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Discussion Starter · #1 ·
1985 vf1100s, wanting to swap forks, trees wheels and brake system, basicly the whole front end for something more modern. One mandatory requirement is that they are USD.

Why? Even with new stainless lines, rebuilt calipers, hayabusa master cyl./ reservoir that I rebuilt ( plunger rubbers) with fresh fluid and properly bled, the lever needs a good pumping to get maximum bite, to which i credit the floating calipers and their needy sliders. Which Ive buffed lubed and installed new seal rubbers.

I'll just summarize at this point, I want a 17 front wheel rather than the stock 18, better damping performance, no more TRAC, and peace of mind that I no longer ride on considerably skinny for the bikes weight 41mm forks.

I think adventure touring forks would fit perfectly for the bike's already irregular geometries.

Ideally a simple bolt on and go swap out, but if I can at least find an abundant, commonly known set of USD ADV forks of proper length, I think a good option from there would also be having a custom triple assembly made. I will post some measurements in a bit.
I would really appreciate any help you guys can give.
 

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Is my bike ok?
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Not to be a dick, but it sounds like your MC is undersized if it takes a long lever stroke to pinch the pads. Just because it came off a hayabusa that doesn't mean it'll brake like one. If you've got a Hayabusa MC powering stock calipers I'm pretty sure it's undersized. Those old Honda's used some large diameter mc pistons. In your defense, those bikes had barely adequate brakes to begin with, so there isn't much margin for error when trying different MC's anyway.

Anyway, regarding front end swap, check out other Honda's. They rarely change shit on their bikes. Makes for some very simple fork swaps. You can nearly bolt a CBR F3 front end directly on to a '69 CB750. All the bearings match, there's just a slight difference in stem length. Just an idea.

USD vs conventional forks won't give you any better braking performance either. And those bikes suffer from very poor ground clearance when running most any modern USD/ 17" wheel setup. Trust me. My '81 CB750F is on F3 forks and 17's and my pipes bang the road easily. I understand that Yamaha uses some long fork legs, so you might want to shop on that direction.

Good luck dude. And thumbsup for showing that old Honda some love. :knucks:
 

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The calipers have two 32mm pistons each so the usual 5/8" master cylinder would be close enough. But if the caliper bodies are worn such that the pins aren't working right (i.e. Only in one axis) or if the bodies are worn due to scraping corrosion out such that the seals aren't a good fit on the Pistons (which may be rusty) then it could well be hopeless to rescue or refurb.

Longer usd forks... KTM might have suitable offerings and buell had the Ulysses but I'm not sure about cheap. How about the 650 versys? Appreciate you want the look but usd isn't the be all and end all. Can also look out of place on older bikes. Maybe consider some actual mx forks and put stiffer springs in?

Honda and Showa also have a neat trick. Lots of 41mm damper rod forks have cross compatible bottoms. If you mostly want to upgrade the brakes you may (not definitely!) find that vtr1000f fork lowers fit your forks and allow you to use calipers from a 929/954 with just a little dremel work for clearance. Once you have calipers with modern size piston around 30/34 any master cylinder you want will work such as a recent radial unit off a fireblade.
 

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Discussion Starter · #4 ·
Thanks so far you two.
I have considered the versys 650, thinking it would be an abundant source, that or the nxc700 whatever things honda has now, or in the v strom line, etc.

considering klr too.

I've always wondered if it was undersized... you kinda mirrored my thoughts exactly there. I think its okay in truth, I just dont like how floating calipers feel vs floating discs.

The calipers have literally brand new pistons in them, new seals, etc. Optimal condition for the model then some.

I also im pursuing a modern front end for the standard 120/70 - 17 front tire.

Oh, and this is my second V65 sabre. I have all the big name upgrades / mods, and some home brewed mods.
I am truly in love with the VF1100S. Stock collector with no mufflers, that's a sound no other machine will ever have. And it still bounces the front up when upshifted into fourth.
 

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Have a look into the fork sliders swap idea. Won't improve your suspension granted, but it will give you a modern wheel/tyre, floating discs, and fixed calipers. For cheap.

Cost you $40 to find out if it works. I do know those lowers fit a CB-1, which also accepts lowers from an nc29,30,23, 600f2,3 and so on. Basically any 41mm Showa fork seems to be cross compatible.

https://www.ebay.co.uk/ulk/itm/281866460579

You can then use virtually any wheel too. F3, superhawk, whatever comes up cheaper and suits your back wheel better. A kawi wheel might look right, just needs one with 296mm discs and similar spacing etc. And same for cross compatibility of Honda 296mm discs. Calipers of choice are gold Nissin from a 929/954, just needs a little grinder action. Nothing a 'fighterer should be scared of.
 
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