BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
JWood Auctions JRC Engineering dealers JWood Auctions
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Member Spotlight
trevinoz
trevinoz
newcastle australia
Posts: 903
Joined: July 2006
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
14 registered members (Alan_nc), 173 guests, and 104 spiders.
Key: Admin, Global Mod, Mod
Newest Members
DennisMartin, Dwight V, urbanghost, Richard313, Gordo
10385 Registered Users
Top Posters(30 Days)
NickL 97
Mori55 82
Stuart 81
Rohan 80
Triless 79
reverb 78
DavidP 74
btour 66
Popular Topics(Views)
690,050 mail-order LSR
Forum Statistics
Forums34
Topics68,037
Posts661,964
Members10,385
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate Thread
looking at a 75 850 #747930
09/04/18 10:31 pm
09/04/18 10:31 pm
Joined: Jan 2012
Posts: 437
Western NY
P
Pete Suchawreck Offline OP
BritBike Forum member
Pete Suchawreck  Offline OP
BritBike Forum member
P

Joined: Jan 2012
Posts: 437
Western NY
Hi all, contemplating a 75 850, Owner says 29,000 miles, everything works including the starter. Some small paint problems original paint , red.
original mufflers, etc. Said the bore was recently honed, new rings. Valves need to be re-adjusted. He said he will take $4200.
I'm not familiar with Nortons-what should I look for and what are thoughts on the 75's in general?
I have a Triumph 750 along with other vintage bikes.
Thanks, Pete

Support Your #1 BritBike Forum!

Check out British motorcycles for sale:
British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America
Check out British motorcycles for sale:
British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America
Re: looking at a 75 850 [Re: Pete Suchawreck] #747959
09/05/18 7:30 am
09/05/18 7:30 am
Joined: Aug 2001
Posts: 2,226
Oztralia
R
Rohan Offline
BritBike Forum member
Rohan  Offline
BritBike Forum member
R

Joined: Aug 2001
Posts: 2,226
Oztralia
One of the known problems with the Mk3 was that some of them seem to have had soft cams - so if it needs the 'valves adjusting', this might be an indication that all is not well in this dept ?
Other possible problems with Commandos are the usual worn swingarm bushes, soggy rear dampers, worn isolastic rubbers, and rubber components in general, worn seals in the brakes, and general wear and tear.

At that price, if that was here, that price is a pretty good deal.
You could spend a handful of cash, and have a good Norton.
Its not that difficult to do all the work yourself even.
And, it may have been well kept and a genuine mileage, and quite rideable already.

The electric start later Mk3 is one of the more sought after models too.
Let us know how it goes.

Re: looking at a 75 850 [Re: Rohan] #747971
09/05/18 11:44 am
09/05/18 11:44 am
Joined: Jan 2012
Posts: 437
Western NY
P
Pete Suchawreck Offline OP
BritBike Forum member
Pete Suchawreck  Offline OP
BritBike Forum member
P

Joined: Jan 2012
Posts: 437
Western NY
Thanks for the info Rohan. The owner said the valves need adjustment because he had had honed the cylinders but not gotten to adjusting the valves before getting hurt.
He did say he had a rebuild kit for the front brake.
My understanding is the stock starter is weak. I see some alternatives such as the 4 brush starter and a modified Japanese starter.

Re: looking at a 75 850 [Re: Rohan] #747973
09/05/18 11:49 am
09/05/18 11:49 am
Joined: Nov 2003
Posts: 739
Orlando fla/ shady valley Tn
B
bill50cal Offline
BritBike Forum member
bill50cal  Offline
BritBike Forum member
B

Joined: Nov 2003
Posts: 739
Orlando fla/ shady valley Tn
the swingarm bushes almost never wear but the cradle does and that is where 99% of them have a loose swingarm at. this was corrected on the MK111 cradle

Originally Posted by Rohan

Other possible problems with Commandos are the usual worn swingarm bushes,


windy
72 combat
switchbackcreek.com
Re: looking at a 75 850 [Re: Pete Suchawreck] #748045
09/05/18 11:06 pm
09/05/18 11:06 pm
Joined: Aug 2001
Posts: 2,226
Oztralia
R
Rohan Offline
BritBike Forum member
Rohan  Offline
BritBike Forum member
R

Joined: Aug 2001
Posts: 2,226
Oztralia
You are probably right, I've heard of that.
But I replaced the bushes in a used Mk1 that I had, they were decidedly loose and a shade or 2 oval.
The OIL in there needs to be kept topped up, greasing them is death...

Good that the owner says its just adjustment needed for the valves.
Keep a watch that the clearance(s) don't need continual adjustment though.

There is a lot of chitchat about upgrading the starter. I've not had one...


Re: looking at a 75 850 [Re: Rohan] #748160
09/06/18 7:56 pm
09/06/18 7:56 pm
Joined: Jan 2012
Posts: 437
Western NY
P
Pete Suchawreck Offline OP
BritBike Forum member
Pete Suchawreck  Offline OP
BritBike Forum member
P

Joined: Jan 2012
Posts: 437
Western NY
Well I'm looking at it tomorrow so we shall see. Thanks for the input-pictures if I buy it.

Re: looking at a 75 850 [Re: Pete Suchawreck] #748654
09/10/18 8:34 pm
09/10/18 8:34 pm
Joined: Jan 2012
Posts: 437
Western NY
P
Pete Suchawreck Offline OP
BritBike Forum member
Pete Suchawreck  Offline OP
BritBike Forum member
P

Joined: Jan 2012
Posts: 437
Western NY
Brought it home. Guy had 15 cats and it was in his living room...the stench!!
Had a loose rocker clearance with the adjuster all the way in so we pulled the head and cylinder.
Cam and followers are perfect, loose exhaust valve guide, other sloppy. replacing the valve springs, guides, and exhaust valves.
The cylinder was just honed, new rings, good pistons. Bike is mostly original including the mufflers. Except for the cats it is clean
Starter works, I have lights and spark. Lucas RITA ignition.
The head gets dropped off tomorrow for the valve guides.

Re: looking at a 75 850 [Re: Pete Suchawreck] #748663
09/10/18 8:56 pm
09/10/18 8:56 pm
Joined: Dec 2013
Posts: 4,297
ohio, usa
kevin roberts Offline
fefsa
kevin roberts  Offline
fefsa

Joined: Dec 2013
Posts: 4,297
ohio, usa
i've never thought my norton commando was stinky.


"Are bikes so nice as all that?" asked the mole, shyly...

"Nice? They're the only thing," said the Water Rat Solemnly, as he leaned forward on the handlebars. "Believe me, my young friend, there is nothing -- absolutely nothing -- half so much worth doing as simply messing about with bikes."
Re: looking at a 75 850 [Re: Pete Suchawreck] #748666
09/10/18 9:00 pm
09/10/18 9:00 pm
Joined: Feb 2008
Posts: 4,458
New Jersey USA
Tridentman Offline

BritBike Forum member
Tridentman  Offline

BritBike Forum member

Joined: Feb 2008
Posts: 4,458
New Jersey USA
Kevin--they say that you can never smell your own hole.

Re: looking at a 75 850 [Re: Pete Suchawreck] #748683
09/10/18 10:36 pm
09/10/18 10:36 pm
Joined: Oct 2012
Posts: 3,935
Running from demons in WNY
Hillbilly bike Offline
BritBike Forum member
Hillbilly bike  Offline
BritBike Forum member

Joined: Oct 2012
Posts: 3,935
Running from demons in WNY
I rode with Pete to look at the Commando...It was a creaky old house and it did reek of cat urine.. The bike owner was disabled somewhat from a work accident 10 years ago...He mentioned taking a massive doses of morphine and oxycotin daily,..The floor was sagging , cats were giving us the stink eye,there were smaller unusual bikes scattered around all had something important missing....Like we had timed jumped onto a Fellini film...The bike was a good deal for the price ..We moved some junk out of the way and ramped the bike from a hallway , out the door into Pete's truck...While on the ramp being handled by Pete and me.the tire slipped sideways and the bike leaned over and the doped up guy flew like a flash over to help...he said he did an extra dose of morphine just encase he had to help...We got something to eat, day dreamed about the waitress, got gas a half hour later and the bike still smelled like cat urine...But every thing the guy said about the bike seemed true...


I ride dinosaurs....
Re: looking at a 75 850 [Re: Pete Suchawreck] #748686
09/10/18 11:00 pm
09/10/18 11:00 pm
Joined: Aug 2001
Posts: 2,226
Oztralia
R
Rohan Offline
BritBike Forum member
Rohan  Offline
BritBike Forum member
R

Joined: Aug 2001
Posts: 2,226
Oztralia
After such an epic tale, we gunna get a pic !?

Re: looking at a 75 850 [Re: Hillbilly bike] #748689
09/10/18 11:06 pm
09/10/18 11:06 pm
Joined: Aug 2014
Posts: 1,678
OZ
Triless Online content
BritBike Forum member
Triless  Online Content
BritBike Forum member

Joined: Aug 2014
Posts: 1,678
OZ
Apparently, pre MK3 gearbox cradles were prone to wear in the swingarm pivot area. Maybe this place was the inspiration for the Harry Chapin song. Pete should check that area in case the cats have been in it !

Re: looking at a 75 850 [Re: Triless] #748772
09/11/18 2:28 pm
09/11/18 2:28 pm
Joined: Jan 2012
Posts: 437
Western NY
P
Pete Suchawreck Offline OP
BritBike Forum member
Pete Suchawreck  Offline OP
BritBike Forum member
P

Joined: Jan 2012
Posts: 437
Western NY
I have to upload pics to a server before i can post. The bike has spark-cleaned the damn thing three times and it still smells a little. One valve had excessive clearance so we pulled the head and cylinders. Cams and followers beautiful, head not so much.

Re: looking at a 75 850 [Re: Tridentman] #748776
09/11/18 2:47 pm
09/11/18 2:47 pm
Joined: Dec 2013
Posts: 4,297
ohio, usa
kevin roberts Offline
fefsa
kevin roberts  Offline
fefsa

Joined: Dec 2013
Posts: 4,297
ohio, usa
Originally Posted by Tridentman
Kevin--they say that you can never smell your own hole.


richard, there are so many disturbing possible replies to that observation that i'm going to just let it alone.


"Are bikes so nice as all that?" asked the mole, shyly...

"Nice? They're the only thing," said the Water Rat Solemnly, as he leaned forward on the handlebars. "Believe me, my young friend, there is nothing -- absolutely nothing -- half so much worth doing as simply messing about with bikes."
Re: looking at a 75 850 [Re: Pete Suchawreck] #748783
09/11/18 4:01 pm
09/11/18 4:01 pm
Joined: Jan 2012
Posts: 437
Western NY
P
Pete Suchawreck Offline OP
BritBike Forum member
Pete Suchawreck  Offline OP
BritBike Forum member
P

Joined: Jan 2012
Posts: 437
Western NY
Tony and I pulled the valves out-the intakes are good, exhausts are burnt.. One exhaust guide was wobbling in the head. At the machine shop now to replace the valve guides then new springs and exhaust valves. Pushrods look fine too.

Re: looking at a 75 850 [Re: Pete Suchawreck] #748874
09/12/18 2:10 pm
09/12/18 2:10 pm
Joined: Jan 2012
Posts: 437
Western NY
P
Pete Suchawreck Offline OP
BritBike Forum member
Pete Suchawreck  Offline OP
BritBike Forum member
P

Joined: Jan 2012
Posts: 437
Western NY
[Linked Image]
Here she is pre teardown

Re: looking at a 75 850 [Re: Pete Suchawreck] #749027
09/13/18 1:41 pm
09/13/18 1:41 pm
Joined: Aug 2005
Posts: 1,492
melbourne florida
B
bodine031 Offline
BritBike Forum member
bodine031  Offline
BritBike Forum member
B

Joined: Aug 2005
Posts: 1,492
melbourne florida
Heavy doses of Fa-Breeze!!! Nice score

The shop that's doing the guides I hope know's WTF he's doing. Not to recut the seats to deep or face the valves so u can shave with them. Installed spring height springs get loose as the valves get sunk deeper into the seat

Re: looking at a 75 850 [Re: bodine031] #749104
09/14/18 3:23 am
09/14/18 3:23 am
Joined: Jan 2012
Posts: 437
Western NY
P
Pete Suchawreck Offline OP
BritBike Forum member
Pete Suchawreck  Offline OP
BritBike Forum member
P

Joined: Jan 2012
Posts: 437
Western NY
Thanks! The shop comes recommended. Owner has a '75 as well. I will have to shim the springs to the correct height,first time I've had to do that.
Got a front brake upgrade for it. Rotator cuff surgery in a week so she'll be sitting for a bit-me too.

Re: looking at a 75 850 [Re: Pete Suchawreck] #749106
09/14/18 3:38 am
09/14/18 3:38 am
Joined: Dec 2013
Posts: 4,297
ohio, usa
kevin roberts Offline
fefsa
kevin roberts  Offline
fefsa

Joined: Dec 2013
Posts: 4,297
ohio, usa
bulllshit, peter. just tell your body you won't stand for it.

when i was 16 i broke a metacarpal in my first-ever motorcycle wreck. they put me in a rigid splint, but i couldn't twist the throttle anymore, so i broke the splint in two at the wrist.

now i have fond memories of my teenage years every time i look at my bent hand.


"Are bikes so nice as all that?" asked the mole, shyly...

"Nice? They're the only thing," said the Water Rat Solemnly, as he leaned forward on the handlebars. "Believe me, my young friend, there is nothing -- absolutely nothing -- half so much worth doing as simply messing about with bikes."

Moderated by  Dave Comeau 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.6.2