Welcome to the Access Norton Forum. Login as a VIP member to remove the advertising banners.


74 Mk2 A getting it back on the road

Classic Norton Commando Motorcycles.

74 Mk2 A getting it back on the road

Postby N0rt0nelectr@ » Fri Aug 25, 2017 10:38 am

Well my new to me Mk2A is making progress. Just put a few miles on it after being laid up for over 20 years. Did a few miles on it last month but had shifting problems, took the outer cover and went to replace the hairpin shift spring. Found that the inner ratchet was seized to the outer shifter pawl carrier. Took well over an hour to free it and get the shifter assembly disassembled so I could replace the spring. Maybe I should have coated it with anti-seize. Didn't do much with the bike after that until today.
Took the bike out and she shifts easily but the shift lever needs a slight touch to return. Going to take it apart again over the weekend and see if I missed a spot of rust on the shaft that could be causing the problem. Might dig into my stash of stuff and find a complete shifter assembly and install that. It's always something isn't it.

John in Texas
Access Norton VIP Paying Member
N0rt0nelectr@
VIP MEMBER
Posts: 336
View Photo Album - Images: 7
Joined: Mon Sep 15, 2014 3:15 pm
Location: Texas & Arizona don't ask

Re: 74 Mk2 A getting it back on the road

Postby htown16 » Fri Aug 25, 2017 10:45 am

Has the original layshaft bearing been replaced?
Htown16
Magnolia, TX
1970 BSA Thunderbolt
1971 Commando
1972 Commando
1974 Commando
1978 T140E Bonneville
1974 Trident
2004 XL1200R Sportster
Access Norton VIP Paying Member
htown16
VIP MEMBER
Posts: 827
Joined: Wed Apr 29, 2009 6:15 pm
Location: Houston, TX

Re: 74 Mk2 A getting it back on the road

Postby NortonMKIIA850 » Fri Aug 25, 2017 11:02 am

I have the same bike, well, an Interstate anyway, and the same thing happened to me many years ago, despite the bike being in frequent use. You did well to separate those two parts, or maybe mine were more badly seized. I simply could not separate them, not with the gear I had available anyway, so I replaced them with new parts. Keep on keeping on with that beautiful machine!
User avatar

NortonMKIIA850
Posts: 155
Joined: Thu Jul 20, 2017 3:51 am
Location: UK

Re: 74 Mk2 A getting it back on the road

Postby rvich » Fri Aug 25, 2017 11:51 am

I recently experienced this. The bike stuck in second gear pulling away from a light. The two shafts stuck together was not on my list of probable causes. I live far enough north that I have difficulty getting my oils hot enough to drive out moisture. I switched to ATF in the gearbox to see if this helps. Mine cleaned up easily enough but there was emulsified oil and rust formed into a crud that prevented the two shafts from operating independently. I change my oil often but I guess I will pull and clean the shifter pawl occasionally. And all this time I thought the leaking oil would prevent that sort of thing!

Russ
"Just one sheep..."
Follow advice from this poster at your own risk!
User avatar
Access Norton VIP Paying Member
rvich
VIP MEMBER
Posts: 2468
Joined: Sat Jul 25, 2009 8:09 am
Location: Juneau, Alaska

Re: 74 Mk2 A getting it back on the road

Postby Torontonian » Sat Aug 26, 2017 6:51 am

Redline gearbox oil coats everything with itself and doesn't drip off so try it to prevent rusty sticking springs n' pawls inside the outer cover.
User avatar

Torontonian
Posts: 2792
Joined: Mon Dec 28, 2009 8:47 pm
Location: Toronto,Canada

Re: 74 Mk2 A getting it back on the road

Postby N0rt0nelectr@ » Sun Aug 27, 2017 5:12 am

rvich wrote:I recently experienced this. The bike stuck in second gear pulling away from a light. The two shafts stuck together was not on my list of probable causes. I live far enough north that I have difficulty getting my oils hot enough to drive out moisture. I switched to ATF in the gearbox to see if this helps. Mine cleaned up easily enough but there was emulsified oil and rust formed into a crud that prevented the two shafts from operating independently. I change my oil often but I guess I will pull and clean the shifter pawl occasionally. And all this time I thought the leaking oil would prevent that sort of thing!

Russ

Well I pulled the outer cover off and the shafts just fell apart so that wasn't the problem. I noticed that the clutch cable adjustment had gone was off in the short time I was riding it around the hood. Having been there years ago I opened up the primary again and re-torqued the main shaft nut holding the clutch on. Then did the same thing with the shift side. Replaced the clutch cable but I couldn't get the adjuster on the clutch to run up tight to the clutch rod before backing it off 1/2 to 3/4 of a turn. It has only a thread or two showing above the diaphragm spring. Yes the lever inside the outer cover is seated correctly. Need to check the stack height on the clutch and the length of the clutch push rod. The way it looks the stack height is to high or the push rod is to short which I doubt. It came with a Barnett Clutch and looking at it, but not measuring it, when I was re-assembling it was close to the top of the splines before I put the pressure plate on. Think that is where my issue lies.
And, no I haven't replaced the lay shaft bearing.

John in Texas
Access Norton VIP Paying Member
N0rt0nelectr@
VIP MEMBER
Posts: 336
View Photo Album - Images: 7
Joined: Mon Sep 15, 2014 3:15 pm
Location: Texas & Arizona don't ask

Re: 74 Mk2 A getting it back on the road

Postby grandpaul » Sun Aug 27, 2017 6:02 am

You are sure your inner clutch lever housing is screwed all the way in? Sounds like it might have tightened up before running all the way in to the bearing shoulder.
GrandPaul
author "Old Bikes"
too many bikes to list, including:
952 Prototype, MkIII Interstate, Combat Dunstall, Triton
User avatar
Access Norton VIP Paying Member
grandpaul
VIP MEMBER
Posts: 9743
View Photo Album - Images: 30
Joined: Tue Jan 15, 2008 1:11 pm
Location: Laredo (south) Texas

Re: 74 Mk2 A getting it back on the road

Postby N0rt0nelectr@ » Sun Aug 27, 2017 9:31 am

grandpaul wrote:You are sure your inner clutch lever housing is screwed all the way in? Sounds like it might have tightened up before running all the way in to the bearing shoulder.

Well it didn't rotate when I finished tightening it so I am pretty sure it is tight. I won't have time to open up the primary for about a week, getting ready for Davenport. I will take pictures when I do and let you all see what I see. I will pick up a 203NJ bearing so I can have that when I pull it apart.
Getting a bit wet here.

John in Texas
Access Norton VIP Paying Member
N0rt0nelectr@
VIP MEMBER
Posts: 336
View Photo Album - Images: 7
Joined: Mon Sep 15, 2014 3:15 pm
Location: Texas & Arizona don't ask

Re: 74 Mk2 A getting it back on the road

Postby htown16 » Sun Aug 27, 2017 1:08 pm

A 74 probably had the dreaded Portugese layshaft bearing. Mine did. If you got that much of the box apart, time to replace it with a roller. If it fails it locks the rear wheel and pulling the clutch in won't help.
Htown16
Magnolia, TX
1970 BSA Thunderbolt
1971 Commando
1972 Commando
1974 Commando
1978 T140E Bonneville
1974 Trident
2004 XL1200R Sportster
Access Norton VIP Paying Member
htown16
VIP MEMBER
Posts: 827
Joined: Wed Apr 29, 2009 6:15 pm
Location: Houston, TX

Re: 74 Mk2 A getting it back on the road

Postby Torontonian » Sun Aug 27, 2017 5:16 pm

Your model year most likely has the dreaded Portuguese bearing. It must be replaced. Lots of info on how to. :!:
User avatar

Torontonian
Posts: 2792
Joined: Mon Dec 28, 2009 8:47 pm
Location: Toronto,Canada

Re: 74 Mk2 A getting it back on the road

Postby N0rt0nelectr@ » Sat Sep 09, 2017 3:36 pm

Torontonian wrote:Your model year most likely has the dreaded Portuguese bearing. It must be replaced. Lots of info on how to. :!:


I have replaced the lay shaft bearings with the roller bearings on all of my other Commandos, I have 3. This one is new to me and I am still picking at it to make it mine if you know what I mean. 20 years off the road can do more damage than riding it every week for 20 years.

John in Texas
Access Norton VIP Paying Member
N0rt0nelectr@
VIP MEMBER
Posts: 336
View Photo Album - Images: 7
Joined: Mon Sep 15, 2014 3:15 pm
Location: Texas & Arizona don't ask

Re: 74 Mk2 A getting it back on the road

Postby rgrigutis » Sun Sep 10, 2017 4:48 pm

Check your primary chain tension. 3/8 hot in middle of run
heres to us and those like us

rgrigutis
Posts: 295
Joined: Sat Dec 27, 2008 5:05 pm
Location: southern indiana

Re: 74 Mk2 A getting it back on the road

Postby N0rt0nelectr@ » Tue Sep 12, 2017 11:27 am

rgrigutis wrote:Check your primary chain tension. 3/8 hot in middle of run

That is a good idea, I hadn't thought about that. Did a few more laps around the hood and the shifter still need a slight touch to get it to return.
Got a new roller lay shaft bearing that I plan to install before the NTNOA get together in Jefferson Texas the end of the month. I was thinking that there might be some rust on the shaft that located the shift forks which could hang up the shifter.
I hope I can get the old lay shaft bearing out without pulling the primary and gearbox. Report to follow.

John in Texas
Access Norton VIP Paying Member
N0rt0nelectr@
VIP MEMBER
Posts: 336
View Photo Album - Images: 7
Joined: Mon Sep 15, 2014 3:15 pm
Location: Texas & Arizona don't ask

Re: 74 Mk2 A getting it back on the road

Postby N0rt0nelectr@ » Sun Sep 17, 2017 1:46 pm

Well I spoke to the previous owner and he tells me he had replaced the lay shaft bearing with a roller one. One thing I won't have to deal with. Took the outer cover off the transmission and inspected the shifter parts. Didn't see anything until I went to put it all back together. Then I had my ah ha moment!
The pawl carrier was hitting the gear shift stop plate and I had to assemble them before putting them back in place. I had never run into this before. So I took it all back apart used my Dremel tool to grind off a little where the pawl carrier and the stop plate touched and my problem was solved.
Need to contact the previous owner and see if he remembers having that issue with the shifter hanging up.
Put 50 miles on it and plan to put more on tomorrow.

John in Texas
Access Norton VIP Paying Member
N0rt0nelectr@
VIP MEMBER
Posts: 336
View Photo Album - Images: 7
Joined: Mon Sep 15, 2014 3:15 pm
Location: Texas & Arizona don't ask


Return to Norton Commando Classic Motorcycles

Who is online

Users browsing this forum: 84ok and 5 guests