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1986-1987 GSX-R front end

Fjbj40

Fjbj40

Forum Mentor
I have looked around but have been not able to get a positve answer. Some say yes and some say no.

I am trying to find out if the GSX-R 750 and 1100 front forks are the same length for the 86-88 years?

I have been able to find plenty of 750 front ends but not much luck with the 1100 front ends (which some people recommend), up here on Canada's east coast.

thanks in advance,
Daryl
 
Thanks, so just under an inch? I can machine up an extension to screw into the tube and make them the same length.

There was some other good info there also.

Thanks
 
The 750 are shorter and the triple is not as strong. There is also a difference in offset. There is a nice complete 1100 front on eBay now. Iirc $100
The other thing to watch hour for is the axle. The 86-87 forks are 15mm and the 88 forks are 17mm. I'm running the 88 1100 forks on my gs1100ed
 
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Fjbj40 said:
Thanks, so just under an inch? I can machine up an extension to screw into the tube and make them the same length.

There was some other good info there also.

Thanks
Click to expand...
I tried extending the GSXR 1100 K ( 1989) fork tubes:mad:
Don't try!
It cost me a fortune to have the parts machined and then I discovered that stainless steel doesn't like to be screwed in a chromium plated tube....at least not twice!
Here's a view of the tubes:
http://www.thegsresources.com/_forum/showthread.php?t=187018
 
posplayr said:
The 750 are shorter and the triple is not as strong. There is also a difference in offset. There is a nice complete 1100 front on eBay now. Iirc $100
The other thing to watch hour for is the axle. The 86-87 forks are 25mm and the 88 forks are 17mm. I'm running the 88 1100 forks on my gs1100ed
Click to expand...
I believe you mean 15 mm and then 17 mm;)
 
posplayr said:
http://www.ebay.com/itm/1986-1988-S...326&pid=100033&prg=1011&rk=4&sd=380471108808&
Click to expand...
Be ware:rolleyes:
This ad says it's a GSXR 1100 fork.
It isn't:mad: It's a GSXR 750 fork albeit of the same period.
The giveaway is the fact that not only are the antidives not electrically controlled but the wheel spindle is held by only one bolt versus two on the 1100 version.
This means:
a) the fork is shorter by 25mm
b) the wheel spindle is most probably 15mm in diameter
c) the calipers and the disks need to be matched ( 300 mm for the 750 and 310 mm for the 1100)
Guess how I discovered all this:(
 
John Kat said:
Be ware:rolleyes:
This ad says it's a GSXR 1100 fork.
It isn't:mad: It's a GSXR 750 fork albeit of the same period.
The giveaway is the fact that not only are the antidives not electrically controlled but the wheel spindle is held by only one bolt versus two on the 1100 version.
This means:
a) the fork is shorter by 25mm
b) the wheel spindle is most probably 15mm in diameter
c) the calipers and the disks need to be matched ( 300 mm for the 750 and 310 mm for the 1100)
Guess how I discovered all this:(
Click to expand...

The triple clamp is off of a GSXR 86-88 1100 ; you can tell because the lower triple clamps have double bolts. The GSXR 750 only has a single bolt. The triples have different offsets so upper and lower do not mix between 750 and 1100.


As far as the axle pinch bolt there is only one on the 1100 and I assume for the 750 so that is not a clue (maybe you are thinking about the double pinch bolts on the lower triple?).

Yes it appears as if the anti-dives are off of an 750 so maybe someone swapped out the stations or maybe they just swapped out the anti dives. An email to the seller to confirm the free length would be in order.

Obviously these were polished and who knows what combination they came up with. :confused:
 
Fjbj40 said:
Looks cheap, but one of the forks requires replacement and do you see the freight quote he gave somebody, $236:confused:in the end, not a deal unless you could locally pick it up.

Thanks for the link though,
Cheers
Click to expand...

Yes, I can see that shipping to CA from Ca. would be pricey :o
 
posplayr said:
As far as the axle pinch bolt there is only one on the 1100 and I assume for the 750 so that is not a clue (maybe you are thinking about the double pinch bolts on the lower triple?).
Click to expand...
My apologies, you are right: the 1100 has only one pinch bolt for the wheel axle:o
I got confused by the GSXR 1100 K that has two...
Here are the pictures of my GSXR 1100 fork with a 300 mm GSXR 750 disk AND caliper
GSXR750disk001_zps2c7801f3.jpg

64e09a27.jpg
 
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John_Kat,
Are you running a single side brake? What 750 rotor are you running?

Here is my 83 GS1100ED with 1988 GSXR 1100 forks and 3 spoke 18x2.75" wheel with a Galfer wave rotor. I also put a GS1100ED anti dive on although it is not functional due to having modifications for Race tech cartridge emulators.
Jim
 
The seller confirmed some dimensions so I concluded that this is in fact a 1986-87 GSXR 1100 fork .

Thanks, if you measured the axle then it is a 15mm axle which makes this a 86-87 GSXR 1100 fork. The 88 GSXR 1100 fork is 17mm. The length of all three is 30.25 cm (excluding the fork top). Thanks for confirming those dimensions.
Click to expand...


!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
I JUST NOTICED THAT THE PO GROUND OFF ONE OF THE CALIPER MOUNTS TO RUN SINGLE SIDED BRAKES !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
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I noticed that when I first-looked at it, just imagine all the weight he saved by shaving off those mounting ears:rolleyes:

Ultimately this makes it worth $50 IMOP

posplayr said:
The seller confirmed some dimensions so I concluded that this is in fact a 1986-87 GSXR 1100 fork .




!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
I JUST NOTICED THAT THE PO GROUND OFF ONE OF THE CALIPER MOUNTS TO RUN SINGLE SIDED BRAKES !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Click to expand...
 
posplayr said:
John_Kat,
Are you running a single side brake? What 750 rotor are you running?

Here is my 83 GS1100ED with 1988 GSXR 1100 forks and 3 spoke 18x2.75" wheel with a Galfer wave rotor. I also put a GS1100ED anti dive on although it is not functional due to having modifications for Race tech cartridge emulators.
Jim
Click to expand...
Jim,
I'm currently running with a single disk as I was still in the evaluation phase.
When I looked around for GSXR 750 300 mm disks, there were only "premium" suppliers on the market.
The one I bought came from Metalgear. Very good but not cheap!
http://www.ebay.com/itm/251029211978?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
I would have bought 310 mm disks but my calipers could only accomodate the 300 mm version...
That's when I discovered that while the fork stanchions are the same between models the calipers aren't!
I'm going to buy the gold valves but what's the rating of your springs?
John
 
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