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dropping forks through yokes & hagon springs

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jerryfudd
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dropping forks through yokes & hagon springs

Post by jerryfudd on Sun 04 Jan 2015, 11:57 am

Hi,

I read on the racing forum that some have done this to around the 10mm mark - has anyone done it for road use? is there much advantage?

Dan


Last edited by jerryfudd on Sun 04 Jan 2015, 5:17 pm; edited 1 time in total
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eternally_troubled
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Re: dropping forks through yokes & hagon springs

Post by eternally_troubled on Sun 04 Jan 2015, 1:24 pm

Just to clarify: Do you mean sliding the head down the forks my 10mm (ie. forks 10mm shorter)?

As far as I understand these things that should make the steering quicker. I haven't tried it.
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jerryfudd
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Re: dropping forks through yokes & hagon springs

Post by jerryfudd on Sun 04 Jan 2015, 2:05 pm

yes thats right - just wondered if anyone on here had tried it
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jchesshyre
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Re: dropping forks through yokes & hagon springs

Post by jchesshyre on Sun 04 Jan 2015, 5:02 pm

I've done it by (IIRC) 15mm (or possibly 20 – I'll check!) which seems to complement the stiffer Hagon progressive springs I have very nicely. It doesn't feel twitchy or unstable at high speed at all and drops into corners beautifully.

I also have Hagon shocks, on their middle setting (I weigh c. 11 stone), and I use BT45s at 36psi F 40.5 psi R.


Last edited by jchesshyre on Sun 04 Jan 2015, 5:11 pm; edited 1 time in total
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jerryfudd
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Re: dropping forks through yokes & hagon springs

Post by jerryfudd on Sun 04 Jan 2015, 5:07 pm

thanks, would be interested to know what you dropped it by exactly however atleast for the moment I'll be running standard springs on the front - might replace with hagons at some point but would rather upgrade the rears first.
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jerryfudd
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Re: dropping forks through yokes & hagon springs

Post by jerryfudd on Sun 04 Jan 2015, 5:16 pm

....while on the subject is it worth holding off rebuilding the forks till I get some hagon progressive springs? are they really that much different? as the springs already seem to have a progressive coil to them (2002 bike)
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jchesshyre
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Re: dropping forks through yokes & hagon springs

Post by jchesshyre on Sun 04 Jan 2015, 5:29 pm

I found the difference to be night and day when I changed mine, and the existing springs only had about 13,000 miles on them. I use 10W fork oil (slightly heavier than Hagon's recommended 7.5W). I'd tentatively suggest you replace the fork springs before the shocks, unless the latter are utterly f*cked.

I reckon the stock springs are geared a bit more towards comfort than precise handling, and the steering geometry is obviously set to go with this. There's no doubt that the ride's harder with the Hagon equipment, but it doesn't bother me at all – it's not uncomfortable and if I'd wanted a Gold Wing I'd have got one!
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jerryfudd
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Re: dropping forks through yokes & hagon springs

Post by jerryfudd on Mon 05 Jan 2015, 11:10 am

damn you making me spend more money! Laughing

(just ordered hagon springs)
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Re: dropping forks through yokes & hagon springs

Post by geewhizz on Mon 05 Jan 2015, 9:49 pm

Keen to hear how you get on with the new springs. I was tempted to do it earlier but went with 20w oil, 120mm airgap with the original springs (copied from the guys over on the race forum) lowered the forks 10mm. It a great improvement. Firm ride and turns in really fast. Tried 15w oil first and 5mm drop but it wasn't firm enough.
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jchesshyre
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Re: dropping forks through yokes & hagon springs

Post by jchesshyre on Mon 05 Jan 2015, 10:08 pm

Checked today and my yokes are dropped by 10mm. 

Glad you're getting the springs too!

NB the air gap and recommended oil weight for the Hagons is different from stock: 140mm and 7.5W are what they specify. Also the spacers aren't used. Also they go the opposite way up from the stock ones: closer wound coils at the top. Enjoy! It'll feel like it's stuck to the road.
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Re: dropping forks through yokes & hagon springs

Post by jerryfudd on Mon 05 Jan 2015, 10:10 pm

great, thanks! if it doesn't use the spacer does it still need the washer?
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jchesshyre
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Re: dropping forks through yokes & hagon springs

Post by jchesshyre on Mon 05 Jan 2015, 10:10 pm

Yes!
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Re: dropping forks through yokes & hagon springs

Post by jerryfudd on Mon 05 Jan 2015, 10:11 pm

brilliant and everything else is normal even the rebound spring?
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jchesshyre
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Re: dropping forks through yokes & hagon springs

Post by jchesshyre on Mon 05 Jan 2015, 10:13 pm

Yes, no other changes. I'm sure you know this but the air gap is measured with the springs out and the forks fully compressed.
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Re: dropping forks through yokes & hagon springs

Post by flashs on Mon 05 Jan 2015, 11:10 pm

http://sharon2shoes.wix.com/townievtheworld

Hi, the site above explains better in the bike build section....

 up front, to cope with the extra weight for my trip...  Hagon supplied me with progressive springs.... but the ones for the BMW K100rs  which fit..  and are even stiffer than the hagon prog cb ones...

  Also.... they built the rear shocks with 20kg stronger springs, and when loaded, the bike handles very well..
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jerryfudd
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Re: dropping forks through yokes & hagon springs

Post by jerryfudd on Mon 05 Jan 2015, 11:19 pm

thanks, I'm reasonably confident but it's my first go and don't want to sod it up Wink
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jchesshyre
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Re: dropping forks through yokes & hagon springs

Post by jchesshyre on Mon 05 Jan 2015, 11:42 pm

Do you have a Haynes manual? If not there's a scan of it somewhere on the site, I think... If not I'll PM it to you. It has some good tips for doing the forks.
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Re: dropping forks through yokes & hagon springs

Post by jerryfudd on Mon 05 Jan 2015, 11:46 pm

I used the Haynes to dismantle them to I could get the lowers coated - as you say it's pretty good. I also have all of the workshop manuals aswell as a whole heap of photos I took during the disassembly so I was pretty confident about the re-assembly but swapping out the springs has introduced an unknown element into the mix so trying to get all my dumb questions out the way now lol
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Re: dropping forks through yokes & hagon springs

Post by jerryfudd on Tue 06 Jan 2015, 12:16 am

ok, one more - so without the spacer the washer now sits directly below the top cap right?
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jchesshyre
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Re: dropping forks through yokes & hagon springs

Post by jchesshyre on Wed 07 Jan 2015, 11:14 am

Yes that's right. So that turning the top cap under pressure doesn't damage the spring, or vice versa.

It says this in the manual but be very careful not to cross-thread the top caps, and also make sure the threads are completely clean. I found them an arse to get back on as you have to push down fairly hard whilst not cross-threading them. Two tips for this: 1. remove the handlebars. 2. turn anti-clockwise until you feel/hear a click, then start tightening. The upward pressure of the spring makes it a little tricky to keep the cap lined up but you'll get there!
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Re: dropping forks through yokes & hagon springs

Post by jerryfudd on Wed 07 Jan 2015, 11:30 am

thanks, the Hagon springs arrived yesterday so as soon as my new stanchions arrive (from Belgium) which should hopefully be today I can crack on.

They aren't on the bike on the moment but ALWAYS follow step 2 no matter what bolt or where it is..... just good practice at the end of the day.
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jerryfudd
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Re: dropping forks through yokes & hagon springs

Post by jerryfudd on Wed 07 Jan 2015, 10:54 pm

Well, here they are!


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Re: dropping forks through yokes & hagon springs

Post by sullivj on Thu 08 Jan 2015, 6:19 am

All rebuilt and looking mighty fine. Well done mate.
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jchesshyre
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Re: dropping forks through yokes & hagon springs

Post by jchesshyre on Sat 10 Jan 2015, 4:10 pm

Nice one!

Just double checked and actually my yokes are dropped by 15mm not 10. I tried 10 to begin with, then 20, and 15 seemed perfect. Just experiment! And make sure it's EXACTLY the same on each fork.
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Re: dropping forks through yokes & hagon springs

Post by jerryfudd on Sun 11 Jan 2015, 12:17 am

did you find it just made the steering sharper? fitted the forks today with a 10mm adjustment so when I finally get it ridable I might be able to tell for myself Smile

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