Suzuki SV650 Riders Forum banner

Converting SV forks to cartridge via F3 forks

29415 Views 58 Replies 33 Participants Last post by  triton
The front suspension was in need of an upgrade I wanted something that was more adjustable so I could set up the bike better. so I looked into a fork swap, but thats some serious $$$, then I looked into cartridge emulators, which are very adjustable, but not that easy to adjust (I also ride in weather from 35 to 95 degrees and I didnt want to have to run thicker oil) Plus these forks were about half what the emulators cost.

My main objectives is to make my bike work better without spending to much money (I own a house so money is tight). My riding consists of rough Maine roads and no track time, some commuting, two up and some fast fun.

Things to keep in mind:
1. I have not ridden this bike since I have done this mod, its winter in Maine.
2. I started it 2 weeks ago, and I am still putting the finishing touches on it.
3. I may have ADD, wanna ride bikes?
4. I am not the first person to do this, this was not my idea.
5. The F3 fork is 2" longer then the SV fork, meaning it will stick out above the tripples, if you have a "N" then you will need to change your bars. I will be putting clip-ons above the tipple.

You are going to need to suspend the front end before you take it apart:


Here are some of the tools I used:

Fork seal driver, new fork oil, grease, fork oil level adjuster, some allen wrenches, yada yada yada. If you are going to replace your seals or bushings now would be the time.

The whole idea is that the F3 forks are the same make (SHOWA) and same diameter as the SV forks (41mm). One crucial difference is that the F3 forks are cartridge forks, and you can adjust the rebound externally. 94 F2 forks and 95-98 F3 forks are what you will need. Going into this my biggest concern was the size of the bolts at the bottom of the fork legs, the ones that hold the cartridge/damping rod in place. Wasnt I pumped when they turned out to be the same size



For those of you are thinking "what bolt is he talking about?":


Its a pretty easy mod, you need to get a set of F3 forks, take your forks off of your bike and pull them apart. If you dont have a vice this might be more
difficult.

Here is a side by side shot:


You will need some of this:


Once you get your forks apart it should look like this SV on left, F3 on right:


Now all you need to do is put whichever bushings you are going to use on the F3 fork tube and slide it into the SV leg. You will need the fork seal driver to put the upper bushing in place, as well as the fork seal.



Once this is done You will need to put the F3 internals into the your hybrid fork (the oil in my F3 forks was gross, so I took some extra time to clean up the parts the best I could we primed the F3 internals with new clean oil to help get the old out). Put in your new oil, check the level, bolt up the cap and remount to your bike.

Keep in mind, the front end needs to be lowered so YOU WILL HAVE TO CHANGE YOUR BARS, because she is sitting high right now.



and your done

PS Since I have gotten some PM's recently pertaining to my Avatar, its my Girl Friend I have a sausage...Just like everybody else on this forum
See less See more
11
1 - 20 of 59 Posts
Nice!!!

I can't wait for your report on how they feel. Are you gonna try 10W fork oil (looks like it from the picture with the fork oil)?

What kind of clip ons? Something with zero rise to lower the bars, or something with rise that will mimic the naked bar height?

tk
Do you think it would have been possible to use the F3 guts with the SV upper fork tube if the existing spacer from the SV was cut down to accommodate for the shorter upper tube?

Do you know if the adjusters would screw into the SV tube?
If it works out it could be a good mod for those who want better suspension AND higher rise clip ons....let us know how it works out once you defrost.
Do you need a vise to get the fork caps off with the forks off the bike? Also, do I need to take the fork apart in a specific sequence?
How much travel do the forks have now??
How much travel do the forks have now??
Should be same as stock F3, he used F3 tubes.
Should be same as stock F3, he used F3 tubes.
But with the SV sliders. I've heard that you end up with reduced travel, so that's why I asked. :)
Why would you have less travel? Tube will hit bottom of fork on full compression (which is also bottom of cartridge) and extend up to external top out spring.
When you use stock sv tubes you have to compress cartridge to get cap screwed in because tube is shorter. Or you need to shorten cartridge to get all travel.
Why would you have less travel? Tube will hit bottom of fork on full compression (which is also bottom of cartridge) and extend up to external top out spring.
When you use stock sv tubes you have to compress cartridge to get cap screwed in because tube is shorter. Or you need to shorten cartridge to get all travel.
I don't know, I haven't done this myself. :) There was a thread on this though about 6 months ago, and someone posted that they had heard from a good source that you lost travel. So that's why I'm asking.
If you use stock tubes and don't shorten cartridge you do. Or if you use shorter cartridge than stock tube can extend (like gsxr).
Think how it works. Cartridge is what limits travel and dictates how much you will have. Cartridge is bolted to bottom of fork, same spot damper rod is bolted to. On either fork inner tube can only travel up to that point where it hits bottom of outer tube (assuming no oil lock pieces for now). It can also extend only as much top out spring will let. You basically have one bolt on bottom holding cartridge to lower fork and fork cap holding cartridge to inner tube on other end. If you don't have to push cap down to the point you loosing travel you are fine, or if you don't have to push inner tube down because cap is to low you are also fine. On regular cartridge forks top out spring is external (on outside of cartridge body) and limits extension of tube which is less than inner cartridge rod/cap so you will have to push cap down to screw in tube some but not enough to affect travel since you not pushing tube away from top out spring. If you even had one of this forks apart you can notice there is no preload on spring until you screw cap in.
On USD forks top out spring is inside cartridge, on back side of rebound valve. Only thing holding outer tube from sliding up and apart from inner is cap. In both forks one tube (inner on regular and outer on USD) is free floating, just riding on bushings, cartridge itself limits their travel.
So, if cartridge is fully extended when fork is assembled you will have full travel.
See less See more
Winter project idea......subscribed for reminder, curious on end results/ride report?

Regards
Darryl
I just did this. It's definately a worthwhile mod on the cheap. I also swapped out the stock F3 springs with sonics. At the same time, I swapped in a zx10r rear shock.

The bike is firmly planted and both ends feel secure. No pogo action at all. The most noticeable difference is that leaning in turns never give me the feeling that the rear is trying to come out from under me.

I'm using stock clipons on top and I don't get full lock due to the DLR handguards.

Great, great mod.
how would these forks be tunable? there is the externally adjustable rebound, but to change compression, would you need to experiment with oil weights or shims?
I'm going to re-ask a couple of questions to go along with the ones Dichotomous asked. Can you just put those guts into the stock SV forks and use shorter spacers so they fit? If so, that would eliminate the need for changing from bars to clip-ons on a naked. Also, I don't want that much tube sticking up past the top triple on my S.
Can you please tell me if F3 fork seals are the same as SV fork seals?
Can you please tell me if F3 fork seals are the same as SV fork seals?
Yes, same as 2nd gen.
Yes, same as 2nd gen.
Thanks guys.
Used an F3 fork seal in my SV forks and it worked out beautifully
1 - 20 of 59 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top