ZX14 Forks on ZRX

[skandix]

Well, I finally pulled the trigger on some ZX14 forks. And received yesterday. I know there are a few other members who have done the mod, with some detail. I wll try to add to that. So far what I have found out for myself. Oh yeah, feel free to add information and ask questions. It would be nice to get a thread that is definitive on modern USD fork conversion.
1. Stock Rim and axle with 310 rotors fits fine between the light way Calipers.
2. Fork legs are about 3/4 of and inch shorter. I will take exact measurements later.
3. ZX stem is way to long and of course thicker. I haven't set it in the neck yet to see if smaller bearings would work, but that's next on the list.
4. Using the Stock ZRX speedo might work, I have one coming from ZRXRich.
It will be a very tight fit if it does. Might have to go way of GPS. Custom spacers have to be made for both sides. Photos of setup Right and Left center.
Next is to make Triple Tree using Stock ZRX and ZX14 Tree.
When pressing the stem press it down.

List of Parts needed to converst to ZX14 Forks.

Triple Tree Stem from ZRX..

1. Entire Triple Tree from ZX14.
2. Stock ZRX Handle Bars, Risers and Aluminum Bushings as spacers.
3. Upper TT Bushing made from ZX14 stem.
4. Optional ZX14 Master Brake , Clutch, Throttle Cables Unit, Right Pod.
5. ZX14 Forks, Axle Right Spacer and Custom Spacer washer.
6. ZRX Speedo unit modified.
7. GSXR 1000 front fender.

[sillyhillbilly]

Well, I finally pulled the trigger on some ZX14 forks. And received yesterday. I know there are a few other members who have done the mod, with some detail. I wll try to add to that. So far what I have found out for myself. Oh yeah, feel free to add information and ask questions. It would be nice to get a thread that is definitive on modern USD fork conversion.
1. Stock Rim and axle with 310 rotors fits fine between the light way Calipers.
2. Fork legs are about 3/4 of and inch shorter. I will take exact measurements later.
3. ZX stem is way to long and of course thicker. I haven't set it in the neck yet to see if smaller bearings would work, but that's next on the list.
4. Using the Stock ZRX speedo might work, I have one coming from ZRXRich.
It will be a very tight fit if it does. Might have to go way of GPS. Custom spacers have to be made for both sides. Photos of setup Right and Left center.
Next is to make Triple Tree using Stock ZRX and ZX14 Tree.
Question: When pressing the stem out, which way do you press out?

1. try looking at MFP's thread on doing the showa forks from an zx6, just look see at what the upper tripple tree has to look like, and contrary to your orgional post, you aint the first, and there r threads with details to do this.

[skandix]

Sillyhillbilly, Never said I am the first to do the Mod, no way could I even attempt this mod without those who have already done it, probably done way back in 2002 with ZX9 forks by Purgaraptor. And there are a few more here that are posting and have posted modern USD fork setups. I am just wanting to contribute to the forum on my setup with as much stock components as possible. Looking forward to some insights, and comparisons. All the help would be appreciated.

[Hawk1]

[Joe B]

Those ZX14 forks should work pretty well

IIRC.......the ZX14 fork spacing is the same as the ZX10, which is 210mm.
That means you should be able to get the speedo drive to work, but the drive and the inside of the fork lower will have to be machined for clearance along with new spacers.

Keep us posted

[Gearhead119]

stem presses out through the bottom. or top if you remove the c clip... you have to press it down about 1/2 " to get the c clip off.. then it will go either way... once you've gotten it out that far though it's easy to just keep going..

[skandix]

Thanks Gearhead, just saved me a stem, hows the GXSR USD coming along?

Joe B. what size did you end up making the right spacer? was the rim you used the same size (width) of the REX?

[Joe B]

IIRC.........We took .050 off of each side of the drive and .090 from the fork leg.

Basically what you want to do is to take the max you can from the drive. Then install the wheel without the spacer or drive and center the wheel in the brake calipers.

Measure for the right hand spacer.
Measure the available space on the left side, and then figure the difference between that and the dimension of the speedo drive.......that will be how much you will need to take from the fork lower.

[skandix]

Cool!! Thanks for the info! I will be needing more as this progresses.

[skandix]

I had a set back today. I put on meaty a 310 Rotor locked down and measured again, before the surgery Tuesday. Can't get the rotors centered into the calipers. Same issue as Gearhead119 with his Gixxer forks. Off by 2.07mm . I still have about 1.5mm clearance on the outer tight side. Any consequence with brake pads not being centered?

[schmoo]

I had a set back today. I put on meaty a 310 Rotor locked down and measured again, before the surgery Tuesday. Can't get the rotors centered into the calipers. Same issue as Gearhead119 with his Gixxer forks. Off by 2.07mm . I still have about 1.5mm clearance on the outer tight side. Any consequence with brake pads not being centered?

Is it the side with the speedo drive ? Probably going to have to trim the speedo drive (on the wheel) thingy down some or go with different speedo .
At least you are lucky if your rotor spacing is coming out right . My Triumph and Aprilia wheel conversions will need rotor spacers to get them to the correct width.

[Joe B]

Confirm that I am understanding what you are saying here...........the rotor center to center spacing for your ZRX wheel is too wide for the ZX14 forks? Thus shifting your pads to the outside of the calipers. Or is it that the whole assembly is off center to one side?

As far as the consequences of the calipers not being centered perfectly?
I really doubt that most of them are perfect. The question is how much is too much.
So your're saying that the discrepancy is 2.07mm.....~.080?
How are you getting that measurement?

[skandix]

Confirm that I am understanding what you are saying here...........the rotor center to center spacing for your ZRX wheel is too wide for the ZX14 forks? Thus shifting your pads to the outside of the calipers. Or is it that the whole assembly is off center to one side?

As far as the consequences of the calipers not being centered perfectly?
I really doubt that most of them are perfect. The question is how much is too much.
So your're saying that the discrepancy is 2.07mm.....~.080?
How are you getting that measurement?

Is it the side with the speedo drive ? Probably going to have to trim the speedo drive (on the wheel) thingy down some or go with different speedo .
At least you are lucky if your rotor spacing is coming out right . My Triumph and Aprilia wheel conversions will need rotor spacers to get them to the correct width.

I haven't trimed the speedo drive yet. I will do it this week. What other speedo drive do you think will work?
Love to see your T/A conversion.

[skandix]

Confirm that I am understanding what you are saying here...........the rotor center to center spacing for your ZRX wheel is too wide for the ZX14 forks? Thus shifting your pads to the outside of the calipers. Or is it that the whole assembly is off center to one side?

As far as the consequences of the calipers not being centered perfectly?
I really doubt that most of them are perfect. The question is how much is too much.
So your're saying that the discrepancy is 2.07mm.....~.080?
How are you getting that measurement?

Sorry, for the misunderstanding, I let my frustrations get the best of me. I have an extra 04 ZRX wheel with 320 Rotors. I used this as my setup no tightening of bolts. When I did the initial setup, I used washers under the calipers for the height of the 320 rotors. Wheel was centered perfectly between the forks(no spacers), the rotors almost lined up dead center in the calipers off by .86mm, I used a feeler gauge and caliper to measure. I was like Awesome ! I took the wheel off my 01 Zrx with 310 (very little wear on rotors) rotors, put it in the forks with the stock right hand side spacer, wheels centers perfect in between the forks, start to measure for the shave of the speedo drive, put the calipers on for good measure and find that rotors are to close (not centered)to the outside caliper. They are about 1.57mm away from the outside of caliper on right side and 2mm on left.
I read that Radial Breaks have a self centering ability to rotors like no other. I hope this works to my benefit.

[schmoo]

I haven't trimed the speedo drive yet. I will do it this week. What other speedo drive do you think will work?
Love to see your T/A conversion.

I'm going to use an electric speedo with magnet , either a Sigma bike speedo and my ZX9 gauges or a Trail Tech Veypor instrument cluster. I will post pictures in a while almost done the Triumph front wheel / ZX6RR USD conversion. The Triumph front rotors were 3/8 inch too close together and needed to be spaced to center in the calipers.

[KillerKaw]

call me ...Ive done it.

[Gearhead119]

When I had my wheel together.. I left the wheel spacers out and just had the axle through the wheel... I mounted one caliper on the fork leg and centered the rotor... the rotor was 6mm from the fender bracket and the opposing rotor was 2mm from the opposite bracket... I removed and mounted the other caliper, centered rotor again... and again 6mm and 2mm... so either one side has to loose 4mm to give me the 6mm and 6mm (which will offset the tire a little ) or take 2mm off each side... I didn't get my calipers out... just my machinest ruler but I measured 3-4 times both side and the 2/2 will work fine for me... I can fidge it a few thousanths either way and never notice a thing...

[skandix]

When I had my wheel together.. I left the wheel spacers out and just had the axle through the wheel... I mounted one caliper on the fork leg and centered the rotor... the rotor was 6mm from the fender bracket and the opposing rotor was 2mm from the opposite bracket... I removed and mounted the other caliper, centered rotor again... and again 6mm and 2mm... so either one side has to loose 4mm to give me the 6mm and 6mm (which will offset the tire a little ) or take 2mm off each side... I didn't get my calipers out... just my machinest ruler but I measured 3-4 times both side and the 2/2 will work fine for me... I can fidge it a few thousanths either way and never notice a thing...

So, your rotors are not centered in the calipers and are 2mm to the outer calipers? Wheel of course is centered? I sometimes over analyze simplicity. This is how my setup is now. Wheel centered.

[Joe B]

call me ...Ive done it.

There you go

[skandix]

Well, here is an update on the forks. I decided to go with the stock wheels, probably swap them out later. I was able to center the wheel in the forks and use the speedo. All custom work except the1 ZRX spacer. I used a zx11 speedo. The wheel is .21mm off center. Rotors are almost center in the Calipers. The Forks are slightly heavier then stock by 1/2 a pound combined. Thanks Mr K. @ OCC for the machine time.







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[skandix]

I updated the parts list for this mod as I had a few people ask me to.
If you are going to use the ZX14 Master Brake and Clutch reserve, there is electrical work that is needed. Basically I removed the ZX14 Pins from there housings, figured the wiring using the ZRX schematic, used mold release agent and covered the assembly with Silicone. Extremely moisture tight & vibration proof. The Clutch has to be held in to start the bike.
I am running ZX9 Carbs so the ZX14 cables worked with no issues.

[Kawi Vandal]

Might be something for the model years, but I found the zx14 forks were lighter than stock.

[Redrodent]

Yes, I weighed the entire assembly without the wheel vs. the zrx. Brakes, masters, axle, forks, triple, and lines. 3 lbs lighter than stock.

[skandix]

Yes, I weighed the entire assembly without the wheel vs. the zrx. Brakes, masters, axle, forks, triple, and lines. 3 lbs lighter than stock.

My Stock ZRX forks had Race Tech springs (Shorter) and PVC spacer with 7W oil. I think that made them slightly lighter. But the entire assembly was definitely lighter as stated Redrodent.

[Skrappy]

Pics of the handle bar setup and the ZX stem bushing? I already have the ZX14 wheels so I think I will be ok as far as not having to run spacers and measuring to get the wheel centered. Should just bolt right up but just want to see where you drilled for the handle bar clamps and how you made the bushing from the ZX stem. Thanks

[John T]

Pics of the handle bar setup and the ZX stem bushing?

just want to see where you drilled for the handle bar clamps and how you made the bushing from the ZX stem. Thanks

When I did mine,
I cut the 14 stem flush and used the measurements to make a bushing out of steel.

I then welded it to the bottom of the zrx stem. also cut a piece of the 14 stem to make a bushing for the upper tree.

for the bars I used a one off bar mount made by kawi vandal stan the man.

trimmed about 1/4" on each side of the steering stops.... and hogged out the steering lock a tater bit.... they both work fine.

[zrxrob]

I have aluminum brackets I made to run a gsxr750 front fender.I have a couple spare sets if you want to go that route

[skandix]

I made my Stem like John-T, using both the ZX14 for both upper and lower TT bushings. For the upper TT, I will get some picks posted.

[Kawi Vandal]

Pics of the handle bar setup and the ZX stem bushing? I already have the ZX14 wheels so I think I will be ok as far as not having to run spacers and measuring to get the wheel centered. Should just bolt right up but just want to see where you drilled for the handle bar clamps and how you made the bushing from the ZX stem. Thanks

Kwick has everything but the blocks. Any machinist with a mill a drill for an m8 tap a flat end mill a 7/8" ball end mill and a .251" ream can make them.

[Skrappy]

Well can you get some made for me? I will pay but you see I live in Okinawa Japan and there arent any machine shops out here.