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shinyribs

Raising forks internally?

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shinyribs

I haven't been inside my forks other than to change the oil. I'm not sure how these are constructed. Is there a top-out spring that can be done away with/ modified in order to raise the stock forks any? Any compatible/ drop-in fork stanchions from other bikes that are longer?

 

I'm slowly gathering parts and ideas for some work I want to do to my bike ( scrambler setup) , and I'd really like to raise the bike about an inch. I'm happy with the forks and have no reason to consider a fork swap. I've done plenty of those in the past and just am not interested in that for the FZ. 

 

Looking at this it seems doable...I think... but I'm not sure how much height is possible to gain. Or if other problems would arise ( bushing locations?).

 

https://www.partzilla.com/catalog/yamaha/motorcycle/2016/fz07-fz07gs/front-fork

 

Any ideas or suggestions would be great. Thanks!

 

 

Edited by shinyribs

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firstyammerha

Many years ago, I used cylindrical spacers that were the outside diameter of the damping rod and drilled down the center to take a longer stock bolt. The internal area of these cylinders was unthreaded.I experimented with 1" and 1.5" lengths with good success.You have to be careful not to extend the slider too far down the stanchion tube and reduce the over lap of these two components. There was a way to determine over lap but I forgot how to arrive at this number. As I recall 4" was the minimum overlap needed to keep the fork rigid and safe. I don't recall where I got the spacers and bolts but it may have been the local Home Depot or Lowes.Hope this helps.

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shinyribs
59 minutes ago, firstyammerha said:

Many years ago, I used cylindrical spacers that were the outside diameter of the damping rod and drilled down the center to take a longer stock bolt. The internal area of these cylinders was unthreaded.I experimented with 1" and 1.5" lengths with good success.You have to be careful not to extend the slider too far down the stanchion tube and reduce the over lap of these two components. There was a way to determine over lap but I forgot how to arrive at this number. As I recall 4" was the minimum overlap needed to keep the fork rigid and safe. I don't recall where I got the spacers and bolts but it may have been the local Home Depot or Lowes.Hope this helps.

So actually just spaced the damper rod up and away from the bottom of the fork slider. That's a beautifully simple approach. It's seems so obvious now that I'm embarrassed it never occurred to me lol. 

 

Thanks a lot for that idea. I'll have to take a look and see if that method will work on these forks, too. 

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phanomenal07

Will you have to raise the rear too?

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shinyribs
10 minutes ago, phanomenal07 said:

Will you have to raise the rear too?

I'm planning to raise the rear, yes. 

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twf

Shorter top out spring

Spacer replacing oil lock piece

Taller fork caps

Longer inner tubes

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firstyammerha

the cylindrical pieces I used fit into the oil lock piece(bottoming out cone) and pushed the damping rod up and the sliders down so the stanchions could be moved up in the triple clamps. This was a tuning aid when I was mx'ing way back when. Thinking more on this, I may have had to get the hex head bolts from the local HD or Lowes machined to a circular shape head to fit in the bottom of the slider and a blade screwdriver slot milled into the bolt head so the damping rod could be unscrewed.

Edited by firstyammerha

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twf

Can't fit it in oil lock piece on fz07. You would want to replace it because stock one is plastic. You would also need to make sure it does not interfere with tube. Could also make it so it has same function of stock one.

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faffi

As long as you have enough overlap, lengthening the damper rod is a simple and cheap way to gain fork travel. Back in the 70s, there were those who sold longer damper rods for bikes like the RD350, helping those who couldn't be bothered to make spacers. These special rods also featured altered damping for more control around race tracks.

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pattonme
On 2/11/2018 at 4:48 PM, shinyribs said:

I haven't been inside my forks other than to change the oil. I'm not sure how these are constructed. Is there a top-out spring that can be done away with/ modified in order to raise the stock forks any? Any compatible/ drop-in fork stanchions from other bikes that are longer?

 

Any ideas or suggestions would be great. Thanks!

R3 stanchions are longer by about 15mm 25+ I believe and the R3 damper rod is much better quality compared to the FZ07 part.

But what you really want to do is install '95-7 ZX6F fork uppers in your lowers. Not only do you get full-tilt cartridges but they are longer by 610-574=36mm. '99-02 SV650 tubes are 589-574=15 longer. The mid-gen EX650 is about 20mm longer but different editions have some variance.

 

I have a few sets of the ZX6F if you're interested in that route. Plus you can have me clean and revalve them to suit you.

Edited by pattonme
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shinyribs
19 minutes ago, pattonme said:

R3 stanchions are longer by about 15mm I believe and the R3 damper rod is much better quality compared to the FZ07 part.

But what you really want to do is install '95-7 ZX6F fork uppers in your lowers. Not only do you get full-tilt cartridges but they are longer by 610-574=36mm. '99-02 SV650 tubes are 589-574=15 longer. The mid-gen EX650 is about 20mm longer but different editions have some variance.

 

I have a few sets of the ZX6F if you're interested in that route. Plus you can have me clean and revalve them to suit you.

Great info! Thank you. 

 

The ZX6F tubes, can I reuse my springs? My sag numbers are spot on for me as things are. How price are we talking about on them, with and without revalving. 

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pattonme
27 minutes ago, shinyribs said:

The ZX6F tubes, can I reuse my springs?

Should. There are 2 versions of the ZX6F - thick wall and normal. I think it was the '95 that had the heavy-duty walls and no, won't fit in those. Anyway I can dig thru the pile and find a suitable combo. You have Sonic springs?

 

Well, let me just say you don't want to use them as-is. The valving needs an overhaul. But more importantly the oil and crud in these since they're old requires a full tear down and once you're doing that you might as well finish the job. But if you want to take all that on, I won't stand in your way.

 

Pricing installed in your forks and shipped back to you is around $350.

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shinyribs
3 hours ago, pattonme said:

Should. There are 2 versions of the ZX6F - thick wall and normal. I think it was the '95 that had the heavy-duty walls and no, won't fit in those. Anyway I can dig thru the pile and find a suitable combo. You have Sonic springs?

 

Well, let me just say you don't want to use them as-is. The valving needs an overhaul. But more importantly the oil and crud in these since they're old requires a full tear down and once you're doing that you might as well finish the job. But if you want to take all that on, I won't stand in your way.

 

Pricing installed in your forks and shipped back to you is around $350.

I've got stock springs and I'm 240lbs geared up. Laden sag is 35mm. I'm running 12w fork oil and I've reduced the air gap, but I don't remember by how much. I'm completely satisfied with how the suspension is working ( CBR600RR shock out back - 32mm laden sag w/o luggage). Using the good ol' ziptie method I've been watching fork travel for the past 2k miles and I've not used all of my available travel yet! I was ready to spend money on the fork recently due to the bike feeling wallowy up front under hard cornering, but then I put proper air pressure in the tires ( 36 front - 42 rear) and the bike has handled like a dream since. 

 

I think I'd really only be interested in longer ZX6F tubes, to be honest. I should be able to reuse my damper rods and springs, if I'm thinking correctly, and only have to lengthen the spring spacer by the same amount as the additional tube length. Is that correct? Or am I way off base here?

Edited by shinyribs

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shinyribs
On 2/12/2018 at 10:47 AM, twf said:

Shorter top out spring

Spacer replacing oil lock piece

Taller fork caps

Longer inner tubes

Does anyone set taller fork caps? I've shopped around and found nothing, but I do that alot. 

 

Also, any pictures of this oil lock piece floating around? I'm not sure what this piece is. Is it items 11 & 30 on this diagram?

 

https://www.partzilla.com/catalog/yamaha/motorcycle/2016/fz07-fz07gs/front-fork

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twf
46 minutes ago, shinyribs said:

Does anyone set taller fork caps? I've shopped around and found nothing, but I do that alot. 

 

Also, any pictures of this oil lock piece floating around? I'm not sure what this piece is. Is it items 11 & 30 on this diagram?

 

https://www.partzilla.com/catalog/yamaha/motorcycle/2016/fz07-fz07gs/front-fork

It is 11-30 in that diagram and looks same as this one http://www.triumphrat.net/air-cooled-twins-technical-talk/275090-fork-oil-lock-question.html

Don't think anybody sells taller caps but they can be made. It all depends how much longer you want them, that will decide best option. 

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