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71 Roadster rebuild

Member's Norton Restoration Projects

71 Roadster rebuild

Postby freefly103 » Thu May 12, 2016 2:47 am

I've owned my 70 Commando for three years, but seemed to have accumulated a lot of spares. Decided to make more room in the garage by using these to build another bike (if that makes sense).

Done some work on my 70 to upgrade it and keep it running over the last few years, but nothing major, so this will be a fairly standard rebuild.

Here's the pile including engine, trans (not shown), drum brake wheels and fenders, oil tank and carb (not shown). Frame, swing arm, side covers and a few other goodies from a member on here (thanks Cj).

Frame and swingarm. Wheels behind the lift
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Engine
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Timing gear looks good
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Marzocchi forks will not be used:

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Swing arm has been repaired at some point

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Frame looks good

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Any idea which year the frame might be?

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Hint might be the bearing races that came out with the aid of some heat and a drift

The headstock tube looks to be in good condition

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Rear ISOs not so good with lots of rust in the tube

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Does the weld look ok? I cant see any cracks.

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Swing arm gunk
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Spindle coming out with the aid of the bolt from my clutch spring compressor
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Spindle out. Quite pitted
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Next step is to remove the swing arm bushes.

Questions:
Frame year?
Rust inside rear ISO tube - will this clean up ok?
Weld on engine cradle - what to look for in deciding the cradle can be reused?
Last edited by freefly103 on Thu May 12, 2016 6:29 am, edited 1 time in total.
70-750, 71-750, Seeley-750 (Titchmarsh frame, Fullauto Head, Maney crank, cases and barrells, FCRs by NYC Norton)

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Re: 71 Roadster rebuild

Postby grandpaul » Thu May 12, 2016 6:18 am

Might be a '71 frame, but I'm not positive.

Rust inside the iso tube should clean up with some scraping then a small hone. Might result in too-loose fit unless you are able to try 2 or 3 variants of adjustable iso units. No guarantees.

I can't comment on the welds other than they look good from a few feet away.

Spindle has been errantly GREASED instead of lubed with heavy oil. New spindle recommended.

Looks like a decent project.
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Re: 71 Roadster rebuild

Postby gortnipper » Thu May 12, 2016 2:05 pm

Nice trick for pulling the spindle. Will have to try that in a couple days after I get over the flu.
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Re: 71 Roadster rebuild

Postby L.A.B. » Thu May 12, 2016 2:47 pm

freefly103 wrote:Frame year?


1969-70 as it has the cross-member (with the centre stand mounting plates) beneath the gearbox.
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Re: 71 Roadster rebuild

Postby freefly103 » Wed May 25, 2016 3:32 am

Frame and swing arm are out for powder coating. Should be ready in two weeks.

In the mean time, time to get started on other stuff e.g. build front forks.

Delivery of some goodies today from AN and Minnovation (Falcon shocks).

Image

Decided to go with a new tranny cradle. AN kind enough to provide their fork building instructions. Not sure where I would have started without these.
Image


Image
70-750, 71-750, Seeley-750 (Titchmarsh frame, Fullauto Head, Maney crank, cases and barrells, FCRs by NYC Norton)

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Re: 71 Roadster rebuild

Postby grandpaul » Wed May 25, 2016 5:14 am

Building a bike from parts is a heck of an expensive way to do it.

(don't ask how I know this)
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Re: 71 Roadster rebuild

Postby freefly103 » Wed May 25, 2016 6:02 am

Tell me about it.

I have most of what I need. Not the forks obviously. Trying to find good used parts where I can. In the case of the forks, I couldn't find any decent second hand part except for the yokes which I bought on Fleabay for $100.

Now mostly need the missing fasteners, and

Inner primary and outer primary covers

Final drive chain and mudguard

Side stand

Petrol tank

Headlamp, tail lamp

Speedo and tacho.

Just another few bucks!
70-750, 71-750, Seeley-750 (Titchmarsh frame, Fullauto Head, Maney crank, cases and barrells, FCRs by NYC Norton)

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Re: 71 Roadster rebuild

Postby grandpaul » Wed May 25, 2016 6:23 am

I have a decent speedo & tach that I'll sell cheap. Formerly green blob on one of them looks blue now, but they should be good to go.
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Re: 71 Roadster rebuild

Postby freefly103 » Fri Jun 10, 2016 3:00 am

Visited Malta Powdercoat today. Essentially a one man operation running out of a garage which is very common in this part of the world.

He had a few goodies waiting for me:

Image

Image

Looks like he's done a pretty good job. Frame has been blasted, primed and powder coated. I had to sort out a few frame issues before the frame was powder coated, however.

This included removing the head steady bolts from the main frame tube.

One snapped. Managed to retrieve the snapped end but now need to run a tap through there.

What is the thread of that head steady bolt?
Last edited by freefly103 on Fri Jun 10, 2016 5:38 am, edited 1 time in total.
70-750, 71-750, Seeley-750 (Titchmarsh frame, Fullauto Head, Maney crank, cases and barrells, FCRs by NYC Norton)

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Re: 71 Roadster rebuild

Postby L.A.B. » Fri Jun 10, 2016 3:29 am

freefly103 wrote:What is the thread of that head steady bolt?


Assuming you mean the holes for the AV mounts?

5/16 - 24 UNF.
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Re: 71 Roadster rebuild

Postby pierodn » Fri Jun 10, 2016 1:23 pm

Hi.
The cradle has the stock welding.
You can see on all this item if you sand bladt they.
Is a special league welded.
Ciao
Piero

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Re: 71 Roadster rebuild

Postby gortnipper » Fri Jun 10, 2016 3:10 pm

freefly103 wrote: Trying to find good used parts where I can. In the case of the forks, I couldn't find any decent second hand part except for the yokes which I bought on Fleabay for $100.

Now mostly need the missing fasteners, and

Inner primary and outer primary covers

Final drive chain and mudguard

Side stand

Petrol tank

Headlamp, tail lamp

Speedo and tacho.

Just another few bucks!


I have some spares off my bike I just stripped down, in various states. Fork tubes with minor pitting, headlamp bucket with same,fasteners, etc.

Send me a pm if interested.
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Re: 71 Roadster rebuild

Postby freefly103 » Tue Jun 14, 2016 11:47 am

Decided to put the swing arm together today. New bushes and spindle went in with the help of a little heat and cold, the clutch spring compressor and front pulley puller.

Had some time so then put the swing arm and shocks in the frame.

Looks ok, with cafe seat supplied by a Vietnamese co selling cafe seats for Commandos (fit is with standard tangs per Norton seats):

Image

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Frame looks straight but now with the swing arm in, will take a few measurements.
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Lessons from today:
Put the oil tank in first, then the battery tray before the swing arm and engine cradle.
Assume nothing fits without checking and adjusting, and some times modding.

Questions:
After copious reading on here, have decided to ditch the 850 yokes and buy matching 750 yokes for this 70 750 frame. Has any one have actual experience with 850 yokes in a 750 frame?
There is light rust inside the central oil tank. YouTuber's vids suggest soaking the inside with apple vinegar. Any one tried this? Other solutions?

Next:
Install yokes, steering head bearings, forks, tranny, engine (when its back from Steve Maney).
70-750, 71-750, Seeley-750 (Titchmarsh frame, Fullauto Head, Maney crank, cases and barrells, FCRs by NYC Norton)

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Location: Malta

Re: 71 Roadster rebuild

Postby grandpaul » Tue Jun 14, 2016 12:12 pm

I wouldn't install shocks with the damper at the top, unless they are designed to work in that orientation.
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Re: 71 Roadster rebuild

Postby freefly103 » Tue Jun 14, 2016 12:59 pm

Will check the install instructions, but the Falcons installed on my Seeley (by NYC Norton, i.e. with much more knowledge than me) came that way, so assumed that was the correct orientation:

Image

Image
70-750, 71-750, Seeley-750 (Titchmarsh frame, Fullauto Head, Maney crank, cases and barrells, FCRs by NYC Norton)

freefly103
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Joined: Wed Apr 17, 2013 1:50 am
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