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Started by Dieselman7.3, August 10, 2019, 04:41:47 AM

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giantkiller

Here's a couple of pics of my bikes with inverted.
86 fj1350r
86 fj1380t turbo drag toy (soon)
87 fj1200 865 miles crashed for parts
89 fj1200 touring 2up
87 fzr1000 crashed
87 fzr750r Human Race teams world endurance champion
93 fzr600 Vance n hines ltd for sale
Custom chopper I built
Mini chopper I built for my daughter just like the big 1

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
I'm not the fastest FJ rider, I am 'half-fast', the fastest slow guy....

Current
2008 VFR800 RC46 Vtec
1996 VFR750 RC36/2
1990 FJ1300 (1297cc) Casper
1990 VFR750 RC36/1 Minnie
1989 FJ1200 Lazarus, the Streetfighter Project
1985 VF500F RC31 Interceptor

Pat Conlon

Quote from: Dieselman7.3 on August 11, 2019, 06:11:24 AM
Quote from: Pat Conlon on August 10, 2019, 04:02:52 PM
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.
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

Dieselman7.3

Okay thanks for the input just trying to think of what's  going to be the easiest but maintain safe functionality
Current:
85 fj1100
89 fj1200 - was for parts now a new project
16 Versys 650 - for off payment riding
Past:
86 fj1200
05 ex500
78 Ltd750

Pat Conlon

The '91-93 FZR1000 front end is the easiest.
The GSXR front end is the best.
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

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.
Dean

'89 FJ 1200 3CV - owned from new.
'89 FJ 1200 3CV - no engine, tank, seat....parts bike for the future.
'88 FJ 1200 3CV - complete runner 2024 resto project
'88 FJ 1200 3CV - became a race bike, no longer with us.
'86 FJ 1200 1TX - sold to my boss to finance the '89 3CV I still own.

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)
Current:
85 fj1100
89 fj1200 - was for parts now a new project
16 Versys 650 - for off payment riding
Past:
86 fj1200
05 ex500
78 Ltd750

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
Never Slow Down, Never Grow Old.

Current Stable:                                                     
FJ1100                                              
FJ1200 (4)
1999 Yamaha WR400 (street-legal)
2015 Super Tenere
2002 Honda Goldwing

Dieselman7.3

Quote from: CutterBill on August 12, 2019, 06:25:03 PM
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?
Current:
85 fj1100
89 fj1200 - was for parts now a new project
16 Versys 650 - for off payment riding
Past:
86 fj1200
05 ex500
78 Ltd750

FJmonkey

I think Bill was having some fun play on words. When traditional forks are upside down, the bike is upside down.
The glass is not half full, it was engineered with a 2X safety factor.

'86 Ambulance - Bent frame, cracked case, due for an overhaul
'89 Stormy Blue - Suits my Dark Side

CutterBill

Quote from: FJmonkey on August 12, 2019, 08:01:35 PMI 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
Never Slow Down, Never Grow Old.

Current Stable:                                                     
FJ1100                                              
FJ1200 (4)
1999 Yamaha WR400 (street-legal)
2015 Super Tenere
2002 Honda Goldwing

Dieselman7.3

Quote from: CutterBill on August 12, 2019, 09:47:35 PM
Quote from: FJmonkey on August 12, 2019, 08:01:35 PMI 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   :wacko1:
Current:
85 fj1100
89 fj1200 - was for parts now a new project
16 Versys 650 - for off payment riding
Past:
86 fj1200
05 ex500
78 Ltd750

Pat Conlon

Hey Bill, are you coming up to Oakdale for Randy's shindig? 
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

Flynt

Quote from: Pat Conlon on August 12, 2019, 10:05:19 AM
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
There's plenty of time for sleep in the grave...

Pat Conlon

Yep, love my YZF750 forks.

Thanks again Frank for the tip on getting them reworked by GT Suspension. A big difference.
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3