Forks

[giantkiller]

Here's a couple of pics of my bikes with inverted.

[aviationfred]

I did the write up for the GSX-R1000 forks, but Dan, (giantkiller) is who perfected the swap and I got a lot of guidance directly from Dan. Here is a photo that I took of Dan's incredible 1986. Plus the 2 that I have done.

Fred

[Pat Conlon]

R-1 you want, R-1 you get...http://www.fjowners.com/index.php?topic=3148.0

Can the bottom mount of the fjs triple tree be safely bored out to take the forks of 50mm?

No. Going from the FJ's oem 41mm diameter to a 50mm diameter, it's not even close.
You will need a different lower triple. Dan's (giantkiller) above solution addresses the upper triple.

[Dieselman7.3]

Okay thanks for the input just trying to think of what's  going to be the easiest but maintain safe functionality

[Pat Conlon]

The '91-93 FZR1000 front end is the easiest.
The GSXR front end is the best.

[Millietant]

I'm with Pat on this 100%. The FZR coversion was really simple (even making the bracket for the lock stops only took 15 minutes) and great value, and I like that fact that it's an "all Yamaha" version......BUT........

If cost and difficulty/hassle/"originality" weren't an issue, I'd go for the GSXR conversion every time, as I'm sure the end result is much better handling and ride quality.

My priorities were better (but not ultimate) handling, steering, ride quality, braking and keeping it looking like the "factory-finish" FJ that Yamaha should have built.

[Dieselman7.3]

My thoughts were to keep it yamaha but if the the gsxr swap is better might go that way. I guess price and availablity on parts will be my deciding factor. I'm not planning on doing it until winter so I have time to source everything before I tear down the bike (want to ride it until snow falls)

[CutterBill]

I've had inverted forks on my FJ12 before. Didn't like it.

Mind you, they were still attached to the bike at the time...   
Bill

[Dieselman7.3]

I've had inverted forks on my FJ12 before. Didn't like it.

Mind you, they were still attached to the bike at the time...   
Bill

What was it you didn't like?

[FJmonkey]

I think Bill was having some fun play on words. When traditional forks are upside down, the bike is upside down.

[CutterBill]

I think Bill was having some fun play on words. When traditional forks are upside down, the bike is upside down.

Yep. That was not a fun day. Thanks to AviationFred for helping me get that heavy lump right-side up...
Bill

[Dieselman7.3]

I think Bill was having some fun play on words. When traditional forks are upside down, the bike is upside down.

Yep. That was not a fun day. Thanks to AviationFred for helping me get that heavy lump right-side up...
Bill

Right over my head   

[Pat Conlon]

Hey Bill, are you coming up to Oakdale for Randy's shindig? 

[Flynt]

The '91-93 FZR1000 front end is the easiest.
The GSXR front end is the best.

YZF750 front end looks OEM, is very adjustable, and gives you enough length on the tubes to actually fit the FJ...  I'm sure spacers and extensions are 100% safe and all, but they definitely don't look OEM.  The YZF750 USD mod is well documented, but it does require some work on the lower triple (putting FJ tube in YZF lower).  This is not the easiest route...  but it is what Pat runs ;-)... 

Frank

[Pat Conlon]

Yep, love my YZF750 forks.

Thanks again Frank for the tip on getting them reworked by GT Suspension. A big difference.