Now going custom with alloy bodywork!!

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Re: 1974 Commando 850 Dunstall build.

the mounting of the dunstall seat is problematic. it needs the rear loop for support and a rear tie down point. you will either need to repair the loop or make up a different way to hold down the seat at the rear. also look at where it comes in contact with the frame at the front as you will need to pad the frame in that area also.

dave M said:
I was planning on having a standard Dunstall seat and also a single seat that I could swap as required. I might have to shorten the rear loop a bit, which is OK as it is already bent and butchered with welds for some touring luggage.
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Re: 1974 Commando 850 Dunstall build.

bill said:
it needs the rear loop for support and a rear tie down point. you will either need to repair the loop or make up a different way to hold down the seat at the rear.
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Windy's right about this. Without a rear tie-down the rear of the seat will flop up and down, continuously smacking the rear loop. Reason is that the seat is so long and with the rider perched right up against the tank, the rear is forced upwards. You need an "L" shaped hold down that fits under the rear loop to make it work....although another method could be devised I suppose.
 
Re: 1974 Commando 850 Dunstall build.

Cases painted same as barrel. I am making a centerstand, still in works, a winter priject. Once I get a working version, I will make copies and sell them. I will start a for sale thread when that happens.
 
Re: 1974 Commando 850 Dunstall build.

bwolfie said:
I purchased a chunk of bronze, and parted off what I needed. Now I have extra for other projects, 2 more commando motors for now.
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Are you refering to the swing arm bushes ? bronze doesn't really meet the low lubrication requirements like the oillite bushes
 
Re: 1974 Commando 850 Dunstall build.

No, for rocker arm spacers to eliminate the springs and washers. Swingarm bushings are cheaper than my time and material to make anyway.
 
Re: 1974 Commando 850 Dunstall build.

this is what happens when I only read bits of the story
 
Re: 1974 Commando 850 Dunstall build.

It is a long and winding story riddled with ADD :roll:
 
Re: 1974 Commando 850 Dunstall build.

I wont be removing the rear loop, simply shortening and tweaking it a bit to accommodate both seat pans, it's clear that there is a fair amount of support required at the rear of the Dunstall seat both for safety and practicality.
 
Re: 1974 Commando 850 Dunstall build.

dave M said:
cmessenk, make that triplets as I also have one under restoration, although thus far I have only built the engine and a few other ancillary components and collected most of th parts, however once I finish off one or two other bikes in my workshop I will start in earnest. I was planning on having a standard Dunstall seat and also a single seat that I could swap as required. I might have to shorten the rear loop a bit, which is OK as it is already bent and butchered with welds for some touring luggage. I'm still unsure whether to go with a drum or disc front end. I have a Triumph Twin leading shoe backing plate which will fit the Norton hub, but has a bit more available surface area on the brake shoes and will look fairly unique once I have modified it appropriately. My other option is a Norvil production racer disc with a larger caliper. I would of course love the Dunstall twin disc set-up, I gather they are rather inefficient although they do look the part. This post has been helpful and I look forward to posting some photos of my own in due course.
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The malicious roumour at the time , was that the Integral Dunstall calipers in the fork legs ( one casting ) heated
the damper fluid when used aggresively / raceing .Were erlier Strap On ones , look funny but heats isolated .

The 70 /74 Triumph Conical hub , Brake Backing plate , Uses Humber 80 (about 64) Brake Shoes . :shock: :?
So somebody :roll: ponders useing a Hydraulic Drum BraKe . Should be good if got right .
Cable brakes were used on BSA Lanchester Cars , but they were one of the last .
( a 72 BSA A65 & Humber 80 owner had a job in the brake relineing outfit . Er look at this .Look at this )
 
Re: 1974 Commando 850 Dunstall build.

Matt, fortunately the TLS backing plate is not of the 'comical' hub variety, but from the earlier pre-OIF models. I have seen this modification done before and it is reputed to offer better braking than a standard Commando unit and also looks nice. I will do this conversion anyway, but I'm unsure which of my numerous projects I will use it on.
 
Re: 1974 Commando 850 Dunstall build.

850cmndo said:
Did I read that you were building, or had built, your own centerstand for the 2-1-2 ? I'd be interested in seeing that and knowing how it mounts.
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Dunstall made a centre stand to go with the 2-1-2 exhaust, it simply had a loop to go around and clear the single exhaust pipe
 
Re: 1974 Commando 850 Dunstall build.

I have hundreds of pictures of dunstall parts I have collected over the years. From those I have been able to make some parts. The centerstand is going good so far.
 
Re: 1974 Commando 850 Dunstall build.

Bernhard said:
850cmndo said:
Did I read that you were building, or had built, your own centerstand for the 2-1-2 ? I'd be interested in seeing that and knowing how it mounts.
Click to expand...

Dunstall made a centre stand to go with the 2-1-2 exhaust, it simply had a loop to go around and clear the single exhaust pipe
Click to expand...

There's more to it than that. It also doesn't mount to the cradle. It mounts with plates to the engine and front iso mount. It mounts forward of the stock stand and doesn't lift the the rearend off the ground. If someone can configure one to mount and support the bike like stock, I wanna know cuz I'm running a Dunstall setup with the centerstand and it can be a pita.
 
Re: 1974 Commando 850 Dunstall build.

I'm making mine to mount in the stock location if possible.
 
Re: 1974 Commando 850 Dunstall build.

bwolfie said:
I have hundreds of pictures of dunstall parts I have collected over the years. From those I have been able to make some parts. The centerstand is going good so far.
Click to expand...

Keep us/ME posted regarding your centerstand. Also, don't know if you need the smaller mounting plates to fit those shorty mufflers. I have one off the bike you could use as a template.
 
Re: 1974 Commando 850 Dunstall build.

Now going custom with alloy bodywork!!


This is a Dunstall at Barber. We looked at the center stand for a while trying to figure out how it was mounted. This one had a bracket on the cradle that the stand mounted to. Very interesting.
 
Re: 1974 Commando 850 Dunstall build.

850cmndo said:
bwolfie said:
I have hundreds of pictures of dunstall parts I have collected over the years. From those I have been able to make some parts. The centerstand is going good so far.
Click to expand...

Keep us/ME posted regarding your centerstand. Also, don't know if you need the smaller mounting plates to fit those shorty mufflers. I have one off the bike you could use as a template.
Click to expand...

The plates I have look like they will work out prefect. Could you post a picture of the smaller plate next to a ruler?
 
Re: 1974 Commando 850 Dunstall build.

Does anyone have the kick lever pictured in swosh's latest picture, 2 panels above this response? Check out the length on that thing.

I recieved my rearsets today, 6 days from the UK, not bad.
Bolted them up, the shifter side is perfegt, the brake side needs a new rod made. I might go the aircraft cable route if my sources can help me.

Sitting on the bike they are comfortable with the clipons for my 5'10" frame. Looking forward to getting on the road.
 
Re: 1974 Commando 850 Dunstall build.

bwolfie said:
Does anyone have the kick lever pictured in swosh's latest picture, 2 panels above this response? Check out the length on that thing.
Click to expand...

Are you looking to purchase? I know where at least one is available...have had it in my hands.
 
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