Twinpot Brake upgrade on 78 Skunk

i have read through this and must have missed something but I just bolted up discs from a '83 GS750 and everything looks great except the bolts bottom out. I noticed the disc mounting surface is thinner than on a '78. Do I need a spacer or shorter bolts?

[salty_monk]

Reminding people that on the 80+ bikes you need to cut about 4mm off your speedo drive dust cover:

[salty_monk]

Yes I've not seen it cheaper than that for new OEM.

if you need Pistons the 250 had one caliper on it up to 2006 and the pistons are likely to be decent on most available in my experience.

Thanks. Looks like shipping would be about $8, so $41 total. Save at least $5 anyway.

[mmattockx]

Local guy & many online list the identical price of $46.39. Seems like some collusion going on?

Anyone seen it cheaper?

List price is $46.39, so that is why the same price all over. Partzilla lists it for $33.42, no idea what shipping is.

http://www.partzilla.com/parts/detail/kawasaki/KP-43020-1054.html

Mark

Quick survey - anybody know who has the best price & delivery for OEM rebuild kits (basically just the spring & piston with seals) for the Kawasaki Master Cylinders? Looks to be part #43020-1054 for the one I have from a '99 Concours. Do NOT want K&L

Local guy & many online list the identical price of $46.39. Seems like some collusion going on?

Anyone seen it cheaper?

[salty_monk]

I got more bracket sets in recently. I also have a couple of complete sets of later model calipers, rotors & brackets (everything except the 10mm bolts).

[salty_monk]

Looking good! Thanks for posting a pic!

14355554_548195212044783_8691872777480229233_n.jpg thanks works great

[salty_monk]

- Yep what he said

[Chuck78]

There was no confusion on my end, as I said above, no, absolutely not. The Honda rotors and Kawasaki calipers will work, however. You can sell your current setup and recover plenty of your investment enough to buy the twinpot parts to fit the stock setup. The bandit rotors and calipers would require different brackets and rotor spacers, and custom wider triples and custom axle spacersto fit the stock forks. Basically the same would be required to fit the bandit forks properly - custom offset triples & axle spacers/bearings and speedometer drive.

[Cassius086]

Sorry for the confusion, Chuck. Allow me to clarify


I was wondering if the Bandit's rotors and caliper combo would work w/ Salty's bracket if I reverted back to an otherwise stock GS front end.

FWI, I was using 89 GSXR750 triples (Spiegler upper clamp so I can run handlebars) with the Bandit front end...stance is a bit lower and handling is a bit sharper, but I don't ride hard enough to really test limits of it any how. I mainly did the mod so for radial tires and much improved braking. Rear Bandit wheel in stock swinger, too.

[Chuck78]

In a nutshell, swapping modern front ends to vintage bikes is SUBSTANTIALLY more complicated than most amateurs give it credit for, as generally most seem to only consider steering stem bearing sizes and stem lengths, & if they are a step beyond that, they will consider the overall fork height. It is far more complicated than that in regards to chassis geometry, spring rates, & damping carachteristics.. which is why cartridge emulators, sonic springs, the twinpot brake mod, & adding 1/2" to 1" longer quality $200-300+ rear shocks is the best easiest way to go to make the most impact on how to improve the ride of your GS.

CBR600F3 (& Last year of the F2) forks in Honda PC800 triples & axle with the steering stops modified is one of the more straightforward front end swaps to get a cartridge front end, but it is more straightforward because it uses sliding 2 piston calipers... plenty of clearance for wider vintage wheel spokes.
CBR600F4 forks and brakes in 2nd Gen late 90's VMAX 1200 triples is the way to run the 6 piston calipers, but yours won't fit it. This still is close to rubbing the spokes snd nay require clearance milling the calipers slightly.

Both options will require custom wheel bearing and axle spacers, larger bearings, and probably custom rotor soacers.
These combinations (the triples in particular) will allow you to retain an 18" or 19" front wheel and keep your geometry in the right range to make the bike ride as it should with or operating ground clearance

[Chuck78]

I have a Bandit front end mounted up on my '82 EZ. I am seriously considering going back to stock forks and upgrading the internals. However, I'd LOVE to be able to keep the huge 6 pot Tokico calipers and 300mm rotors. Will your adapter work with this combo, Salty?

The bandit fork slider brake mounts both sit against the slider leg, whereas Salty's Tokico twinpot bracket is made to adapt to the type of caliper that has the upper mount against the slider tube, and the lower mount jutting out a considerable amount more. That is just the beginning of the list of why it won't work. The vertical location distance of the caliper mounts from the axle will be off as well. Not to mentionn you would have to have custom triples CNC machined in a width to accomodate those very thick 6 pot calipers, as they will be maybe 1" or less from each other (no room to fit a wheel between them) on GS triple width spacing.
Also you would need very substantial spacers between the rotors and the hubs
Why is it you want to swap back to stock modified parts? If you want GS wheels back, it's a lot easier to get adapters machined to fit a GS axle (GS1100GK front axle if you need something wider for the bandit forks) than it is to make those 6 piston calipers work on GS forks.

Either way, your triples are going to be the biggest roadblock. If you are running bandit triples and GS wheel, your steering geometry is going to be really out of whack. The bandit triples have minimal offset, generating A LOT of trail on a bike with a lazier-than-bandit steering angle (rake/caster) & much larger diameter front wheel than bandits. You would be best off getting custom triples made up CNC billet aluminium for $325 or so to get somewhere around 50mm of triple offset, give or take. That will make your sport bike front end steering sporty on your older bike. 1" longer rear shocks figured into the equation (the geometry really needs calculated accurately to determine rake and then figure proper triple offset) would assist a lot in making it steer sportier than stock.

Far too often, people swap modern front ends onto bikes with no regard for triple offset/front tire diameter/rake&trail geometry/ground clearance... you either end up with a bike that has fancy brakes and front damping but steers like a dump truck, or you get a bike with better brakes and damping but steers slightly slower than stock and has no ground glearance and ruins that nice 4 into 1 exhaust from hitting speedbumps and steep approaches...

[Cassius086]

OK...

I am going to read thru the thread, but thought I'll throw out a question anyway...

I have a Bandit front end mounted up on my '82 EZ. I am seriously considering going back to stock forks and upgrading the internals. However, I'd LOVE to be able to keep the huge 6 pot Tokico calipers and 300mm rotors. Will your adapter work with this combo, Salty?