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July 8th, 2010, 01:45 AM   #1
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09/450 fe rear shock

ive just gone up on the springs on my fe 450 front 4.6kgs and the rear to a 72kgs my weight is 83kgs with out gear.
the front feels great but the rear feels like it's blowing through way to quickly so i increased the high speed compression which helped slightly, so i contacted my nearest dealer and had a chat about a revalve and he said the way forward was to change the high speed shims to the same as the fx models for a superior ride, but i trust the opinions of people on this site above all else
many thanks for your forthcoming answers
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July 8th, 2010, 05:01 AM   #2
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Re: 09/450 fe rear shock

HI Johnny,

The first problem as I see it, is that you based your spring rates without being in full riding gear. You say you are 83 kg's without gear, don't know if that is in street clothes or your birthday suit. Weigh yourself in full kit, ready to ride and see how much you weigh.

Typically you add about 9 Kg's for your gear, so that would put you at 92 kg's in gear, which is what you are riding at.

So, you are not only out out of balance as the .46N/mm fork springs are good for 85-95Kg's, but should be mated to the 76N/mm shock spring, which is also rated for 85-95kgs. So it's no surprise that you are blowing through the travel, as the 72N/mm spring is rated for 75-85kg's.

However, you put in .46kg fork springs which are equal to .45N/mm, which means you are bit light on the fork springs, if you are going to be putting in fork springs rated in Kg's instead of N/mm you need to compensate for the difference, so you need .47kg fork springs mated to a 76N/mm or 7.75kg shock spring, never heard of a 7.75 kg shock spring so you would need an 7.8 kg spring for the rear if they make that, or an 8kg which is more common.

I'm betting that with your current spring, and with the static sag set correctly, you will find that you are out of range on the rider sag. Try going up to the heavier rear spring, and see how it feels.

I agree that the bike needs to be re valved, but, without the proper springs, if you compensate for this with a valving change only you are going to end up with a harsh ride.
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July 8th, 2010, 07:04 AM   #3
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Re: 09/450 fe rear shock

daleo thank your for your reply my mistake is my spring is 76kgs please could you offer further advice many thanks

ps i also think the forks and rear spring settings are N/mm
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July 8th, 2010, 11:02 AM   #4
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Re: 09/450 fe rear shock

Other advice...........

No matter what, do not deviate fromt the 30-35mm of static sag. The book says 35mm but that would have to be adjusted for the weight range to get the rider sag EG if you set the rider sag correctly you might end up with less than 35mm of static sag.

The pds system is extremely sensitive to ride height adjustments, and the static sag must be maintained between 30-35mm's, if you cannot get the correct rider sag within this static sag range then you need a different spring. I have found that 33mm's is the magic number. Once this is set it will work anywhere.

Also, don't try and go outside of the manual's clicker adjustment range. Trying to do so will only result in poor performance at one end of the spectrum. A revalve is in order if you are not satisfied with the suspension action. My bike did the exact same thing as yours does in the rear, it would just blow through the final inches of travel, after feeling like it was firming up, aka becoming harsh, and then you'd hit something big and bang it would just blow through.
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July 8th, 2010, 11:20 AM   #5
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Re: 09/450 fe rear shock

Aw thanx m8 I really appreciate your input
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July 8th, 2010, 12:28 PM   #6
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Re: 09/450 fe rear shock

Any comments on #progressive rate springs"? I was talked into a 7.0-9.0 kg but it was still to soft and ended up with a 7.5-9.5. 46Nm in the front and much better, but I have never riddin a properly suspended bike in my life( so I am not sure just what type of feel I am looking for) but am determined that the Berg is going to be the one.The Berg is much better that my previous 15 or so bikes but I have always just went with a" gas and go" mentality with no real time spent setting up a suspension.235lbs suited up and ready to go.I was wondering if the stock dampening can work with that rear spring?2010 fe390
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July 8th, 2010, 03:00 PM   #7
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Re: 09/450 fe rear shock

Originally Posted by flyinbryan
Any comments on #progressive rate springs"? I was talked into a 7.0-9.0 kg but it was still to soft and ended up with a 7.5-9.5. 46Nm in the front and much better, but I have never riddin a properly suspended bike in my life( so I am not sure just what type of feel I am looking for) but am determined that the Berg is going to be the one.The Berg is much better that my previous 15 or so bikes but I have always just went with a" gas and go" mentality with no real time spent setting up a suspension.235lbs suited up and ready to go.I was wondering if the stock dampening can work with that rear spring?2010 fe390
Hi Bryan,

I am starting a suspension service, and would like to help you out if I can. Haven't decided on a name yet, but, my service will be of a limited nature as I am going to be selective of my clients. This thread, is just one of many that I have read and participated in over the years here at the UHE and I have now decided to do something about it.

PM your number and I will give you a call and perhaps we can get you set up. You are right about the Berg being the one, when set up properly, they are unbelievable.

Dale
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July 8th, 2010, 06:23 PM   #8
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Re: 09/450 fe rear shock

Thanx Dale!!! You are truly "the Man"
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July 8th, 2010, 10:34 PM   #9
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Re: 09/450 fe rear shock

gas and go wow!! never did a saying ring so true, "45 year old man is finally begining to understand how to suspend a bike!" thanx lads
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July 11th, 2010, 06:15 AM   #10
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Re: 09/450 fe rear shock

getting a little closer to final settings, but just have a couple more questions, when i push i'm begining to get pump up in my hands, and the bike is under steering and even washing out at slow speeds on lose stuff, any advice would be appreciated
regards johny
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