Fork Modification - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 20 Old 02-10-2004, 11:36 AM Thread Starter
 
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Fork Modification

I'am considering to upgrade the forks on the VS. I weigh 245lbs and the bike wallows when pushed hard. I still want to take the bike on bumpy gravel roads though.

What I mean by wallowing is the suspension feels mushy. When pushed hard the suspension seems to move excessively over it's travel. It neither bottoms out or tops out.

Questions:

- It sounds like the Wilbers Progressive springs are a good Improvement, but will they be too firm for gravel roads.

- I own a 02 and am considering putting on the 03 + preload caps. How much preload adjustment is there with these caps.

- Is it worth revalving the forks.

Any other ideas would be appreciated.

Scooter
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post #2 of 20 Old 02-11-2004, 01:40 PM Thread Starter
 
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Springs

Original 02 fork springs are .760Kg/mm. Race tech recomends .862Kg/mm springs. Does anyone know what the Progressive Wilbers springs measurements are.


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post #3 of 20 Old 02-11-2004, 02:33 PM
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Re: Springs

Quote:
Originally Posted by scooter
Original 02 fork springs are .760Kg/mm. Race tech recomends .862Kg/mm springs. Does anyone know what the Progressive Wilbers springs measurements are. Scooter
A buddy of mine just replaced his fork springs with the 1 Kg race techs and he's about your weight. You may want to go a bit stiffer. When I drove it last weekend, the front end felt a LOT more solid than the stock bike with my 200lbs at the helm. Prolonged bumpy sections of road, where the 'Strom front end tends to get overwhelmed, were completely under control.

According to the Racetech site, at my weight, I should use the 0.95 Kg/mm springs which seems about right as the 1Kg springs were a little too stiff at my weight for long range riding comfort.
 
post #4 of 20 Old 02-11-2004, 07:17 PM
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Racetech springs

Also, Racetech springs are straight rate springs, NOT progressive. I had Racetech .85s in my SV and they were excellent. I plan on putting some .90s in the Strom. I prefer a straight rate over progressive, myself.

FYI.

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post #5 of 20 Old 02-15-2004, 08:27 PM Thread Starter
 
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Shocks

Kg/mm Spring Rate Chart .

http://www.traxxion.com/technical.springrate.shtml

Just add on your weight to the wet weight of 510lbs for the VS.

In my opinion I think progressive springs would work well on the VS. It would give you a softer ride for touring at the beginning of the compression of the spring then begin to get firmer as it was compressed.
Consistently coiled springs are more easily understood when deriving technical data.

Start slow with your fork tweeking and do one thing at a time. A good starting point is to measure the Sag. Tolerance for a road bike should be between 30 - 35 mm. Sport bike or race bike 25 - 30 mm for fork Sag.


My first starting point is to put the Preload caps from the 03 on my 02.
Part # can be found on DL F&Q .com. You need five parts x 2 for both forks. Adjuster,O-ring,fork bolt, nut, and spring seat.

I will check the Sag and see if it can then be put within tolerance with the preload adjustments. You can get 1" of preloading with the 03 preload set up. If this does not work I will then move from a 7 weight oil to a 10. If this doesn't work then it's time to consider a firmer Kg/mm spring.

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post #6 of 20 Old 02-18-2004, 11:52 PM Thread Starter
 
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Fork Springs

I'm trying to get some useful data on fork springs. Contacted Touratech
about their Wirth Progressive Springs. I was rather dissapointed in the info they gave me. They said the springs are a little stiffer then stock. If this is all the info they can give me why would I give my hard earned dollars to this company. Come on Touratech lets make an effort to know about the products that you sell. I want technical data in some shape or form.


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post #7 of 20 Old 02-19-2004, 11:11 PM Thread Starter
 
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Wilbers

Wilbers Fork Springs and Revalving

Here's the data for the Wilbers:

- Stock OME .760Kg/mm consistently wound spring.

- Wilbers .650 Kg/mm to .950Kg/mm progerssive spring.
$123 US Part # 600-285-00

For me being a 240 lbs rider these springs sound correct. The Progressive
Spring sounds like a good choice to me. I use my Strom for sport riding, two up, gravel roads and fully loaded touring. If I used my Strom for just sport riding I would go with a consistently coiled spring. I could make up the intial softness of the spring with more preload. I would go with the Wilbers because you could also match the front coils to a new shock spring.

It is a good idea to revalve the forks while changing the fork oil and replacing the springs. You could probably just change the shims to get what you needed.

I didn't get any info from Race Tech, but I'm presuming that they have various springs that would work for the VS. They also sell Gold Valves, and high quality fork oil.

Wilbers main distributer in the US is http://www.run-n-lites.com. It sounds like Klaus Huenecke is a good guy to deal with. E-Mail at [email protected]


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post #8 of 20 Old 04-10-2004, 03:20 AM Thread Starter
 
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Fork oil

If anything I have learned on the suspension is to do adjustments one at a time. I own a 02 VS, as of April 3 the bike has been in a accident ( forks I presume are bent). I will try the 10W oil in the forks, instead of the OEM 7-8W when the bike is being repaired.

I had just installed the spacer into the rear shock. Running about 3 clicks below the highest adjustment from the top. When the rear shock was stock, I had the preload set to the highest.

I think with these adjustments the bike will have improved handling for the heavier rider.

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post #9 of 20 Old 04-12-2004, 08:40 PM
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Re: Fork oil

Quote:
Originally Posted by scooter
If anything I have learned on the suspension is to do adjustments one at a time. I own a 02 VS, as of April 3 the bike has been in a accident ( forks I presume are bent). I will try the 10W oil in the forks, instead of the OEM 7-8W when the bike is being repaired.

I had just installed the spacer into the rear shock. Running about 3 clicks below the highest adjustment from the top. When the rear shock was stock, I had the preload set to the highest.

I think with these adjustments the bike will have improved handling for the heavier rider.

Scooter
Hey Scoot!

I did Progressive Suspension's fork springs with 15W fork oil. The combination is absolutely magical. Well damped, less vibration to the grips, front-end dive-free, plush but not mushy for long distance and unflappable (North Cascades Highway at 60-100 mph last Saturday). Wow! What a ride!
post #10 of 20 Old 04-15-2004, 12:15 PM Thread Starter
 
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Data

Received the info on the Progressive Suspension springs.


Progressive Suspension Springs part # 11-1144

.710 Kg/mm to 1.16 Kg/mm


Wilbers progressive springs

.650 Kg/mm to .950 Kg/mm


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