread Starter
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Originally Posted by DaveNZ View Post
I don't know what KTM suggest, but the spring rates on the 790 are quite soft, probably sprung for a rider around 70kg. if you aim for around 40-45mm rider sag and 15-20mm rear free sag you should be in the ball park for what comes on your bike. The 790 is a soft set up for anyone over 75kg.
Will dig out my motool slacker and have a play when I get time
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post #10 of 33 (permalink) Old 04-13-2019, 09:59 PM
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Just for reference purposes, here are some measurements I took today. Will retake them when I've clicked over 2000 km as things should have fully settled in by then. To get the full extension reference measurements, I had both wheels off the ground with my ABBA Superbike stand.

My weight with day clothes is approx 74kg. Didn't put on my riding gear for this test, but did have my tail pack on it containing a few tools, mini compressor and puncture repair stuff)

FORKS: Full extension (between machined area on hub/brake casting and bottom of fork seal is 160 mm.
Unloaded measurement 120mm. Unloaded sag 160-120 = 40mm. (Generally recommended range 20-25mm). Makes me wonder whether the Duke has progressive fork springs as the loaded sag was ok - just).
Loaded sag = 160-110 = 50mm (Generally recommended range 35-50mm).

I've also fitted a cable tie to one of the fork legs to check the dynamic dive. I'm not heavy on brakes for road use and so far, the cable tie gets pushed to 42mm above the machined area on the hub/brake casting which seems reasonable. I'll do some more work on this in due course to find out where it binds under full compression.

REAR SHOCK: Full extension (between top of swingarm and underside of grab handle - see photo) is 540mm.
Unloaded measurement 520mm. Unloaded sag 540-520 = 20mm. (Generally recommended range 15-20mm)
Loaded measurement 480mm. Loaded sag 540-480 = 60mm. (Generally recommended range 30-40mm). This suggests I could do with another click of preload.

I won't be touching anything until I've done a re-measure in the next week or two. It doesn't feel too bad at present. I was fortunate to attend a suspension course with international expert Dave Moss last year which was quite an eye-opener. As well as setting the bikes up statically, he also tweaked them over the course of a ride when the suspension oil got hot. I had the GSX-S 1000 at the time which had all-round compression and rebound damping too. There's a bit of detail and some photos in the last half of this blog post: https://geoffjames.blogspot.com/2018...lent-week.html. Dave also does some excellent YouTube videos.
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Last edited by Geoff; 04-13-2019 at 10:01 PM.
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