Front fork travel. - Suzuki GSXS1000 Forum
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post #1 of 14 Old 06-18-2018, 12:12 PM Thread Starter
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Front fork travel.

According to the Workshop Manual fork stroke is 120mm.

With the front wheel off the ground the distance from the lip of the dust seal -where it contacts the tube - to the casting at the bottom is 116mm.

So it looks like on full compression the seal will be squashed by 4mm.

Am I right or am I missing something?

I have a cable tie on the tube and it has been pushed to the bottom on occasion.

Blue Naked 2015 ABS model. PCV, Nitron Ntr-1 shock, MRA screen(modified) Puig crash bungs, HEL lines and EBC-HH pads, job done. (Riding since 1959.)
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post #2 of 14 Old 06-18-2018, 02:05 PM
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I wonder if the maximum mechanical stroke is 120mm but the oil in the forks (more in the F) prevents the stroke ever achieving close to 120mm.

I haven't been within 10mm of the bottom
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post #3 of 14 Old 06-18-2018, 02:16 PM
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Ahem!
Should I be asking how much you Gentlemen weigh? and could it be the difference between you which makes it bottom out for one and not the other or shall I just blame it on the good old British pot holes
As for the missing 4mm. I haven't a clue but it seems size does matter to some of us
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post #4 of 14 Old 06-18-2018, 02:26 PM
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Ahem!
Should I be asking how much you Gentlemen weigh? and could it be the difference between you which makes it bottom out for one and not the other or shall I just blame it on the good old British pot holes
As for the missing 4mm. I haven't a clue but it seems size does matter to some of us
Only 107Kg (16stone 12 lbs) in riding gear and pot holes aren't so bad here
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post #5 of 14 Old 06-18-2018, 03:05 PM
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16stone 12 lbs
...I definitely blame the British for how ****** up US measurement systems are.
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post #6 of 14 Old 06-18-2018, 03:22 PM
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...I definitely blame the British for how ****** up US measurement systems are.
At least we moved on and changed almost all of them to SI, why can't you go guys catch up?
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post #7 of 14 Old 06-18-2018, 03:31 PM
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When my suspension was set up by Dave Moss, he marked maximum stroke before starting to adjust it. The mark is 5mm above the top of the bottom casting.
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post #8 of 14 Old 06-18-2018, 05:19 PM Thread Starter
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Originally Posted by Kiwi Geoff View Post
When my suspension was set up by Dave Moss, he marked maximum stroke before starting to adjust it. The mark is 5mm above the top of the bottom casting.
Thanks Geoff, how did he find/know what max stroke was, and did he measure from the seal edge like I did ?

It's Dave Moss who's to blame for my post, been watching his YouTube channel. Unless it's a different man as he's in the USA
If he is right then max stroke must be less than 120mm.
My riding weight is 168lbs (12 stone) but I'm on a diet so it's coming down.

Blue Naked 2015 ABS model. PCV, Nitron Ntr-1 shock, MRA screen(modified) Puig crash bungs, HEL lines and EBC-HH pads, job done. (Riding since 1959.)

Last edited by dekker; 06-18-2018 at 05:22 PM.
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post #9 of 14 Old 06-18-2018, 06:00 PM
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Originally Posted by dekker View Post
Thanks Geoff, how did he find/know what max stroke was, and did he measure from the seal edge like I did ?

It's Dave Moss who's to blame for my post, been watching his YouTube channel. Unless it's a different man as he's in the USA
If he is right then max stroke must be less than 120mm.
My riding weight is 168lbs (12 stone) but I'm on a diet so it's coming down.
Hi Dekker,

I can't precisely tell you how he did it as it was the precursor to a tuning ride with some other riders on the course and I was chatting whilst they were taking some of the initial measurements (see: write-up and photos towards the bottom of this blog post: Confessions of an Ageing Motorcyclist: A most excellent week!). To get the full extension, another guy and I angled the bike on the side stand whilst Dave measured it. He then put on a zip tie and he and the course coordinator put their combined weight through the bars. The 5mm measurement I mentioned must have been to the seal lip as that's what would have pushed the zip tie down. During the ride at various stop points, Dave would do some re-measurements when the oil was up to working temperature and make various adjustments. Not sure how much help that's going to be to you! I might add that I periodically reset the zip tie and it rarely gets any closer to the bottom casting than 20-25 mm measured at the top of the tie where it contacts the seal lip.

As an aside, the course coordinator was a guy called Chris Smith who is an IAM member with me. Chris is English and when he lived in the UK, he taught Angeline Jolie, Matt Damon and other celebs to ride for their movies! Some nice photos on his website here: https://www.passmasters.nz/gallery

Edit: BTW, my weight in my socks is 74 kg
Cheers,

Geoff
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post #10 of 14 Old 06-18-2018, 10:55 PM
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Originally Posted by dekker View Post
According to the Workshop Manual fork stroke is 120mm.

With the front wheel off the ground the distance from the lip of the dust seal -where it contacts the tube - to the casting at the bottom is 116mm.

So it looks like on full compression the seal will be squashed by 4mm.

Am I right or am I missing something?

I have a cable tie on the tube and it has been pushed to the bottom on occasion.
Aside from the discussion about stroke length..how much preload are you running because if you have bottomed out it sounds like you don't have enough preload
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