Shaving pounds to add performance, ? on component weight

[landspeedrich]

With that tip on the V&H 4-1 and center stand weights, as well as lifting up the GS1100E chain gaurd I have sitting here and a few other thoughts, I've revised the weight savings to approximately 74-77 lbs depending on changing to GSXR rearsets and complete battery delete vs tiny Lithium Ion battery to help kickstart easier. Still have to research more on battery delete options.

So we'll say 75 lbs shed, 10 lbs added for frame bracing+larger tires+fork brace+lightweight dual disc upgrade. So we're down to about 446 dry weight, so we'd be at about 480 lbs with half a tank of gas & all fluids, 493 lbs with a full tank. This is sounding pretty fantastic! I can't wait to get this process started this spring, get the twinpots and Sonic springs in the front end with some Shinko or Avon tires on wider alloy rims... The SE Ohio twisties will be a new experience with all these mods and weight savings!

Rear brake opinions, and any weight corrections from my list, or other suggestions?

I did a starter delete on a XS 650 bobber motor.I remember a big capacitor and some simple wiring being involved with kickstart only mode.I'll look to see if I still have info on it.If you need some chrome molly check with me before you buy.As I have alot of different tubing sizes in my shop.Can easyly send out what you need real cheap,also have access to water and laser cutting.
Not a big fan of drilling brake rotors.Creates to many stress risers and reduces metal mass you need for good braking.Change feel of braking via pad composition choices.Or via master cylinder Diameters.
Oops happy new year! Rich

[tkent02]

Like you said, the rear brake does not need so much stopping power. I think the rear drum brake setup from the early 550 is lighter than any of the disc brakes. I can weigh this stuff in about a week if you want to know how much lighter it is.

[Chuck78]

My wifes 77 gs550b has the drum rear, & the stopping power is dismal...

[tkent02]

My wifes 77 gs550b has the drum rear, & the stopping power is dismal...

You should fix her brake, it really shouldn't be that bad, it should be enough for a rear brake. I'm guessing the original 35 year old petrified brake shoes are still in there?

[Chuck78]

You should fix it, it really shouldn't be that bad, it should be enough for a rear brake.

Brand new ebc shoes& well adjusted & it's still not too great even on a lighter gs550. My 77 gs750b on the other hand has too much rear brake!

I'm looking into a rotor adapter & custom caliper bracket to fit a slightly smaller modern rear rotor & lightweight brembo caliper that T8 is going to have made up.

[tkent02]

Brand new ebc shoes& well adjusted & it's still not too great even on a lighter gs550. My 77 gs750b on the other hand has too much rear brake!

I'm looking into a rotor adapter & custom caliper bracket to fit a slightly smaller modern rear rotor & lightweight brembo caliper that T8 is going to have made up.

Did you bed those EBC brake shoes in correctly? It takes a lot of heat to get it working right.

I'm curious what the whole thing will weigh when you are done with it compared to the 550's drum brake.

[Chuck78]

Did you bed those EBC brake shoes in correctly? It takes a lot of heat to get it working right

Bed them properly??? Details, please

[Chuck78]

I'm curious what the whole thing will weigh when you are done with it compared to the 550's drum brake.

Rotor will be approximately 2.75lbs lighter, & I'm guessing 1.9-2.25lbs less on the caliper& hanger bracket.
T8er could tell us better. The single disc front rotors weigh 4 lbs vs the twinpot mod cbr900rr rotors at 1lb each... wow.

[tkent02]

EBC's website should have instructions and some info about the theory behind it, but basically go about 60 mph, drag the brake to get it hot and then do moderate braking down to maybe 30 mph a few times, maybe four or five. You will feel the braking start to increase after about the third time.

[gmansyz]

Rear Brake

How about a slotted front brake rotor, right side, in the rear??? Works. Is lighter, slotted and thinner.
G

[Steve]

fit a smaller gas tank, every liter of gas weighs 1.6lb. less gas = less weight

Little number transposing going on here.One gallon of gas is 6.1 lbs.Imperial gal. is 7.3 lbs. ...

OK, continue on with your math, if you want to correct somebody.

There are 3.78541 liters per gallon.

Divide that into the 6.1 pounds per gallon, you will see that each liter weighs 1.61145 pounds.



Since we are getting more technical, let's also get precise.

That gallon of gas is actually 6.073 pounds. Divide that into liters, each liter weighs 1.60432 pounds.



In other words, you are both correct, but you were thinking he was wrong.

.

[Chuck78]

How about a slotted front brake rotor, right side, in the rear??? Works. Is lighter, slotted and thinner.

At first when I read this I said no way, the fronts are tankers as well. I read another report of the front rotor weights, and apparently the 275 or 276mm dual rotors are the 4 lb rotors, the single disc 295/296mm that I am replacing is actually 5.2lbs! I'll be updating my weight stats again.


Although I am considering using the CAD drawings that a fellow member has made up to have a machinist make a rotor hub adapter and caliper adapter to use an 02 Yamaha rear rotor and Brembo caliper, I am still considering other options as the custom milling and CNC work will cost a small fortune. I did just stumble across this when looking for similar diameter rotors with the correct PCD and offset, wondering if they have the correct height of surface area for the old calipers, and if any newer GSX calipers will bolt to the old style GS brake bracket?:

Front Brake Disc for GSX 1100 F EF GS 1150 EF EF2 EG ES3 ESE ESG 83 86 88 93 97

Outside Diameter: 276mm Inside Diameter: 56mm
Bolt Hole Circumference: 78mm
Bolt Hole Qty: 6
Bolt Hole Size: 10.5mm
Thickness: 5mm
Offset: 21.5mm
Biding Discs will fit for:
SUZUKI GSX 1100 F FJ,FK,FL,FM,FN,FP 1988-1993
SUZUKI GSX 1100 F Katana FJ,FL,FM,FN,FR,FS 1988-1997
SUZUKI GS 1150 EF 1985
SUZUKI GS 1150 EF2 1985
SUZUKI GS 1150 EG 1986
SUZUKI GS 1150 ES3 1983
SUZUKI GS 1150 ESE 1984
SUZUKI GS 1150 ESF 1985
SUZUKI GS 1150 ESG 1986
SUZUKI GSX 1100 EF EFE,EFF,ESE 1984-1986

Round Front Brake Disc Rotor Suzuki GSX 1100 F 88-93 GS 1150 GSX 1100 EF 84-86


GSX 1100 F FJ,FK,FL,FM,FN,FP 1988-1993
GSX 1100 F Katana FJ,FL,FM,FN,FR,FS 1988-1997
GS 1150 EF 1985
GS 1150 EF2 1985
GS 1150 EG 1986
GS 1150 ES3 1983
GS 1150 ESE 1984
GS 1150 ESF 1985
GS 1150 ESG 1986
GSX 1100 EF EFE,EFF,ESE 1984-1986
GSX 1100 EF 1986-

Model: 140N-B
Disc Outer Diameter: 275 mm
Disc Inside Diameter: 56 mm
Disc Thickness: 5 mm
Number of Holes: 6
Bolt hole Diameter: 10.4 mm
Boltpattern Diameter: 78 mm
Offset: 21.5 mm

[tkent02]

OK, continue on with your math, if you want to correct somebody.

There are 3.78541 liters per gallon.

Divide that into the 6.1 pounds per gallon, you will see that each liter weighs 1.61145 pounds.



Since we are getting more technical, let's also get precise.

That gallon of gas is actually 6.073 pounds. Divide that into liters, each liter weighs 1.60432 pounds.



In other words, you are both correct, but you were thinking he was wrong.

.

Steve, before you carry the weight of gasoline out to three digits past the decimal you better have a temperature and an alcohol and water content.

The gasoline only adds weight if the tank is full. Leave it half empty is as good as having a smaller tank.

[Agemax]

At first when I read this I said no way, the fronts are tankers as well. I read another report of the front rotor weights, and apparently the 275 or 276mm dual rotors are the 4 lb rotors, the single disc 295/296mm that I am replacing is actually 5.2lbs! I'll be updating my weight stats again.


Although I am considering using the CAD drawings that a fellow member has made up to have a machinist make a rotor hub adapter and caliper adapter to use an 02 Yamaha rear rotor and Brembo caliper, I am still considering other options as the custom milling and CNC work will cost a small fortune. I did just stumble across this when looking for similar diameter rotors with the correct PCD and offset, wondering if they have the correct height of surface area for the old calipers, and if any newer GSX calipers will bolt to the old style GS brake bracket?:

Front Brake Disc for GSX 1100 F EF GS 1150 EF EF2 EG ES3 ESE ESG 83 86 88 93 97

Outside Diameter: 276mm Inside Diameter: 56mm
Bolt Hole Circumference: 78mm
Bolt Hole Qty: 6
Bolt Hole Size: 10.5mm
Thickness: 5mm
Offset: 21.5mm
Biding Discs will fit for:
SUZUKI GSX 1100 F FJ,FK,FL,FM,FN,FP 1988-1993
SUZUKI GSX 1100 F Katana FJ,FL,FM,FN,FR,FS 1988-1997
SUZUKI GS 1150 EF 1985
SUZUKI GS 1150 EF2 1985
SUZUKI GS 1150 EG 1986
SUZUKI GS 1150 ES3 1983
SUZUKI GS 1150 ESE 1984
SUZUKI GS 1150 ESF 1985
SUZUKI GS 1150 ESG 1986
SUZUKI GSX 1100 EF EFE,EFF,ESE 1984-1986

Round Front Brake Disc Rotor Suzuki GSX 1100 F 88-93 GS 1150 GSX 1100 EF 84-86


GSX 1100 F FJ,FK,FL,FM,FN,FP 1988-1993
GSX 1100 F Katana FJ,FL,FM,FN,FR,FS 1988-1997
GS 1150 EF 1985
GS 1150 EF2 1985
GS 1150 EG 1986
GS 1150 ES3 1983
GS 1150 ESE 1984
GS 1150 ESF 1985
GS 1150 ESG 1986
GSX 1100 EF EFE,EFF,ESE 1984-1986
GSX 1100 EF 1986-

Model: 140N-B
Disc Outer Diameter: 275 mm
Disc Inside Diameter: 56 mm
Disc Thickness: 5 mm
Number of Holes: 6
Bolt hole Diameter: 10.4 mm
Boltpattern Diameter: 78 mm
Offset: 21.5 mm

what other options are there to a round rotor?

[Chuck78]

what other options are there to a round rotor?

ACTUALLY...

Those silly@$% wave design rotors that are ugly as sin...yet all the rage with the modern streetfighter/sportbike crowd



Darnit this off-season GS-Superbike-Retrofit/Rebuild internet research is addictive, I gotta get off the internet and get back to working on my massive house rehab project, or else I'll never get it done to the point where I can start modifying bolting on all these parts!!!!! Thanks for all the encouragement!