92 GSXR 1127 engine into 750F Katana, [sick]

[Buffalo Bill]

Gonna have to use a 3/4" threaded rod for the axle, can't find a 20m x 350mm

I'm happy with the results, this is gonna work.
I pushed the axle all the way forward in the slots and I still got 18mm clearance on each side of the 190/50 tire. Next I'll weld on a brace somewhat like the GSXR.

[posplayr]

Cute trick, I assume you will for sure NOT be using the rear wheel adjuster marks any more.

[Buffalo Bill]

Wadda ya talkin abou? (Do I sound like Barry Sheene?)
I never depended on those, they're only an aid, a mark to note incremental adjustments.

[Buffalo Bill]

Put it in there

Ok, have the chain adjusters at midpoint, and this tire is 192mm wide, I'll be using a 180/55. I haven't got a 6 bolt sprocket, but ordered a new set today. Looks like the chain just touches the tire, the caliper looks right on, the brake arm is almost good, the forward mount just needs to be moved outward 10mm maybe.

[posplayr]

Wadda ya talkin abou? (Do I sound like Barry Sheene?)
I never depended on those, they're only an aid, a mark to note incremental adjustments.

For those that it did not occur to, since there is no jig in sight to insure alignment of the
1.) adjustment mark frame to the
2.) swingarm bolt frame

then and assumptions about their relative alignment can be thrown out the window.
Even though it is common knowledge to not base wheel alignment on adjustment marks (due to factory tolerance errors), whatever it was it is certainly worse now.

In theory swing arm adjustment marks are properly spaced to insure the back wheel axle is aligned with the swing arm bolt; the relative orientation of the bolt and marks are referred to here as relative orientation of alignment frames.

Not saying it is bad, just need to be aware it would probably be way out now requiring wheel alignments.


(not to nit pick, but I think I would have hit that side wall with some acetone or mineral spirits before the photo op .

Anyway, this is turning into a nice looking street legal track bike that you can actually ride v.s. the cramped quarters of a Gixxer

[Buffalo Bill]

For me this is real cramped.
It's amazing how tiring it is to ride just 10 laps. You have to move your butt over so your crotch is on the seat edge before a corner, then as you accelerate away from the corner you have to push against .6 to 1 G move body forward and move your butt to the other side for the next corner.
The 1st 5 laps I'm ok, then I'm getting tired, the last 3 laps I'm getting weaker on every corner. Later in the day I have to quit after the 7th lap.
Imagine doing squats with a 50lb back pack, how long can you keep it up?

[posplayr]

For me this is real cramped.
It's amazing how tiring it is to ride just 10 laps. You have to move your butt over so your crotch is on the seat edge before a corner, then as you accelerate away from the corner you have to push against .6 to 1 G move body forward and move your butt to the other side for the next corner.
The 1st 5 laps I'm ok, then I'm getting tired, the last 3 laps I'm getting weaker on every corner. Later in the day I have to quit after the 7th lap.
Imagine doing squats with a 50lb back pack, how long can you keep it up?

You need to go to the gym and get a personal trainer; they will whip you into shape so you can enjoy the riding. I did 24 hr fitness a few years back and I'm a former college track athlete/ decathlete but things have changed a whole bunch.

[Buffalo Bill]

I welded on these reinforcing strips across the welds on the underside of the swingarm. That seems like the area of highest stress, I wanna be sure about safety.

[Charlie G]

I welded on these reinforcing strips across the welds on the underside of the swingarm. That seems like the area of highest stress, I wanna be sure about safety.

Bill,

I went through a welding class while in Carpenter Apprenticeship school and have owned a Lincoln mig welder for 25 years, that I used all the time to make brackets, gates, and architectural items, but when a life depends on my welds, I hire a certified welder.

cg

[Guest]

That cat looks stoned..... (subscribed)

Or at least, a little confused. I have a cat that is involved with anything I do outside. If I'm working on the bike and need to go get a part, he's waiting for me when I get back.

[Buffalo Bill]

He ain't stoned or confused. He's just overdressed for hot weather.

[Buffalo Bill]

welded on the bracing

This is old school bracing, I think they were doing this back in the 60s. I was copying the SRAD swingarm.
Anyway, it's solid and only added about 20oz of steel. And it's kinked outward on the chain side for clearance, will have to test it. The chain might wack it when lose.

[Buffalo Bill]

Swingarm widening mod, completed

OK, here's some pics, the swingarm project is completed, successful!
Thanks Kreylyn at katriders.com!
Clearance with Michelin Power Pilot 180/55, it's actually only 178mm wide.
I did not have to bend or reshape the brake arm or bracket, just moved it to the right and spaced with 3 washers and new bolt.
The new chain only has 116 links, 118 is standard, but the mod shortened the swingarm, so 118 was too long.

[Mista M]

At the risk of sounding crass, why didn't you install a gsxr swing arm on the bike. Seems like it would have been a more direct installation.

[Buffalo Bill]

Not a direct installation, the K frame needs extensive mods to make it work. Old timers on katriders.com say it's not worth the hassle.