Motorcycle Forum banner

1 - 20 of 21 Posts

·
Registered
Joined
·
14 Posts
Discussion Starter #1
I've got a 07 C90 and it say "5-way adjustable spring preload" but how do I adjust it? I need to soften the bike up a little.
 

·
M-J Member of the Month!!
Joined
·
2,758 Posts
Be carefull how much you soften it up. It can bottom out and make things worse. Even cause an accident if it bottoms and you are hard into a corner. The bike should be set up for sag. I am not sure how much travel a C90 has, but on a sportbike it is usually about 30mm.

Oh, when you say, "soften it up", what is it doing? The shock not compressing at all?

Anyway, sorry I could not be of more help. Like I said, I am a sportbiker. Do you have the owner's manual?
 

·
M-J Member of the Month!!
Joined
·
2,758 Posts
I just poked around online and could not find any directions as to how to do it. I could not even find any pictures that would give me an idea. I am sure that someone would be along to help soon.

Congrats on you bike.
 

·
Registered
Joined
·
14 Posts
Discussion Starter #5
I found a older post on here and I'm about to go out side and take a look at my rear shock. I'll take a pic of it too.
 

·
Registered
Joined
·
5,197 Posts
Jack the bike up to get the weight off the rear wheel, and take off the right side gas tank cover. You will see two odd looking brass "nuts" on the upper part of the single rear shock. Use a hammer and drift or long screwdriver to knock the top nut loose- it is just a lock nut. Use the bottom nut to make adjustments- turn it clockwise to make the suspension stiffer for better handling, turn it counter-clockwise to make the suspension softer. Tighten the top nut back down to lock the adjuster in place.
 

·
Registered
Joined
·
14 Posts
Discussion Starter #7
I'm a big guy about 270lbs and 6'4" and when going down the road it doesn't seem to just hit the bumps it fell like it slams the bumps. So I'm going to try softening a little bit.

Here is the top and I see what you are talking about.


Also is ther any way to do this with out jacking up the bike? I don't have a bike jack.
 

·
Registered
Joined
·
370 Posts
If it's similar to the C109 (shock looks the same), there's a panel on the underside of the bike that removes and you adjust it there.
I'm sure you can adjust without a jack, just far less comfortable.
 

·
Super Moderator
Joined
·
12,596 Posts
I'm a big guy about 270lbs and 6'4" and when going down the road it doesn't seem to just hit the bumps it fell like it slams the bumps. So I'm going to try softening a little bit.
As someone mentioned earlier, considering your size, I think you should measure the "sag" first. What you describe sounds a lot like you are bottomed out to start with. Softening the shocks (or spring pre-load) may not make any noticeable difference.......or make matters worse.

If you are down against the stop (or very close to it), then you need to adjust the OTHER way.
 

·
Registered
Joined
·
14 Posts
Discussion Starter #10
I looked at the brass locking rings and they are compressing the rear spring/ shock all the way and I understand about the bottoming out but I just think the stealership was lazy when I bought it. I wouldn't have gone to the one I did but the owner not the salesman gave me a great deal on it.
 

·
Registered
Joined
·
5,197 Posts
It sounds to me like it is set too soft now. Stiffen it up a full turn or a turn and a half and you should feel a big difference.

Oh, and it is not anything like the C109- you can only get to it from the top, and you need to take the weight off the rear wheel.
 

·
Registered
Joined
·
4,883 Posts
Yep, I too would say it is too soft and you need a bike jack to do this one. If you want to ask questions from guys that mostly ride the Intruder/C90 then go HERE. Lots more wrenchers there that live eat and breath these bikes.

BTW, be careful using a screwdriver since it can really cut into the nut. Better off using a brass drift or try and find the actual spanner wrench.
 

·
Registered
Joined
·
14 Posts
Discussion Starter #16
What size spanner wrench ?? Also Frost I tried that site the page is set up really wierd and diifercult to get around but it could just be me
 

·
M-J Member of the Month!!
Joined
·
2,758 Posts
A Suzuki dealer can tell you which size you need.

From reading the posts on how to adjust it, it sounds like a bit of a pain. If you have a couple of buddies that can help you adjust it, you can get the sag close. That way you won't be going back to adjust it as much until you get it dialed in. I have only owned one cruiser in my life and it had twin shocks on the outside and so easy to adjust. Your sag is usually set to about 30% of the shocks travel.

Get a couple of buddies to lift the back of the bike up (Or use a jack if you can. Just make sure if you do that it is not hindering the travel of the swing arm.) and measure from a set point on the bike down to a point on the swing arm. Then, lower the bike, sit on it in the position that you would ride in as a buddy holds the bike upright. Then your other buddy will measure the points again. To increase the sag hight, compress the spring, to lower it, decompress it. After that, you can fine tune it to fit your ridding style.

Setting your sag properly, will make the bike handle better as it will increase the rear ride hight and help the bike to turn better. If you are going to be ridding two-up a lot, since your shock is hard to get to, you may want to set it a little more to the stiff side (less sag).

PS, I looked around online and was not able to find the rear travel for it. Any one know?
 

·
Registered
Joined
·
5,197 Posts
It's really not that complicated. Jack it up, take off the side gas tank cover, adjust it one full turn. Lock it down, take it for a ride. If if feels better but not quite right, go another turn and test drive again. With 20 minutes of trial and error you will find your sweet spot, then put the cover back on and you won't have to touch it again until the shock wears out.

Oh, it is a special wrench that fits the notches on the shock adjuster. I've always just used a drift.
 

·
Registered
Joined
·
4,883 Posts
What size spanner wrench ?? Also Frost I tried that site the page is set up really wierd and diifercult to get around but it could just be me
Just enter as a GUEST if you want. I doubt you would be able to log in unless you do actually register, do so as a basic member otherwise you gotta pay. If you go to the start page there is a ton of info for the LC 1500 and C90, but for now click on "guest" and "start reading". It is a different format as MJ but you will get used to it. Lots of cool sig pics as well.
 

·
Registered
Joined
·
66 Posts
i tried a spanner wrench when i adjusted the shock on my 07 c90t. there isnt enough room to turn it when you get it in there. you need to use a drift and hammer.. im 5 ft 11 and go 280 i turned mine down 2 turns and it rides nice with my wife and myself on it. iots not hard to do and only takes a minute or so......
 
1 - 20 of 21 Posts
Top