G'day Eh!

teeb · Sep 9, 2007

G'day Eh, this is the great white north, I'm Bob McKenzie and this is my brother Doug.... (if anyone remembers Second City).
Actually this is Steve from Hamilton (Ontario) and I've recently joined as I am working to 'put the 1974 Norton back together'. It has been off the road for ... well ... 20 years as some ‘technical issues’ arose. I've had six other bikes since then, but nothing would replace the Norton.
Then this wonderful thing called the 'net came along.
No I haven't been lurking, just reading a lot of old posts. Thousands. What a site!
Hmmm .... seven ways to fix the swing arm pivot ... and I had designed up a tapered preloadable bearing conversion... it would have been trick but expensive… oh well.
Well I am a mechanical engineer designing automation and machinery (with experience in the bearing industry, robotics, etc.), so I thought I'd start contributing a bit of information and knowledge.

Ron L – nice front brake set up. I am working on the same. Years ago I picked up a set of brand new disks at a swap meet (2 front 1 rear that are very similar to yours) for $45. The owner bought the bike to race and sold the disks brand new; not good enough I guess. They are 5 bolt, 290mm and weight about 3 lbs.

There has been a lot of information about master cylinder bore sizes. Well, I measured some. A '13' m/c from a 650 Cagiva Alazzurra has a bore of exactly 12.7mm.
Master cylinders from my (now sold) 1981 GS750 E, 1981 GS100E, and 1982 GSXR110 Katana are also ‘imperial’ sizes, both front and back.

I do have a couple of mid 70’s (?) M/C’s from Honda's (the ones with the round reservoir and ugly brown/bronze anodizing) and they are actually exactly 14mm if you can believe it.
So if you are trying to work out your hydraulic ratios…. think imperial.

I also purchased the entire front and rear end off a 1987 Cagiva Alazzurra to get the cast wheels, Brembo brakes, Marsocchi forks and really nice cush drive in the back end. The bike had 4600 original km’s and had probably never seen rain – some more racer cast offs I’m afraid.
These front brakes? With the 12.7mm Cagiva/Brembo M/C and two FO5 calipers (two 32.0mm pistons each caliper) I get a ratio of 25.4:1. Blimey

I also have a 1987 K75S. Why did they stop making this bike?

Anyhow, I’ll try and throw in my 2¢'s worth once in a while.

Later!
Steve.

"It's hard to make things fool-proof when fools are so ingenious."

fastback · Sep 10, 2007

Welcome to the forum Steve!

If you are awoken from your slumbers by the unmistakable zeep zeep zeep of a socket wrench, don't worry, it's just me unbolting your disks by the light the moon.:wink:
Start saving your Canadian Tire Money now - you'll need lots of oil.

Phil

Coco · Sep 10, 2007

Classic.

Probably onlu us Canadians will know what the hell you guys are referring to when we speak of Bob and Doug McKenzie and especially, Canadian Tire money. :wink:

tpeever · Sep 10, 2007

welcome to the forum ya hoser!

teeb said:
G'day Eh, this is the great white north, I'm Bob McKenzie and this is my brother Doug.... (if anyone remembers Second City).
Actually this is Steve from Hamilton (Ontario) and I've recently joined as I am working to 'put the 1974 Norton back together'. It has been off the road for ... well ... 20 years as some ‘technical issues’ arose. I've had six other bikes since then, but nothing would replace the Norton.
Then this wonderful thing called the 'net came along.
No I haven't been lurking, just reading a lot of old posts. Thousands. What a site!
Hmmm .... seven ways to fix the swing arm pivot ... and I had designed up a tapered preloadable bearing conversion... it would have been trick but expensive… oh well.
Well I am a mechanical engineer designing automation and machinery (with experience in the bearing industry, robotics, etc.), so I thought I'd start contributing a bit of information and knowledge.

Ron L – nice front brake set up. I am working on the same. Years ago I picked up a set of brand new disks at a swap meet (2 front 1 rear that are very similar to yours) for $45. The owner bought the bike to race and sold the disks brand new; not good enough I guess. They are 5 bolt, 290mm and weight about 3 lbs.

There has been a lot of information about master cylinder bore sizes. Well, I measured some. A '13' m/c from a 650 Cagiva Alazzurra has a bore of exactly 12.7mm.
Master cylinders from my (now sold) 1981 GS750 E, 1981 GS100E, and 1982 GSXR110 Katana are also ‘imperial’ sizes, both front and back.

I do have a couple of mid 70’s (?) M/C’s from Honda's (the ones with the round reservoir and ugly brown/bronze anodizing) and they are actually exactly 14mm if you can believe it.
So if you are trying to work out your hydraulic ratios…. think imperial.

I also purchased the entire front and rear end off a 1987 Cagiva Alazzurra to get the cast wheels, Brembo brakes, Marsocchi forks and really nice cush drive in the back end. The bike had 4600 original km’s and had probably never seen rain – some more racer cast offs I’m afraid.
These front brakes? With the 12.7mm Cagiva/Brembo M/C and two FO5 calipers (two 32.0mm pistons each caliper) I get a ratio of 25.4:1. Blimey

I also have a 1987 K75S. Why did they stop making this bike?

Anyhow, I’ll try and throw in my 2¢'s worth once in a while.

Later!
Steve.

"It's hard to make things fool-proof when fools are so ingenious."

Ron L · Sep 11, 2007

Teeb,

Welcome to the pond!

Are the F05 Brembo similar to the F08 two piston type found on the bevel Ducs, MG's, and some mid-80's BMW's? I have a couple sets of F08's stashed away, one that I plan on using to replace the ATE's on my R65 sidecar rig. I also have them on my 900SS bevel. Even without full floating rotors, those things stop!

The more miles I put on the 850 mule, the more I like the 30/34 Brembo setup. I think fork brace may be in this bike's future.

teeb · Sep 11, 2007

Hi Ron,
Yes, the F05 is similar to the F08. Consider the F05 a 'scaled down' version. You can easily tell them apart as the F05 has one pin holding in the pads and the F08 has two pins.
Also, the mounting bolt spacing is smaller on the F05.
F08's came stock on a lot of BMW's (like my K75), Moto Guzzis, Ducati's, etc - probably through the 80's early 90's (?).
I have the F08 calipers off the K75s for service and will check piston diameters to see if a pair of F08's with the stock 5/8" Norton m/c will work together as you can just bolt larger disks (Guzzi cast iron with same offset as the Alazzurra) onto the Alazzurra wheels and with a simple adapter bolt on the larger F08 calipers as well.

mike916sp · Sep 13, 2007

teeb said:
Hi Ron,
Yes, the F05 is similar to the F08. Consider the F05 a 'scaled down' version. You can easily tell them apart as the F05 has one pin holding in the pads and the F08 has two pins.
Also, the mounting bolt spacing is smaller on the F05.
F08's came stock on a lot of BMW's (like my K75), Moto Guzzis, Ducati's, etc - probably through the 80's early 90's (?).

Just to confirm some of the info - Ducati 851's, 888's and 916's from about 89 > 99 were fitted with the single pin F05 calipers. The 996 introduced in 1999 switched to the twin pin type F08 calipers. Not certain about what was fitted to pre 89 Ducatis's though

Ron L · Sep 14, 2007

Just to confirm some of the info - Ducati 851's, 888's and 916's from about 89 > 99 were fitted with the single pin F05 calipers. The 996 introduced in 1999 switched to the twin pin type F08 calipers. Not certain about what was fitted to pre 89 Ducatis's though

Not quite. The F08 is the two piston caliper fitted to bevel drive Ducati's, BMW's, MG's in the '70's and early '80's. These are either black or sometimes gold. The single-pin four piston 30/34 P4 40mm mount caliper was fitted to many european bikes from the early to mid '90's. This is what I used on my Norton's. The late '90's to mid '05 dual-pin dual pistion 30/34 65mm mount caliper was fitted to the 996 and later Ducati's until the new wave of radial mount calipers came into production.

I am not sure what the F05 two piston caliper was fitted on as OEM.

mike916sp · Sep 14, 2007

Ron L said:
Just to confirm some of the info - Ducati 851's, 888's and 916's from about 89 > 99 were fitted with the single pin F05 calipers. The 996 introduced in 1999 switched to the twin pin type F08 calipers. Not certain about what was fitted to pre 89 Ducatis's though

Click to expand...

The single-pin four piston 30/34 P4 40mm mount caliper was fitted to many european bikes from the early to mid '90's. This is what I used on my Norton's. The late '90's to mid '05 dual-pin dual pistion 30/34 65mm mount caliper was fitted to the 996 and later Ducati's until the new wave of radial mount calipers came into production.

Apologies for that Ron - missed the bit about two pots in your earlier post. I was refering to four pot goldlines, which it now now seems are P4's not F05's.

G'day Eh!

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