GS 1000 engine in GSXR 1100 first gen frame?

[John Kat]

Looks good to me also. That first view makes me wonder how the bike would look naked or semi naked, as it seat / tail and perhaps a bikini fairing. I love the aluminum frame and exposed engine.

Thanks!
I will definitely not use a full fairing on the bike.
Currently I'm investigating using the upper part of the CBR 600 model 98-99 fairing.
Poly 26 in France sells a replica ( model # 530) that can be used with two round headlights.

http://www.poly26.com/carenage-moto-tuning-honda-600-cbr-1988-1990_2-5.html

It should have enough of the period look while beeing able to accomodate clip-ons above the triple tree.
Will it be wide enough is the question?

[John Kat]

Looks great! Is the header a 4 into 1 or 4 into 2 into 1?

Either way ground clearance looks acceptable.

The header is the OEM header used on the GSXR 750 from 1991.
It's a 4 into 1 model with a twist as there is a horizontal plate at the end of the header so that in practice cylinders 1 and 3 get to mix just like 2 and 4 slightly before getting all together.
So it looks like a 4 into 1 from the outside but internally it's a 4 into 2 into 1 at least for a few centimeters.
I forgot if this approach boosts power versus torque as I know some bikes mix the exhaust gasses between the even and the odd cylinders?

[RedLiner1100]

The bike is looking killer!

[John Kat]

The bike is looking killer!

Thanks!
Progress is slow as I moved houses in the meantime.
In any case I still haven't received the seat from Airtech...

[John Kat]

Finally some progress...
The fins on the bottom engine cover got trimmed further to clear the headers but will require a little further grinding!
The front left engine bracket is now fully functional.
The headers got painted.
The exhaust midpipe got lengthened.
I had bought a small metal plate to mount the CDI to the battery box but I realized that stainless steel might be nice to look at but almost impossible to drill through!
Next step secure the muffler in place.

Here are the pictures:

[posplayr]

The pipe is hanging nice

[John Kat]

The seat came in today but needless to say it will require some work to fit it on the bike.
On one of the pictures, you will see the seat, the GSXR 1100 tank and a GS 1000 S fairing.
In the end, I wonder if this fairing would not be the most appropriate for the bike?
It would be attached to the frame instead of the front fork.
Given that the XR 41 was a transition model between the the GS 1000 ( for the engine) and the GSXR 750 for the frame it would add to the transition idea?
What do you think?

[Fjbj40]

I think it would add to the transition concept, however, for me the "S" fairing is not correct, as it sits.

I think it is not long enough on the bottom and not wide enough to encapsulate the front of the bike. I feel it needs to be larger but not go all the way down as to hide the engine, not sure if that makes sense?

cheers,
Daryl

Keep going though, this a very cool venture!

[John Kat]

I think it would add to the transition concept, however, for me the "S" fairing is not correct, as it sits.

I think it is not long enough on the bottom and not wide enough to encapsulate the front of the bike. I feel it needs to be larger but not go all the way down as to hide the engine, not sure if that makes sense?

cheers,
Daryl

Keep going though, this a very cool venture!

You are most probably right.
I have also looked at the "Moto Martin" fairing but it requires having the clip-ons below the triple tree.
It would have been fine when I was a little younger...

[Fjbj40]

You are most probably right.
I have also looked at the "Moto Martin" fairing but it requires having the clip-ons below the triple tree.
It would have been fine when I was a little younger...

LOL, how true about the younger.....but then again we usually did not have the disposable cash for this type of fun!

[John Kat]

The complete exhaust is now in place.
It's really tight under the engine despite shortening the fins quite a bit.
Good enough to get the engine started.
Next challenge will be to secure the seat from Airtech...
I've never done this before and I'm not quite sure how to go about doing so?
Here's what it looks like so far:




The trick I used to secure the exhaust header

A mock up of the seat support

[posplayr]

That is the problem with the Airtech stuff; they seem to provide little more than a smooth outer skin. Are you going to fabricate that mount and bolt it on? Seems like you would still want a reinforced area to put a bolt through.

[GregT]

A favourite way of mine to mount fiberglass seats is to cut out a marine ply base piece and attatch it under the glass seat. Usually around 1/2in thick is adequate. Four bolts or screws with large flat washers under the heads holds the ply on. To hold to the frame, i usually do captive bolts through the ply. Heads recessed into the ply under the glass and nuts below the ply. This means that you can undo the seat mounts without having to remove any seat padding, and the fasteners are hidden too.

[John Kat]

A favourite way of mine to mount fiberglass seats is to cut out a marine ply base piece and attatch it under the glass seat. Usually around 1/2in thick is adequate. Four bolts or screws with large flat washers under the heads holds the ply on. To hold to the frame, i usually do captive bolts through the ply. Heads recessed into the ply under the glass and nuts below the ply. This means that you can undo the seat mounts without having to remove any seat padding, and the fasteners are hidden too.

Excellent idea!
Thanks Greg

[John Kat]

The seat attachment has moved forward!
Given that the seat base is much higher than the frame rails, I decided to build a kind of pyramid to get to the required height.
The lower layer comes from my spare frame and is attached through 4 silentblocs not so much to quell any vibration but to clear the battery box fittings.
This layer will also accomodate the Regulator Rectifier on a welded aluminum plate as a base.
The next two layers ( in wood on the picture but later in aluminum) will be solidly attached to the seat base.
Four vertical straps will be welded on the aluminum frame just below the transversal wood beams in order to get an horizontal bolt through the top of them to secure the transversal wood beams.
The bolts will be accessed through small holes in the side of the seat.
This should allow an easy removal of the seat for maintenance purposes.
It's getting frighteningly close to getting the bike to run...