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Uzi new blog, here is the first entry, and goal. Topic: fork spring rates
The Suzuki SV650 1999-2007 models, use the same fork springs (basic diameter and length) as the Bonneville, and Thruxton of all model years:
The correct spring rates for street riding based on riders wt.*:
Stock spring rate .75 kg/mm this is correct for a 60lb. rider!
80 lb. rider the rate is .80kg/mm
115 lb. rider the rate is .85kg/mm
150 lb. rider the rate is .90kg/mm
180 lb. rider the rate is .95kg/mm
215 lb. rider the rate is 1.0kg/mm
250 lb. rider the rate is 1.05kg/mm
280 lb. rider the rate is 1.10kg/mm
315 lb. rider the rate is 1.15kg/mm
350 lb. rider the rate is 1.20kg/mm
Correct spring rates for racing:
40 lb. rider the rate is .80kg/mm
70 lb. rider the rate is .85kg/mm
105 lb. rider the rate is .90kg/mm
135 lb. rider the rate is .95kg/mm
170 lb. rider the rate is 1.00kg/mm
205 lb. rider the rate is 1.05kg/mm
235 lb. rider the rate is 1.10kg/mm
270 lb. rider the rate is 1.15kg/mm
305 lb. rider the rate is 1.20kg/mm
* This is based on a standard wt. bike without lightening modifications.
Pick the closest for the rider wt. going down if in the middle of a range if you want a softer ride, and up to the next step, if you ride a little harder.
With no other modifications, use the stock fork oil wt. and level.
Getting the right spring is the first step in improving the front end.
The absurdly low rider rates are listed, to show how under sprung the Bonneville is from the factory!
When using the Suzuki sv650 springs, start by cutting the spacers so that they are about 1/4" above the top of the fork tubes with the forks fully extended. Measure the sag and then shorten the the spacers the amount that the sag needs to be increased. You should look for a sag of about 30-33% of the travel for street riding, or about 25% for racing, and hard charging.
Check back for the next topics: cartridge emulators, fork oil wt., preload adjusters, Brakes, rear shocks, and interchangeable parts that will save you money.
I am trying to build a data base in this blog that will help find interchangeable parts, with other factory, and after market parts to substitute for the factory parts, for economy, and or increased performance.
Pm me with interchangeable parts you have found, and we will see about adding them to the blog, Hopefully it will grow.
This is not to replace any other blogs but will be focused on the above goals.
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"Peter, It seems like you have been missing a lot of work recently, well Bob I wouldn't say that I've been missing it"
ENOUGH, go out and ride!
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