Sticky Forking

[simi_ed]

No further away than the shelf in my garage.

[simi_ed]

My thoughts also, for me, not you Frank 

[Burns]

Just go read the Rittner post dude...  I gave you the f'ing link!  Here's the rundown:

1. the FJ stem needs to be fattened at the bottom with welded on material, then machined and pressed into the YZF750 lower tree.
2. the upper is best replaced with the LDL riser setup, bolt on with variety of bars you can use.  I use FZ1 bars to get the threaded bar ends and the fit to the '92 fairing is perfect.
3. the forks will need a spring change for the FJ's weight and the internals on mine were breathed on by GP suspension to move their adjustments into the relevant range for the FJ.
4. Blue spots and better rotors might be an upgrade, but the 6 piston YZF750 brakes likely just need pads and you're on the road. 

This isn't a bad mod and the speedo drive still works.  Follow the link to UK site and you'll get the rundown in much more
detail.

Frank

I read that Frank and was struck by the admonition that only an aircraft quality welder would be qualified to make the stem modifications.

I still do not see why a bearing with the proper i.d. would not be the way to go.

[Burns]

The song goes "don't advertise your man" . Looks like this thread has probably injected enough interest in the ebay item to preclude my involvement in the bidding.

BTW, the bearing swap still looks like the way to go to me.

[Flynt]

I still do not see why a bearing with the proper i.d. would not be the way to go.

I don't think that's why you build the stem up...  the primary reason is to get an interference fit with the lower triple.  At that point you just carve out the right diameter to run the stock FJ bearings.  Makes life easier to use stock consumables on your mods.

Frank

[Flynt]

the upper is best replaced with the LDL riser setup, bolt on with variety of bars you can use. 

Riser setup for the YZF750R...  asked to clarify.

Frank

[Burns]

I still do not see why a bearing with the proper i.d. would not be the way to go.

I don't think that's why you build the stem up...  the primary reason is to get an interference fit with the lower triple.  At that point you just carve out the right diameter to run the stock FJ bearings.  Makes life easier to use stock consumables on your mods.

Frank

Sorry I did not make my observation more understandable.

I'm suggesting that there may be a way to either skip all of the machining or at least the "precision welding" part.

The question turns (no pun intended) on the length of the YZF stem.

If it is too short, the options are (1) the one taken in the thread- i.e. "precision welding" to fit the FJ stem to the YZF lower tree; or (2) turn the YZF stem diameter down to that of the FJ stem diameter. In both cases the stock FJ bearings would be used.

If the length is the same, or close enough, you can use the unmolested YZF tree/stem - no machining at all -  by simply changing the bearings so they match up with the stem and the FJ neck.  This assumes that the bearings are available of course.

If it is too long, you'd need to cut it down and maybe cut some threads - no "precision" called for beyond basic machine shop competence - then use the bearings described above to match it to the neck.


I do not understand your comment "just carve out the right diameter to run the stock FJ bearings."  If I understand you correctly the mod you advocate uses the FJ stem so those tolerances are correct as is.

There are many ways to skin a cat, though the market for cat pelts may be iffy.

[Flynt]

You're right...  we were talking past each other.  The YZF stem is too short for the FJ head tube, so you fit the FJ stem to the YZF lower.  I thought that was made clear in Mark's post, but maybe not. 

"Carve Out" = When you do the build for the stem fit, the bearing seat will be impacted and you'll want to make a new shoulder and seat for it.

Frank

[Burns]

That clears it all up.  Thanks, Frank.
The General Rule, which I keep rediscovering, is that when I see something obvious that it appears others have overlooked they probably know something that I don't.

[Flynt]

they probably know something that I don't...

my experience too...  usually "talking past each other" is easily resolved by a phone call.  That's a little tougher on a forum, but a reset when you've lost the bubble (submarine speak, sorry) works wonders.

I still recommend the mod (although you should use a '91+ platform to get the stiffer frame).

Frank

[Burns]

I'm having no luck locating a slider. I see no safety issues with the repair so I'm going to put it all back together and ride while I keep a look-out.  If y'all come across an 89-90 left (from the saddle) lower leg I'd be much obliged for a heads up.

[Burns]

Still no luck finding a good FJ leg.

There's a Fireblade front end (completed except the wheel) on ebay
http://www.ebay.com/itm/301221605681?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

What is the collective wisdom re: that piece of kit for an FJ transplant?

[Arnie]

Still no luck finding a good FJ leg.

There's a Fireblade front end (completed except the wheel) on ebay
http://www.ebay.com/itm/301221605681?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

What is the collective wisdom re: that piece of kit for an FJ transplant?

Wisdom  
Anyhow, things you'll need to consider include:
Overall length compared to the FJ forks
Stem length and/or diameter for steering bearings
Brake caliper fitment
You'll need to re-spring and adjust damping as this is from a bike over 100lbs lighter
Speedo

Probably more to consider, but that's all I can think of for now.

[simi_ed]

Still no luck finding a good FJ leg.

There's a Fireblade front end (completed except the wheel) on ebay
http://www.ebay.com/itm/301221605681?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

What is the collective wisdom re: that piece of kit for an FJ transplant?

Spend $175 on a project that ***may*** work?  How about $250 on a sure thing?


http://www.ebay.com/itm/YAMAHA-89-90-FJ-1200-FJ1200-FRONT-FORKS-FORK-ASSEMBLY-SUSPENSION-TRIPLE-TREE-OEM-/231233779294?pt=Motorcycles_Parts_Accessories&hash=item35d69b765e&vxp=mtr

[FJ1100mjk]

Still no luck finding a good FJ leg.

Maybe one of these boneyards has one, or can find you one. http://motorcycleviews.com/maintain/boneyards.htm Not all have websites, so you may have to ring them up.

Patience is the key. You'll find one for a good price.