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GS 1000 engine in GSXR 1100 first gen frame?

John, keep in mind that the triple clamp offset is extremely critical in achieving a proper and excellent handling bike. It is not something you can just mix and match! I don't believe the gsxr1100k triples have enough offset to achieve what you are going for in a vintage race bike. 95-96mm trail is a good quick turning spec with a good deal of stability still, and using 18" wheels, you will need more offset in your triples most certainly to get this kind of precise and quick handling. 17" wheels and the gsxr1100k triples would give this, but 18's generate much more trail. Before any final triple selection, measure the fully loaded bike's actual head tube rake and front tire diameter, & do some calculations. There are several places that make custom billet triples, as this is almost always the easiest way out to get very precise handling without weeks of researching triple clamp specifications.

The only way I'd think you will get really good quick steering with the 18" and 1100k triples would be if you had increased the caster to around 24 degrees rake, thus reducing trail substantially.
 
Chuck78 said:
John, keep in mind that the triple clamp offset is extremely critical in achieving a proper and excellent handling bike. It is not something you can just mix and match! I don't believe the gsxr1100k triples have enough offset to achieve what you are going for in a vintage race bike. 95-96mm trail is a good quick turning spec with a good deal of stability still, and using 18" wheels, you will need more offset in your triples most certainly to get this kind of precise and quick handling. 17" wheels and the gsxr1100k triples would give this, but 18's generate much more trail. Before any final triple selection, measure the fully loaded bike's actual head tube rake and front tire diameter, & do some calculations. There are several places that make custom billet triples, as this is almost always the easiest way out to get very precise handling without weeks of researching triple clamp specifications.

The only way I'd think you will get really good quick steering with the 18" and 1100k triples would be if you had increased the caster to around 24 degrees rake, thus reducing trail substantially.
Click to expand...
Chuck, I'm well aware of these facts that were highlighted here: http://www.thegsresources.com/_foru...7-Basic-maths-for-fork-conversions&highlight=
I just bought a complete RSU R6 front fork and it looks very promising.
First the spacing between the stanchions at 205 mm is identical to the GSXR 2nd gen fork I currently have.
Second the fork length at 755 mm is 15 mm longer than the GSXR counterpart.
This not important for this project but will be a godsend for a GS 1000 frame.
Third the triple's offset at roughly 40 mm is 5 mm longer than the GSXR's.
Worst case, I could use the R6 triples in my project to quicken the steering further.
The unknown so far is will a GSXR wheel fit the R6 fork?
The spindle diameter appears to be 22 mm!
 
The purists are going to yell but I have decided to equip the bike with a pair of lenticular lenses.
The main reason beeing that it should not distract too much from the racing look of the fairing as the lens itself is only 50 mm in diameter.
Here's what they look like:

DSCF6862_zpsbcdcfabj.jpg
 
Those must look weird on any bike.
Me thinks they might work with the frog face Katana fairing. :rolleyes:
 
The lenticular lenses are now in place.
The subframe supporting the lenses is rubber mounted to reduce the vibrations in the headlights.
On the pictures the second lens is missing as the vendor had shipped two high beams...
The holes in the fairing will come later when I'm absolutely sure everything lines up correctly.
Currently the fairing is held below the lenses up front, to the frame in front of the cylinder head and behind the cylinder head.
The most difficult remains to be done: getting a support on both sides of the windscreen.
Normally this support should also carry the rear view mirrors...

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"I just bought a complete RSU R6 front fork and it looks very promising."

Kinda twiddling my thumbs waiting to see how this turns out. No pressure.
 
GSYOSHI said:
"I just bought a complete RSU R6 front fork and it looks very promising."

Kinda twiddling my thumbs waiting to see how this turns out. No pressure.
Click to expand...
How strange, I just bought one myself:cool:
It will most probably be for version 2.0.
The only issue is that it will be difficult to fit GSXR 18" wheels ...
The good news is that the stanchions will slide right into the GSXR 1100 K triples!
 
At long last, I got to work on the bike this week.
The upper fairing stay and the rear view mirror support is now in place.
Next will be fitting the front lights and drilling the holes in the fairing...

DSCF6980_zpsywg2pprb.jpg


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Any particular reason you went with the fiberglass fairings rather than the stock plastics? Just curious. I'm guessing weight or easier to fit the fiberglass parts.
 
I like seeing your bracket job, looks good.
I'm looking at a Ducati 900SS fairing on my 1100G, but I'll have to make me own brackets too.
Bummer is, I lose my favorite mirrors. Just for that reason, I'm stuck between the Ducati half fairing and a Cooley bucket fairing.
 
ShadowFocus603 said:
Any particular reason you went with the fiberglass fairings rather than the stock plastics? Just curious. I'm guessing weight or easier to fit the fiberglass parts.
Click to expand...
The reason is simple: I didn't want the bike to look like a GSXR.
The idea was to build a copy of the XR 41 racing bike of the 80's.
The XR 41 with it's aluminum frame was the basis of the future GSXR 750 that came out in 1985.
 
Buffalo Bill said:
I like seeing your bracket job, looks good.
I'm looking at a Ducati 900SS fairing on my 1100G, but I'll have to make me own brackets too.
Bummer is, I lose my favorite mirrors. Just for that reason, I'm stuck between the Ducati half fairing and a Cooley bucket fairing.
Click to expand...
I don't know if the Ducati half fairing is attached to the frame or not but be aware that the Cooley fairing detracts from the front end feel of the bike.
 
Thanks for the Cooley info, there seems to be several issues inherent to quarter fairings. The factories dropped them inside 3 years, in favor of frame mounted fairings.
I think I read Wes Cooley did not the Cooley fairing on his race bike, said to give it a wobble at high speed.
 
First ride with my XR 41 Replica:cool:
I went out for my very first ride today.
It should have been yesterday but the GSXR 1100 K wiring harness has a fail safe item that shuts the engine off if yo take it off the side stand.
As I don't have a switch on the side stand and as the engine started easily, I thought I could have driven off with no issue.
In fact the engine is allowed to start as long as the gears are in neutral.
To get it to work quickly, I just shorted the neutral indicator to ground.
Now to the ride!
The very pleasant surprise was that the bike goes as straight as an arrow despite the fact the frame was not assembled on a jig.
This means that if one starts with a good frame the precision extension rails will keep the geometry intact.
The ride can be qualified as firm with the GSXR suspension components.
The platform seems very stable due to the trail induced by the front 18" wheel.
The position on the bike is sporty but not as extreme as an 1100 Katana.
Still many details to sort out but the XR 41 Replica is well born:)

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