Author Topic: Seeley Honda CB750F - SH7-655F - - the rebuild starts  (Read 14402 times)

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Offline 01Thomas

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Seeley Honda CB750F - SH7-655F - - the rebuild starts
« on: February 22, 2015, 12:24:31 PM »
Hi
I've just started rebuilding my Seeley Honda.

A bit of background: I'd heard of this Seeley sitting the town of Middelburg when I still lived in Cape Town in 1987 - and a year later I found myself being transferred to Middelburg. When I put some feelers out, it was still there, in the backroom of a bike shop, forlorn, dirty, dusty, incomplete and hacked about - so I bought it.
I'd heard about Seeley Hondas and I was interested because I already owned a fairly original CB750 Four (K1) [still do, to this day].

There are three Seeley Honda CB750 Fours known to be in South Africa, of which mine seems to be the youngest - it's the only one built for a rear disc-brake. It is a frame built by Seeley for the 1975/6 CB750F (and later?), the model with the rear disc brake and electrical connection box bolted to a tab on the front left frame downtube.

And just so everyone knows it up front: mine has been hacked by various Previous Owners.
1. The sidestand bracket has been ripped off and been brazed back on***,
2. one of the RHS shock mounting tabs has broken off and been replaced by a suitably-shaped piece of steel***,
3. it seems someone at one stage tried to weld seat mountings (?) to the frame rails*** and
4. someone has cut the hoop off the frame (underneath the bumbox of the seat)***.

Nevertheless, as 60 000 km have taught me, it remains a great bike to ride, one that handles well and runs well.

Along with life happening and another transfer, the get-it-useable project took another 3 years, by which time I had relocated to the bustling metropolis of Ellisras - even further from civilisation.

I rebuilt the Seeley with the remnants of it's original seat. The fuel tank had a big gash in it which needed welding; I then kept the tank polished and clear-coated and fitted a Rickman full fairing. I rebuilt the engine to stock specs but fitted it with a very nice custom-built 4-1 exhaust and pod-filters inside the gutted airbox. I also made contact with Axel Griessman (The Satanic Mechanic) and we exchanged notes vial email & fax & snailmail. Eventually he had a replicas of the original seats made and sold me one - which I kept but didn't use (more on that much later). He also told which Koni shocks to get for the Seeley Honda - the dampers being fairly regular Konis but the springs being lighter than what is normal for 750 Fours.

In this condition I ran the bike for about 60 000 kilometers and about 3 further relocations found me back in Cape Town. Here I suffered the first real failure: one morning while commuting to work on the Seeley the front-end felt dodgy whenever I applied the brakes. a quick roadside check didn't reveal anything significant so I carried on to work slowly and carefully, and in the evening went home equally slowly and carefully.

At home with decent light I found the problem: the front wheel, a cast aftermarket wheel made by Melba of Italy in the mid-1970s, had cracked all it's cast spokes adjacent to the hub. The whole plot was only kept together by the coarseness of the fractures.

I fitted a spare stock Honda (steel) front wheel and used the bike as before - until sometime later it started smoking. This coincided with another relocation, this time to the coastal city of Durban. Life carried on happening... and it's only now some 8 years later that the Gods have smiled on me and suggested that the time for a total rebuild may have come.

Which brings us to October 2014 when I started stripping the bike down and buying engine spares. Yesterday I started the first part of the re-assembly.

*** photos of the damaged areas will be posted as the rebuild progresses.
As I haven't figured out how to place the photos where they are accompanied by the relevant text, here with a quick description:
Photo 1: As I bought the Seeley in about 1987, having brought it home
Photo 2: the way it was when in regular use
Photo 3: a detailed photo of the cracked front wheel
Photo 4: the stripdown starts - Sept/Oct 2014
1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline Stev-o

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #1 on: February 22, 2015, 12:33:13 PM »
Great story...subscribed.
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline jaguar

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #2 on: February 22, 2015, 03:59:26 PM »
Glad to see another Seeley being rebuilt.
I know I have had a million questions while working with mine, and you have been a huge help.
Can only hope that I might be able to return the favor.


Offline 01Thomas

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #3 on: February 24, 2015, 01:32:53 PM »
Ok, so the stripdown started in September/October 2014 and what immediately became apparent is that the frame has picked up some rust - through the nickel-plating. These are in the generally inaccessible areas such as behind the steering head and behind the gearbox above the swing-arm. I suspect this is the result of riding it in coastal cities with a humid, salt-laden atmosphere.

What to do about this? First prize would be to sent the frame to Roger Titchmarsh (sp?) in the UK and have him strip, restore, reweld and replate the frame. Nice, but Prohibitively Expensive.
What I decided to do is to treat the rust with several applications of a commercial phosphoric acid rust-buster solution, polish the frame up and then have it the whole thing sprayed with two coats of clear lacquer.

In the photo below we can see the steering head after the clearcoat has been applied, with the chassis number and the date of manufacture as well as a `151` stamped into the steering stem just above the steering lock stop (which has also been "modified" by some or other PO).

Jaguar, I've removed my steering head bearings, measured up and I think I've found a solution which I'll share in a few days time when I've bought the bearings.

I do remember that the steering head bearings fitted when I first rebuilt the bike in the early 1990s were ball bearings (not taper roller); these were probably the originals. I then replaced those with mixed bag of Timken and Koyo (metric & imperial) taper rollers. What I have now seems like an even better solution, more on that later.
1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline 01Thomas

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #4 on: February 24, 2015, 01:35:46 PM »
Oh and these are the engine mounting plates, also derusted and clearcoated.
1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline 01Thomas

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #5 on: February 24, 2015, 01:47:02 PM »
These are the rear axle components. When I get to fitting the stock rear wheel I'll have to see about bearings and/or bushes to match the 17mm rear axle.
The curved hook welded on to the LHS of the axle is my own mod. It rests on the swingarm and allows me to only need one spanner on the RHS axle nut to loosen and remove the axle. And once the nut has been unscrewed it gives a good grip for pulling the axle out to the left. (No more beating with a hammer and mushrooming the threads...) And yes, the calliper is still to be refurbished and the washers at either end will be replaced with stainless items.
1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline SOHC4 Cafe Racer Fan

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #6 on: February 24, 2015, 02:36:02 PM »
I love how all of the chassis components have matching numbers.  I bet Seeley had decent quality control before giving the parts the numbered stamp.
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
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2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
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Offline Retro Rocket

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #7 on: February 24, 2015, 03:04:39 PM »
Im in.... ;)
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline simon#42

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #8 on: February 24, 2015, 03:24:14 PM »
I love how all of the chassis components have matching numbers.  I bet Seeley had decent quality control before giving the parts the numbered stamp.

probably the opposite , the mounts were made individually to allow for production differences in the frames . otherwise the engine wouldn't fit .

a good frame though should make for a great bike . i would stick with the spoked wheels  though all the period light alloy ones will eventually break like yours has .

Offline scottly

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #9 on: February 24, 2015, 05:45:43 PM »
These are the rear axle components. When I get to fitting the stock rear wheel I'll have to see about bearings and/or bushes to match the 17mm rear axle.
The curved hook welded on to the LHS of the axle is my own mod. It rests on the swingarm and allows me to only need one spanner on the RHS axle nut to loosen and remove the axle. And once the nut has been unscrewed it gives a good grip for pulling the axle out to the left. (No more beating with a hammer and mushrooming the threads...) And yes, the calliper is still to be refurbished and the washers at either end will be replaced with stainless items.
My axle is like Jag's; 15mm with alloy nuts at each end. What is the ID of the hole for the F caliper bracket, 20mm?
My frame doesn't have a date or any other markings except for SH 7521. I wonder what "151" means?
Don't fix it if it ain't broke!
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Offline jaguar

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #10 on: February 25, 2015, 04:18:47 AM »
Mine also doesn't have a date.

Offline 01Thomas

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #11 on: February 25, 2015, 11:17:52 AM »
My axle is like Jag's; 15mm with alloy nuts at each end. What is the ID of the hole for the F caliper bracket, 20mm?
My frame doesn't have a date or any other markings except for SH 7521. I wonder what "151" means?
I'll take accurate measurements of the rear axle components when I have fitted the motor - because I may have to line everything up again due to fitting a stock wheel.

Meanwhile my new primary drive chains arrived today :-)
1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline 01Thomas

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #12 on: March 03, 2015, 10:55:14 AM »
I'm a great fan of the metric system - probably because
A. I'm not used to counting in twelves or eights, and
B. because it's the system of choice in South Africa, and
C. it's the system of choice in my Fatherland, Germany.

It would seem Colin Seeley couldn't see his way clear joining to the metric system. This shows up in the Seeley Honda's steering head, where a frame component is engineered by an imperialised brain to take a steering stem engineered in a metric country.

My lower steering head bearing Inside Diameter (the receptacle of the bearing outer ring or cup)  measures 49.5mm (why not just 50mm?) and the steering stem Outer Diameter comes to 29mm.

Hammering out the old bearings (which I fitted in 1990?) made the writing/dimensions illegible - so much for that avenue...

I have a good selection of bearing manufacturers' catalogues, from FAG, SKF, Nadela, NSK etc, and these books didn't help at all. Until last week someone gave me a catalogue from Timken dated 1985. And lo and behold I found a taper-roller bearing with a 29mm ID. And the OD comes in at 50.292mm. And this is what I bought and fitted today.

1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline 01Thomas

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #13 on: March 03, 2015, 11:10:44 AM »
To help seal (Seel ? hah hah ) this lower bearing against the elements and keep the grease in I have had a large stainless washer made: the ID is 30mm and the OD is 49.5mm with the thickness being 1mm. I fitted this to the steering stem, followed by the bearing inner ring.
The first photo shows how snugly the washer fits in the bearing housing.
The second photo shows how the washer and the bearing inner ring sit assembled on the steering stem.
And the third photo shows the steering stem with sealing washer and bearing inner ring installed (actually pre-installed) in the steering head.

Greasing and final installation will follow when I have the upper bearing sorted out.

Oh and let me not rely only on photos. Just to make it clear and in print: the bearing I just installed as a lower steering head bearing is a Koyo L45449/10. That is the number on the package, with the inner ring having the number Koyo L45449 and the outer ring having the number Koyo L45410 (or the other way around - but they are sold together as one item).


« Last Edit: March 29, 2015, 12:00:44 PM by 01Thomas »
1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline 01Thomas

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #14 on: March 03, 2015, 11:14:01 AM »
And here is the third photo:
1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline 01Thomas

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #15 on: March 03, 2015, 11:15:28 AM »
To help seal (Seel ?) this lower bearing against the elements and keep the grease in I have had a large stainless washer made: the ID is 30mm and the OD is 49.5mm with the thickness being 1mm. I fitted this to the steering stem, followed by the bearing inner ring.
The first photo shows how snugly the washer fits in the bearing housing.
The second photo shows how the washer and the bearing inner ring sit assembled on the steering stem.
And the third photo shows the steering stem with sealing washer and bearing inner ring installed (actually pre-installed) in the steering head.

Greasing and final installation will follow when I have the upper bearing sorted out.

Oh and let me not rely only on photos. Just to make it clear and in print: the bearing I just installed as a lower steering head bearing is a Koyo L45449/10. That is the number on the package, with the inner ring having the number Koyo L45449 and the outer ring having the number Koyo L45410 (or the other way around - but they are sold together as one item).



1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline 01Thomas

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #16 on: March 03, 2015, 11:16:03 AM »
I'm a great fan of the metric system - probably because
A. I'm not used to counting in twelves or eights, and
B. because it's the system of choice in South Africa, and
C. it's the system of choice in my Fatherland, Germany.

It would seem Colin Seeley couldn't see his way clear joining to the metric system. This shows up in the Seeley Honda's steering head, where a frame component is engineered by an imperialised brain to take a steering stem engineered in a metric country.

My lower steering head bearing Inside Diameter (the receptacle of the bearing outer ring or cup)  measures 49.5mm (why not just 50mm?) and the steering stem Outer Diameter comes to 29mm.

Hammering out the old bearings (which I fitted in 1990?) made the writing/dimensions illegible - so much for that avenue...

I have a good selection of bearing manufacturers' catalogues, from FAG, SKF, Nadela, NSK etc, and these books didn't help at all. Until last week someone gave me a catalogue from Timken dated 1985. And lo and behold I found a taper-roller bearing with a 29mm ID. And the OD comes in at 50.292mm. And this is what I bought and fitted today.


1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline Just4fun

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #17 on: March 03, 2015, 08:45:31 PM »
This is a great build, subscribed!


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Offline jaguar

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #18 on: March 04, 2015, 05:18:35 AM »
Those numbers on the lower bearing should equate to the same dimensions of the OEM Honda frame/bearing.
The issue I have run into/and not solved yet, is that the top bearing mixes standard and metric a fair bit more.

Offline 01Thomas

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #19 on: March 04, 2015, 12:23:18 PM »
This Koyo lower bearing outer ring generates a fair amount of interference fit when Installed. Nothing out of the ordinary but more than I'm used to with stock Honda SOHC or Moto Guzzi steering head bearings. More on the upper bearing as soon as I have something concrete to report.

Meanwhile my workshop time this evening was spent sorting out what must go for plating (chrome or nickel or zinc [galvanising]) and painting. And some of the fittings are just going to be polished - footrest plates come to mind.

Those numbers on the lower bearing should equate to the same dimensions of the OEM Honda frame/bearing.
The issue I have run into/and not solved yet, is that the top bearing mixes standard and metric a fair bit more.

1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline 01Thomas

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Re: Seeley Honda CB750F - SH7-655F - - Upper Steering Head Bearing
« Reply #20 on: March 29, 2015, 11:29:39 AM »
OK, the long-awaited upper steering head bearing.
Here we once again have a Colin Seeley-anomaly: his refusal to make something (the frame's steering head) metric so that it can tie in with Honda's metric component, the steering stem.

I have found a way around it, but it's not simple and if you're located in the sticks it's going to take some arrangements to make it work.

It came to my attention a couple of years ago that certain bearing shops can grind grooves into a bearing's outer ring to accommodate a circlip or some other form of retaining ring. Armed with this knowledge I went to a local bearing franchise outlet (Bearing Man) to find out what they could do about grinding the whole outer ring down to reduce a bearing's outer diameter, or conversely could they do something about increasing a bearing's inner diameter?

"Yes we can" they said.
So this is what I did: I ordered a Timken taper roller bearing  with an outer diameter to suit the Seeley steering head's inner diameter. This particular set-up has to be ordered in two parts: Timken 07210K will get you the outer ring with an OD of just over 52 mm and Timken 07100SA (ID 25.4mm) gets you the matching inner ring.
I then had the inner ring ID ground open to match the steering stem's 26mm and bob's your uncle.

Fortunately for me Durban is a port city (can you believe the largest harbour in the entire southern hemisphere?) and these skills are available on my doorstep as it were.
Sooooo... my steering head is assembled with new upper and lower bearings and a good helping of synthetic NLGI-2 grease.  I have fitted the upper fork yoke (a.k.a. triple tree).
« Last Edit: March 29, 2015, 11:34:45 AM by 01Thomas »
1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline 01Thomas

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Re: Seeley Honda CB750F - SH7-655F - - forks
« Reply #21 on: March 29, 2015, 11:51:36 AM »
while the steering head bearing was happening, I got busy with the forks. The stanchions were severely rusted and pitted and so I had them re-hardchromed and ground to size.

When I was still riding the bike (some years ago) I found the best suspension set-up for me (at 68kg) was standard forks with Trick-it progressively-wound fork springs (from thooooose days) topped of with the Honda-specified amount of SAE 80W-90 gear oil. I know, the gear oil is a long way from what's recommended, but several years of experimentation led to this solution.

What I've also had done all those years ago is to modify the fork caps to take an allen key. I chucked them in a lathe and machined off the hex. I then found large metric allen screws which fitted inside the hole and had them welded into the hole. I cleaned it all up nicely and then had the fork tops chromed.  This did two things: it gave me a different flat-top look and it preloaded the fork springs without having to resort to loose spacers. You can see them in the previous set of photos.

I've also had my clip-ons chromed and have fitted them to the forks, on the bike. Ditto with the bracket which carries my ignition switch - this goes on the left fork, between the upper and lower yoke.

And I've dug out the forward fuel tank rubbers and glued them into place. I glue them on to the frame because I found they pop off a bit too easily.
« Last Edit: March 29, 2015, 12:08:39 PM by 01Thomas »
1971 Honda CB750 Four K1 [Engine: CB750E-1113521 / Frame: CB750-1113838]
1977 Seeley Honda CB750F (F1) [Engine: CB750E-2551214 / Frame No: SH7-655F]

'96 Yamaha YZF750SP & '81 Moto Guzzi SP1000 & '80 Moto Guzzi 850 LeMans II & '82 Bimota KB-3 [Frame No 49] & '66 Ducati 50 SL/1 & '53 Miele K-50 & '38 Miele 98

Offline jaguar

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #22 on: March 29, 2015, 04:44:28 PM »
I was told that it was nearly impossible to have the ID of the cone gearing ground open.

Offline Stev-o

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #23 on: March 29, 2015, 04:56:54 PM »
Why would he not make the head race metric?
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline scottly

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Re: Seeley Honda CB750F - SH7-655F - - the rebuild starts
« Reply #24 on: March 29, 2015, 07:49:08 PM »
Tom, what did it cost to have the race ID opened up? I suspect they used a sort of center-less grinding operation?
Regarding the tank rubbers, does your frame have posts to mount them???

Steve, the tubing used for the steering head was rather thin wall, and the appropriate metric bearing would have dropped right through the ID. With the 2" OD race, there is enough material (barely) to machine a shelf for the race to seat on.
Don't fix it if it ain't broke!
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