Yamaha SR500 & SR400 Forum

GL Performance Network
It is currently Sun Dec 17, 2017 1:13 am

All times are UTC - 5 hours




Forum locked This topic is locked, you cannot edit posts or make further replies.  [ 20 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: Fork ajusters?
PostPosted: Tue Mar 24, 2015 1:04 am 
Offline
Senior Member

Joined: Fri Mar 06, 2015 7:39 pm
Posts: 329
Location: Metro Atlanta, GA
Which fork adjusters would be best for the 2015 SR?
I want to replace the fork springs and add adjusters.

Should I go with heavier fork oil at the same time, or stick with the factory weight oil?

_________________
Screw this, I'm going riding!

"Mulder, toads just fell from the sky."
"Guess their parachutes didn't open."


Top
 Profile  
 
 Post subject: Re: Fork ajusters?
PostPosted: Tue Mar 24, 2015 5:37 am 
Offline
Esteemed SR Elder
User avatar

Joined: Tue Oct 20, 2009 1:36 pm
Posts: 2760
Location: Whitehaven, Cumberland
Not sure if any aftermarket manufacturers supply adjusters, try Webike?

FYI, late model XS650's came with 3 position preload adjusters which will probably fit but they came with shorter springs than earlier models so you've a bit of investigating to do on spring lengths if you want to try those.

Max

_________________
'78 2J4, work in progress & '79 XS650


Top
 Profile  
 
 Post subject: Re: Fork ajusters?
PostPosted: Sat Mar 28, 2015 12:50 pm 
Offline
Senior Member

Joined: Fri Mar 06, 2015 7:39 pm
Posts: 329
Location: Metro Atlanta, GA
I could swear I saw some on Motolanna or Webike.
Whether they fit later SRs or just the earlier ones, I can't remember.
Didn't the early SRs use smaller diameter forks?

The service manager at my local Yamaha dealer suggested that just going to heavier fork oil may give the desired results. I think Progressive fork springs and heavier oil would be more likely to do what I want. Those springs are mushy.
I guess I could add washers to increase preload, for now.
Trouble is, I don't know what type/size washers I need, nor where to get them.

I presume you add washers by removing the fork end caps and dropping the washers on top of the springs, with the forks completely unloaded.

Correct me, if I'm wrong. I can take it.
I've been a professional mechanic for over 25 years.
Just, not a motorcycle mechanic.

_________________
Screw this, I'm going riding!

"Mulder, toads just fell from the sky."
"Guess their parachutes didn't open."


Top
 Profile  
 
 Post subject: Re: Fork ajusters?
PostPosted: Mon Apr 06, 2015 7:27 pm 
Offline
Junior Member
User avatar

Joined: Tue Mar 17, 2015 10:28 am
Posts: 48
Location: Altus, Oklahoma
Correct on adding washers. Heavier oil will slow damping. Same oil and higher pressure will improve damping. More of the same oil in the fork will do the same thing to a point. Thinner will reduce damping. Pressurized forks don't get bubbles so easy so they are more consistent. I've tried pressurized to 7 psi with Ford Type F ATF on my CX500. It worked fairly well but it leaks a bit around the seal.

_________________
'15 SR400
'80 Honda CX500


Top
 Profile  
 
 Post subject: Re: Fork ajusters?
PostPosted: Wed Apr 08, 2015 7:22 am 
Offline
Esteemed SR Elder

Joined: Wed Jun 05, 2013 9:07 pm
Posts: 599
Location: South Jersey USA
Oil damps and springs hold the bike up and you should not ask one to do the other.

My TU had only 3.5 inches of usable travel which is not great, and they were soft like most new bikes.
I found the oil level low, way low, not sure if the dealer fills the forks or its done at the factory.
I tried thicker oil and the forks got worse, harsh and the bump stop was done by increasing the damping a lot, and thicker oil made that feel like metal slamming on metal.
I put thinner oil in at the right level and more preload and got a nice ride for 3.5 inches.
Less air (more oil in the forks) made them more progressive.

The SR got new stiffer fork springs and I kept the stock oil whatever it is, and the forks seem to work well for me, they need a bit more preload for my tastes, but sag a lot less.

Anyone know what weight the stock fork oil is?


Top
 Profile  
 
 Post subject: Re: Fork ajusters?
PostPosted: Thu Apr 09, 2015 11:29 am 
Offline
Junior Member
User avatar

Joined: Wed Dec 17, 2014 12:54 pm
Posts: 20
Location: Dallas, TX
It is 10wt shock oil and the forks are assembled at the factory before they are delivered to the dealer.

_________________
2015 SR 400
1984 KZ550
1971 T500 "Titan"


Top
 Profile  
 
 Post subject: Re: Fork ajusters?
PostPosted: Mon Apr 13, 2015 5:52 pm 
Offline
Senior Member

Joined: Fri Mar 06, 2015 7:39 pm
Posts: 329
Location: Metro Atlanta, GA
So, to replace the fork springs, I just pull out the rubber caps that are on top of the bolts/plugs at the top of the forks, remove the bolts/plugs from the top of the forks, remove the washers and springs-followed by installing the new fork springs and reinstalling the washers, plugs, and caps?
Is that correct?

Are the fork springs exposed to the fork oil?
If so, how do I go about replacing the oil that comes out on the springs? Soak the new springs with fork oil before installing them?

Where is a good place (in the USA) to buy better fork springs for the SR?
I've seen prices all over the place, online, for aftermarket springs.

Thanks for your patience with me. I'm trying to learn everything I can about this bike and how to work on it. I want to do as much of the maintenance/modding myself, as I can.
I know my limits and when to take it to a professional in the field. No worries there.
I just can't afford to pay someone else to do every single thing to it.
Besides, I'm a quick study when it comes to things mechanical.

_________________
Screw this, I'm going riding!

"Mulder, toads just fell from the sky."
"Guess their parachutes didn't open."


Top
 Profile  
 
 Post subject: Re: Fork ajusters?
PostPosted: Mon Apr 13, 2015 7:36 pm 
Offline
Esteemed SR Elder

Joined: Thu Oct 03, 2013 2:01 pm
Posts: 3134
Location: South Central Wisconsin, USA
Of course, be sure to have the front wheel off the floor.
Rather than by quantity, due to the cling you mention, there is a measurement from top lip to oil level within. Hopefully someone here has that for you.
Ive heard repeatedly through the years that suspension oils are 'different' than engine oils so you may want to check that if/when you add or change it.

_________________
1981 SR500 old school 'Caff Racer'
2009 Suzuki TU250X
In all things maintain thy uprightness lest the ground rise up and smite thee.


Top
 Profile  
 
 Post subject: Re: Fork ajusters?
PostPosted: Thu Apr 16, 2015 6:54 pm 
Offline
Senior Member

Joined: Fri Mar 06, 2015 7:39 pm
Posts: 329
Location: Metro Atlanta, GA
I will definitely use fork/shock/suspension oil, instead of engine oil.
I don't suppose I could get lucky enough for fork oil to be the same thing as hydraulic oil.
I stock plenty of that at work, and when I use up a bucket of it, there is always some in the bottom of the bucket that won't come out without cutting off the lid.
I call it "the dregs".
If they were the same, I could use the dregs.
But, I believe the hydraulic oil we use in our forklifts is heavier than 10 weight.
Anyhoo, I'd rather use the exact type oil specified by the factory.
Now, I need to find out what brand/type fork oil is equal to/compatible with the factory fork oil, and where to buy it.

_________________
Screw this, I'm going riding!

"Mulder, toads just fell from the sky."
"Guess their parachutes didn't open."


Top
 Profile  
 
 Post subject: Re: Fork ajusters?
PostPosted: Thu Apr 16, 2015 10:35 pm 
Offline
Junior Member
User avatar

Joined: Wed Dec 17, 2014 12:54 pm
Posts: 20
Location: Dallas, TX
Any 10wt motorcycle fork oil should do it, I would use bel-ray or silkolene. Or you could stick to the Yamaha stuff, it isn't too expensive. Just make sure if you get the Yamaha stuff to get the 10wt in the black plastic bottle, don't let the guy sell you on one of the metal bottles from Yamaha that are all written in Japanese, those are just for certain Yamaha dirt bikes and that stuff is expensive. You should be able to pick this stuff up at any motorcycle dealer.

_________________
2015 SR 400
1984 KZ550
1971 T500 "Titan"


Top
 Profile  
 
Display posts from previous:  Sort by  
Forum locked This topic is locked, you cannot edit posts or make further replies.  [ 20 posts ]  Go to page 1, 2  Next

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group
SR 500 forum

Promote Your Page Too VigLink badge