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Fork Bracing

Started by FJ4ever, April 28, 2017, 09:40:31 AM

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FJ4ever

An inexpensive but effective way to stiffen forks on any FJ is to simply get hold of another stock brace and
install it directly on top of the existing one. I installed slightly longer Allen head machine screws as well.
Works a treat.
"The reasonable man adapts himself to the world. The unreasonable one persists in trying to adapt the world to himself. Therefore all progress in the world depends on the  unreasonable man".  - George Bernard Shaw

FJmonkey

Look closely at the holes in both braces. If one of them is already stretched out then the other will likely have no more benefit. The clamping force of the screws holding it on is no match for the forces of fork flex. The OEM aluminum brace is too soft to be any kind of a brace. http://www.fjowners.com/index.php?topic=14734.msg149000#msg149000
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

Pat Conlon

Yep, I agree with Mark. The FJ has a fender strap, not a fork brace. Don't confuse the two.
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

FJ4ever

The assumption of course is that the owner first satisfies himself as to the condition of the existing brace/strap. Doubling its thickness does make a difference.
"The reasonable man adapts himself to the world. The unreasonable one persists in trying to adapt the world to himself. Therefore all progress in the world depends on the  unreasonable man".  - George Bernard Shaw

Mike Ramos

Interesting:

So, double the strength of the fender strap, what about the fasteners?  Are they expected to handle the extra load?   

camo

So I will profess my ignorance of the use on a fork brace on the FJ. Dont get me wrong I know what they do and have used them on old track bikes I have owned  where it is useful and makes a difference. But on the FJ what real world benefit are people expecting? I treat my FJ like an R1 in the bends and have upgraded every single suspension component/ rear wheel and run Pilot Power tyres to suit this riding style, but short of transferring the flex to my steering head bearings and hence wearing them out prematurely what am I missing by not having one on my FJ? (Please dont tell me they stiffen the forks yadda yadda yadda.... I know that, Im interested in the real world performance/feel/ difference you notice.

Cheers All

aviationfred

Quote from: camo on April 28, 2017, 08:53:58 PM
So I will profess my ignorance of the use on a fork brace on the FJ. Dont get me wrong I know what they do and have used them on old track bikes I have owned  where it is useful and makes a difference. But on the FJ what real world benefit are people expecting? I treat my FJ like an R1 in the bends and have upgraded every single suspension component/ rear wheel and run Pilot Power tyres to suit this riding style, but short of transferring the flex to my steering head bearings and hence wearing them out prematurely what am I missing by not having one on my FJ? (Please dont tell me they stiffen the forks yadda yadda yadda.... I know that, Im interested in the real world performance/feel/ difference you notice.

Cheers All


If you really want to stiffen up the front end go with a set of USD forks.


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

FJmonkey

Quote from: camo on April 28, 2017, 08:53:58 PM
what am I missing by not having one on my FJ?
Less broken fender tabs, less lateral load on the fork bushings reducing time between fork rebuilds. And they cost less than Fred's USD forks, but not as sexy....
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

camo

haha thanks monkey.....nearly did the USD conversion on my FJ and i still love the look (they seem to be called the chick magnet conversion on this forum)......unfortunately I would need more than that to pull chicks..... :wacko2:

simi_ed

Quote from: camo on April 28, 2017, 08:53:58 PM
So I will profess my ignorance of the use on a fork brace on the FJ. Dont get me wrong I know what they do and have used them on old track bikes I have owned  where it is useful and makes a difference. But on the FJ what real world benefit are people expecting? I treat my FJ like an R1 in the bends and have upgraded every single suspension component/ rear wheel and run Pilot Power tyres to suit this riding style, but short of transferring the flex to my steering head bearings and hence wearing them out prematurely what am I missing by not having one on my FJ? (Please dont tell me they stiffen the forks yadda yadda yadda.... I know that, Im interested in the real world performance/feel/ difference you notice.

Cheers All
I'm running a YZF-600 front end, so this isn't an apples-apples comparison, but I sure did notice a huge improvement in feel/feedback from wheel to bars, and improved responsiveness from the same. As a few others have also pointed out, your front fender will last a lot longer, due to the lack of flex from the forks. 
YMMV.
-- RKBA Regards,

Ed
===
Ed Thiele 
Simi Valley, CA -- I no longer have SoCal manners.
'89 FJ12C (Theft deterrent Silver/White)


- All that is necessary for the forces of evil to win in the world is for
enough good men to do nothing.

- Edmund Burke

Mike Ramos

Hmmm,

I just spent a considerable amount of money having both rims straightened from every day use. 

I would suspect the rims are a somewhat tougher than the fender strap and its' fasteners.  If the rims are taking such a beating, without question the suspension components are as well. 

However, the steering head bearings remain perfect, in fact they are a non issue. 

Re-read the results of Mr. Conlon's test.  I was not involved with it but Pat is a very competent and capable rider.  Also, others have similar experiences.

Of the several types of fork braces used, all are more substantial than the fender strap.

Just a few thoughts...






FJ4ever

Quote from: FJ4ever on April 28, 2017, 07:34:20 PM
The assumption of course is that the owner first satisfies himself as to the condition of the existing brace/strap. Doubling its thickness does make a difference.

Ok, able to continue now after laying her down the other day to avoid a mental midget turning into me. The sound of aluminum and plastic grinding on asphalt is, well, nauseating.

To clarify, doubling the strap/bracket/stiffener, call it what you want, in my case was intended to try to eliminate annoying repairs to cracking fender brackets and tabs which I figure could only be caused by fork flex. Since doing it a year ago, zero fender issues, which of course means there is indeed stiffening happening. Handling-wise there is a very slight improvement in sharpness and in behaviour on grooved surfaces but the fender issue is the main benefit for me. Now where is that Polysporin.
"The reasonable man adapts himself to the world. The unreasonable one persists in trying to adapt the world to himself. Therefore all progress in the world depends on the  unreasonable man".  - George Bernard Shaw

FJmonkey

Very sorry to hear of your un-planned dismount. You posted so you at least lived. The rest can be healed or repaired. What needs fixing?
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

FJ4ever

Thanks for commiserations. Was only going about 35, so relatively minor but nonetheless very annoying
damage to the right side. Scrapes to rear turn signal, end of muffler, edge of main fairing, side of chin spoiler, bar end, brake lever and mirror. Fairing protector ground to nothing, oil pump cover unsalvageable. Replaced the twisted brake pedal already and will do the CBR mirror swap. Happily there are a few breakers in the area where most bits are likely findable before casting the net wider.
"The reasonable man adapts himself to the world. The unreasonable one persists in trying to adapt the world to himself. Therefore all progress in the world depends on the  unreasonable man".  - George Bernard Shaw

FJ_Hooligan

Just curious, do you have aftermarket brake lines?
DavidR.