Mitch's 72 Basket Case

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Looking good, I too prefer the silver cylinders. My 850 was black, but I went with silver, looks better that way.
 
If those piston oiling slots are connected by long thin slots half way around the circumference near the lower ring land, REPLACE THEM!!!
 
grandpaul said:
If those piston oiling slots are connected by long thin slots half way around the circumference near the lower ring land, REPLACE THEM!!!
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Remove the rings and post picture of pistons.
 
htown16 said:
The cylinders have been cleaned up and painted. I thought all Combat and later bikes had black cylinders but these had little bits of silver paint on them. I prefer the silver anyway.
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Standard tune '72 models would have had silver barrels, so did most '73 750/850 models as the factory attempted to distance itself from the black barrel "Combat" fiasco.

http://www.etmoteur.fr/norton_catalogue_commando.htm
Mitch's 72 Basket Case


http://www.classicbike.biz/Norton/Broch ... LineUp.pdf
 
The piston are the short slot type but they are getting replaced anyway. Not sure how they occurred but there were gouge marks around the crown and on the skirt. Perhaps from a previous decarbon job?
 
htown16 said:
The piston are the short slot type but they are getting replaced anyway. Not sure how they occurred but there were gouge marks around the crown and on the skirt. Perhaps from a previous decarbon job?
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Or something got loose in there.
 
This is the short slot type that was in the engine. Note the damage around the crown. There is also some damage on the skirt.
Mitch's 72 Basket Case
 
More garage time
Crank back together with new hardware
Mitch's 72 Basket Case

New big end bearings and rods back on
Mitch's 72 Basket Case

Crankcases back together with a coat of Hondabond in between
Mitch's 72 Basket Case
 
I doubt if this one makes it to New Ulm, but I am planning on riding the 70 Thunderbolt I just finished.
 
Progress report
New vernier adjusters for the isolastics
Mitch's 72 Basket Case

Timing side put back together and engine and gear box installed back in the frame
Mitch's 72 Basket Case

Primary side
Mitch's 72 Basket Case

Seemed like a good time to install oil filter and lines
Mitch's 72 Basket Case

New bushings for swing arm
Mitch's 72 Basket Case

Swing arm reinstalled with new shocks and hardware
Mitch's 72 Basket Case

Next project is to get the rear wheel back together and make a roller out of it.
 
You DEFINITELY picked the right time to plumb the oil filter!

Looking good.
 
Progress report time.
Rear wheel and brake reassembled and installed.
Mitch's 72 Basket Case

Cylinders back from machinist with a +.040 overbore and honed. New pistons and rings ready to go in.
Mitch's 72 Basket Case

Checking ring gaps
Mitch's 72 Basket Case

Did the method of putting the pistons in the cylinders on the bench and then dropping over the rods and installing pins. Doing a semi-dry assembly, Just a few drops of oil smeared on the piston skirts.
Mitch's 72 Basket Case

Barrel all snugged down
Mitch's 72 Basket Case

Next project is getting the head all reassembled and back on.
 
I'm NOT going to be the one to say he will have to take it all apart to put the horn in :mrgreen:

Jean
 
I haven't put the battery tray in yet. Looks like you need to bolt the horn to it first before it goes in. Am I missing something?
 
Yeah, but then you've got to reach in there and push the wiring on it.

Dave
69S
 
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