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1971 Norton Commando Rebuild Thread

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Re: 1971 Norton Commando Rebuild Thread

Postby grandpaul » Mon Apr 04, 2016 5:08 am

That sure is shiny! Almost there, and just in time for peak riding season.
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Re: 1971 Norton Commando Rebuild Thread

Postby nortriubuell » Mon Apr 25, 2016 12:37 pm

Nice job Jerry, and I luvs all the cool pics :D Thanks for posting. Cheers.
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Re: 1971 Norton Commando Rebuild Thread

Postby Jerry Doe » Wed May 25, 2016 4:07 pm

My 750 is finished and I now have just over 400 miles on it. It runs very well.

I want to say thanks to everyone for parts and services:

Thanks to Jim Comstock for taking care on the head. Jim rebuilt the original head with 1.5 mm over valves, up graded springs, porting etc. Also welded a broken fin back on and tumbled it. I think he skimmed it 10 thou. Jim also supplied a webcam 12 and radiused the lifters.

Thanks to Brent Budgor for doing the panels and tank. The tank is an Emgo and good quality. The side panels from eBay. I will be doing a separate write up / review on Brents work later.

Thanks to Matt fro many things of which some i will probably forget:
-Repairing broken cases, tumbling. Polishing cases, providing super blends.
- Front brake and handlebars.
- Single coil ignition and tri-spark.
- Hydraulic clutch (Jim too).
- Head steady (Jim too).
- Oil tank modification.
- Breather mod.
There is more, but i cant remember.

Thanks to Rocky Point Cycle, Bill for my stainless parts.

Also, RGM, OC powder coating & plating, Castillo balancing....

The bike performs really well. I am still running it in at about 400 miles now. I had a hard to find oil leak, and have nailed that. The bike started first kick. I had an old exhaust on it for the first few hundred miles. The motor seemed a bit flat mid range. I was going to buy some Andover peashooters and then Matt from cNw said he would lend me a set of his prototype peashooters for an hones review. I put them on last week and love them mid range is there now. I will write about these separetly. I will be giving these back to him at the end of the summer and he is sending the new ones. I am using Les Harris headers or down pipes. I painted the inside of the headers with high temp paint and they did not discolor. So that works!

Head work was described above. Carbs are Amals standard for a combat motor and jetting is perfect for the exhausts. Manifolds are 32x30.

Cylinders are powder coated. Pistons are Hepolite.

Crank is standard and was balanced to 60 percent dry. Polished rods, new shells as crank was ground.

Webcam 12 with radiused followers. Thanks again Jim.

Superblends. Cases modified by cNw for the breather mod.

Gearbox is orginal shells, everything inside is now. I have a dual adjuster.

Primary has a 3 phase alternator and RGM belt drive, with clutch stack from cNw. I added a pushrod seal from Dave. O ring chain drive with 20 tooth countershaft sprocket.

I purchased the wheels from member here and rebuilt the hubs. They are 19 inch, so i am running AM26 tires, which i like.

Fenders/ mudguards are powder coated. Front is original and rear i had laying around.

Many new parts from RGM and a lot of stuff garage that i had.

I will have to write some more here about performance later after i take it for a serious blat. From what i can tell so far, it handles better than my mk3 and i think it will be faster, but not sure as my mk3 goes very well. It sounds great and am really enjoying riding.

Here are some photos:
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You can see all the images in my gallery here: http://www.accessnorton.com/gallery/album.php?album_id=89

I will be doing a few other write ups in the near future regarding performance and challenges I had during this restoration etc.
1975 MK3 Norton Commando
1971 Norton Commando
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Re: 1971 Norton Commando Rebuild Thread

Postby Danno » Wed May 25, 2016 4:54 pm

Great job! How do you decide which one to ride?
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Re: 1971 Norton Commando Rebuild Thread

Postby Jerry Doe » Wed May 25, 2016 8:22 pm

I am into the 750 now. The MK3 now needs some maintenance on it. I have never owned 2 commandos before. I am thinking for freeway riding then the Mk3 is best and if i am heading towards the mountains the 750 would be the choice.
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Re: 1971 Norton Commando Rebuild Thread

Postby gortnipper » Wed May 25, 2016 9:04 pm

Very nice. You didnt end up with those pricey switches, eh?
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Re: 1971 Norton Commando Rebuild Thread

Postby Jerry Doe » Wed May 25, 2016 9:09 pm

I am using the handlebar switches Matt sells. I only have a switch on the left. Turn signals, high/ low. Horn. Actually i dont care about horn. The horn switch is set to my digital trip meter in the digital smiths speedo. Headlight on off is in the headlight shell. I dont need a kill switch. I think that originally those switches might be honda. They work well and look good. I am all about reliability.
1975 MK3 Norton Commando
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Re: 1971 Norton Commando Rebuild Thread

Postby Fast Eddie » Wed May 25, 2016 11:06 pm

Jerry, stunning build sir!

Did you go with the Combat head in the end? Did it get any porting work etc from sir Comnoz?

And what compression ratio are you running, I'm interested to know how the Comp ratio / cam / follower combo you're using works as a package.
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Re: 1971 Norton Commando Rebuild Thread

Postby gortnipper » Thu May 26, 2016 12:05 am

Jerry Doe wrote:I am using the handlebar switches Matt sells. I only have a switch on the left. Turn signals, high/ low. Horn. Actually i dont care about horn. The horn switch is set to my digital trip meter in the digital smiths speedo. Headlight on off is in the headlight shell. I dont need a kill switch. I think that originally those switches might be honda. They work well and look good. I am all about reliability.


They are Honda. His web site said as much as one point.
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Re: 1971 Norton Commando Rebuild Thread

Postby grandpaul » Thu May 26, 2016 6:10 am

Two stunning beauties.
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Re: 1971 Norton Commando Rebuild Thread

Postby Jerry Doe » Thu May 26, 2016 7:01 am

Hi Eddie,

It is the standard head with 30 MM intakes. I am using 32mm combat jetted Amal carbs on 32 x 30 intakes. Jim skimmed the head 10 thou, ported it and lightened the rockers. He used upgraded springs (not sure what type- Jim?). It has Kibble valves that are 1.5 mm larger. I used Kibble lightweight pushrods. Jim Radiused the followers and I have a webcam #12 grind in.

I don't know what the compression is. All I can say is that everything is just right.

Cheers
1975 MK3 Norton Commando
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Re: 1971 Norton Commando Rebuild Thread

Postby Fast Eddie » Thu May 26, 2016 7:35 am

Jerry Doe wrote:Hi Eddie,

It is the standard head with 30 MM intakes. I am using 32mm combat jetted Amal carbs on 32 x 30 intakes. Jim skimmed the head 10 thou, ported it and lightened the rockers. He used upgraded springs (not sure what type- Jim?). It has Kibble valves that are 1.5 mm larger. I used Kibble lightweight pushrods. Jim Radiused the followers and I have a webcam #12 grind in.

I don't know what the compression is. All I can say is that everything is just right.

Cheers


Thanks Jerry. Sounds like a perfect 'street-able' set up sir.

Both bikes look splendid, but I still can't quite forgive you for reneging on the best Commando paint scheme ever...!
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Re: 1971 Norton Commando Rebuild Thread

Postby Mr.Sparks » Tue Jun 07, 2016 5:17 am

Nice pair Jerry, lovely work, sounds like a good combo for the engine.
Mk3 x 3 and a Wideline Frame now. Electric starts are only a fad, tell my right knee that!
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Re: 1971 Norton Commando Rebuild Thread

Postby MichaelB » Wed Jun 15, 2016 11:25 am

Very, very nice Jerry.
Nothing less than we all expected.

Couple of Q's.
1. What did you do to the innards of the forks?
2. What's with the electrical/box switch assembly? Custom??
Ride hard, or stay home.
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Re: 1971 Norton Commando Rebuild Thread

Postby Jerry Doe » Wed Jun 15, 2016 9:12 pm

Hi Mike,

I used ally RGM dampers with better damping, new bushes and original springs. They work very well.

If you are asking about the ignition switch, i got it from JP Cyles. Its a simple 2 wire. I made a bracket or new carb back plate and bent it back on the left side. I had to get an ignition switch that would fit there. I have shorai and podtronics running + earth and an LED fuse box. Is that too much info? Lol

Cheers
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