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

[Buffalo Bill]

Bigger back wheel and tire too

Bigger back wheel and tire too

Ok, I uploaded a 88-92? gsxr 5.5 wheel with 190/50 Shinko into my 1990 Katana swingarm.

Measured 9" across at first and I needed another half inch to get the caliper in there, so I pushed it out to 10.5".

OK This Will Work!

The 190 is actually 195 wide, with 7mm clearance on the right.

Only 4mm clearance on the left

I want to get a 180/55 in there, 170/60 acceptable.
The brake arm will need to be kinked out 5-10mm, and a longer axle bolt would be a good idea too.

 

[Buffalo Bill]

Fitting the body panels on and adjusting new fitting issues.
The taller block raised the carbs, that raised the airbox, that pushes up on the tank.
See the gap between the side panel and tank?
Was able to get the shark gills to fit, had to cut some away from the lower side.

 

[Charlie G]

It good looks from where I sit. It would be painful to have to wait till spring to really ride it. I'll have my lift next week. Thanks.

cg

 

[Buffalo Bill]

It is so painful waiting for spring.
Southerners may gloat now, but not May through October.

 

[Guest]

Should consider a first gen busa front end for that, my sons 90 600 has one on it. Looks really nice with it, straight spoke wheel will match your rear.

 

[Buffalo Bill]

Man, what a tedious process it is to tune carbs, the gas stench is so depressing.
Anyway, on this project I got the idle down to normal range, but below 2000 it wants to die out.
I have some more things to try, and check out.

 

[Buffalo Bill]

Making progress on the carbs, the fact is they were just overdue for rebuild, besides re-jeting them for the 1127.
Checked the compression today: #2 cylinder only shows 145psi, the others all show 170-180psi. Kinda at the limit of acceptable difference.
Engine was tested right after running so it was still warm and wet.

 

[Charlie G]

: #2 cylinder only shows 145psi, the others all show 170-180psi. Kinda at the limit of acceptable difference.

Valve adjustment?

 

[Buffalo Bill]

Well, I did that last summer, 3 new shims for the #2 valves.
I was hoping this would be a pop-in engine swap :moody:, but a performance head and valve job is not so pricey.
Glad I did not start this last summer when I was riding track days.
Whatever, long time before next summer.

 

[Buffalo Bill]

Making room for wide tires on the back

Making room for wide tires on the back

Ok, I'm working on widening the swingarm.
This is a killer method pioneered by Kreylin, one of the best over on katriders.com_Fitment of a wider tire.

This is Krey's pic from his stickey

This is a swingarm I just got on ebay

This is my marks for the cuts, will be doing that tomorrow, (kinda snowed in here for a couple days)

 

[Buffalo Bill]

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

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

Put it in there

[TABLE="class: tborder, width: 100%, align: center"]
[TR]
[TD="class: alt1"]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.

[/TD]
[/TR]
[TR]
[TD="class: alt1, align: right"][/TD]
[/TR]
[/TABLE]

 

[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.