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Title: rear sag numbers Post by: MotoPsycho on June 04, 2008, 09:30:03 PM 99 M750:
I've never set the rear sag up properly, what are the correct numbers for proper sag & stuff ? Front end it Marzocci, so I'll have to deal with it. Title: Re: rear sag numbers Post by: ducpainter on June 05, 2008, 03:51:06 AM 99 M750: You can re-spring Marzocchis.I've never set the rear sag up properly, what are the correct numbers for proper sag & stuff ? Front end it Marzocci, so I'll have to deal with it. Loaded sag for the street should be about 1 1/8 - 1 1/4 " Adding preload is not the best way to achieve it. Title: Re: rear sag numbers Post by: mihama01 on June 05, 2008, 04:10:11 AM Dude, proper SAG and stuff?
Well there is a manual for Model Year 2000 Monsters on ducati.com that give the correct damping setting for the 750 but nothing on default preload or rear ride height however. http://www.ducati.com/en/bikes/service/manuals/2001.jhtml?family=manuals Basically the only thing you can do is increase/decrease the preload on the rear spring and that should affect sag. If you can't get exactly what you want then you will need to change the spring rate i.e. change the spring What sag should you use? Thats up to you, but the following link explains a ball park figure to aim for. http://www.gostar-racing.com/club/motorcycle_suspension_set-up.htm Having said that may be worth splashing out on a new rear shock/fork oil change since it is likely the damping is past its best after 9 years. Additionally it is generally recognized that increasing the rear ride height may help speed up the steering, at the cost of some stability. It is something to do after you have got the suspension working properly. The ride height is not the same as SAG Hope that is useful! Title: Re: rear sag numbers Post by: mihama01 on June 05, 2008, 04:16:50 AM Gotta love this board
ducpainter says Quote Adding preload is not the best way to achieve it. and I say Quote Basically the only thing you can do is increase/decrease the preload on the rear spring confused? I am ;D Seriously, it all has to do with the anount the rear sinks under the weight of the rider and the bike. Getting the correct spring is the best policy, setting preload is the cheapest option but may not give the optimum result. i.e. you may not be able to get both rider and static sag to reasonable values without changing the spring. Feel free to correct me if I am wrong....ducpainter Title: Re: rear sag numbers Post by: ducpainter on June 05, 2008, 04:26:07 AM I was told by Bruce Meyers that the optimum pre-load for a spring is about 15mm.
If you have to add significantly more than that the spring is the wrong one for your weight. You may achieve the correct loaded sag, but the spring won't perform as well as one that isn't over pre-loaded Everything else Bruce ever told me was true, so I believe it. |