Greg Marsh Enterprises

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Special Parts
Updated 01/29/26

Master Switch Bracket
Updated 03/08/26

MKIII Rebuild
Updated 03/08/26

Combat 5
Updated 03/25/26

High Mileage Combat
Updated 03/24/26

High Performance 750
Updated 03/25/26

Roadster 850
Updated 03/05/26

Customer Combat
Partial Rebuild July 24

Delivered 03/22/25

850 Commando
Recommission

Delivered 09/20/24

Customer Combat
Build Oct 23

Shipped 7/13/24

1975 Norton Wiring
Delivered 06/07/24

Blue 69S
Delivered 05/17/24

High Mileage 850
Delivered 03/26/24

Mk3 Engine & Gearbox
Delivered 03/07/23

1973 Customer
BasketCase Build

Delivered 07/15/22

1974 Norton 850
Commando Rebuild

Sold 01/12/21
Updated 06/10/21


Customer Combat
Delivered 09/07/20
First Place Norton 05/18/2025


1972 Norton 750
Commando Rebuild

Completed 05/15/19
First Place Norton 05/16/19
Sold 01/01/20


1972 Norton Wiring
Completed 07/19/18

1974 Norton Wiring
Completed 07/27/20

Customer Combat
and 69S Builds

Closed 10/18/23

US FlagThursday, March 26, 2026
March 23, 2026 Last April a guy I knew died. His widow contacted me as he had a lot of bikes but she knew I did a lot with Norton Commando Combats. At the time, she did not have a clear title so the basket case she had was of no value to me. Fast forward a year and she called again, this time with a title. The last think I needed was another project, but...

She delivered the bike today. If it were just another Combat build, I wouldn't document it, but it is actually a 1973 High Performance 750 and it is going to be probably the worst/ugliest bike I've brought back to life. The Rebuild from hell had that distinction, but this is worse!

A little history: Later in 1972, the Combat had gotten such a bad name that Norton dropped it (more or less). By the time they did, the problem were resolved but they had already planned on the 850 to get more or less the power of the Combat bur with much less stress on the engine. they were still making 750s so they made two. One with an RH5 head which provided 8.9:1 compression and with a standard cam. they also made one with an RH6 head which provided 9.3:1 compression that was called a High Performance, but as far as I can tell, they never actually marketed it. The RH6 head was basically a RH5 head with .020: skimmed off. The Combat head (RH3) had .040" skimmed off and provided 10:1 compression. The Combat had a "2S" (hotter) cam. Not sure about the High Performance - will figure that out. This bike has a RH6 head so should be a High Performance. I will build it with a 4S came which is hotter than standard but nicer on the street at lower RPMs.

there are several bikes ahead of this in the queue so it won't get much in the way of updates for a while. I am out of space to it will come apart, lots of it recycled, and the rest in bins. However, I might use the frame for Combat5 if it's better than the frame I've been restoring for it. There are some pictures of it untouched since arriving today.

BTW, I'm open to names for this. I though about "Ugly One", "Ain't No Way", "You've Got to be Kidding me" and so on.
 
HP 750 Arrived 1
HP 750 Arrived 2
HP 750 Arrived 3
HP 750 Arrived 4

March 25, 2026 I had no plan to do anything with this right now, but then I had a guy stop buy with questions. In another write-up I told of a new shop rule and actually I have another (getting old so might as well become even more consentaneous). Here they are:
  • You put something away where it's doesn't go and the penalty is you lose a finger! You can put anything in my red roll-around cart and I'll put it away, just don't find your own spot!
  • You come to me for help, I'll drop everything and help you, but then you must plan on being put to work. In the past I never let people help, now I need free labor - especially for heavy things!
So, when I helped the guy that came today for 10-15 minutes, I put him to work helping me with this bike. First we moved things around and put it in a much better place where he could work on one side while I worked on the other. You can see in the picture that we got quite a bit done.

The reasons to take this apart are:
  1. Get rid of the junk and put the good parts in bins or shelves to save room
  2. Inspect the frame. the priority project right now is Combat5 and the frame I'm working on for it is in really rough shape. I think this frame is good other than the paint. I really would like to get that bike done this spring.
I suspect that in two more hours this can be apart and out of the way.

Taking aprts 1









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