atlas engine compatible parts with 750 commando

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84ok said:
year atlas? part # for Commando decompression baseplate maybe? or more info?
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My Atlas is 1962. I'll have to check with Ashley at Andover Norton when they open after the holiday. He had a batch of these base plates specially made, of which I had the first one, to overcome the semi obscuring of the oil return hole.
 
84ok said:
from the very first link & a search of - atlas barrels

on the 15th result of the search titled - sleeving down a squish band
https://www.accessnorton.com/NortonCommando/sleeving-down-a-squish-band.23596/

a confirmation of a commando head on (non?) spigot (removed?) atlas barrel
(i thought the ring was for atlas heads that are made to fit a spigot barrel, but that can be modified to fit a flat surface, dunno why a commando head would need a ring)

https://www.accessnorton.com/NortonCommando/sleeving-down-a-squish-band.23596/#post-348093



this link lndicates
http://atlanticgreen.com/nhth.htm


https://www.accessnorton.com/NortonCommando/cylinder-head-for-spigotted-barrells.22319/#post-332745
atlas engine compatible parts with 750 commando


then
atlas engine compatible parts with 750 commando


flat barrel head
atlas engine compatible parts with 750 commando
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THIS 25319 head is a late Atlas type.
 
If I was fitting an Atlas engine into a Commando, I would not bother to change the balance factor. A Commando was never going to be as smooth as a CB750 Honda, regardless of what was done to it. With the higher factor you would simply live with a bit of vibration, low down in the rev range. But at high revs, it would probably be better than with the low factor.
 
Danno said:
I once transplanted an Atlas bottom end into a Commando for the rear ignition drive, which I converted to a K2F mag. Went right in.
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I have considered doing this what did it start like with the magneto ?
 
acotrel said:
If I was fitting an Atlas engine into a Commando, I would not bother to change the balance factor. A Commando was never going to be as smooth as a CB750 Honda, regardless of what was done to it. With the higher factor you would simply live with a bit of vibration, low down in the rev range. But at high revs, it would probably be better than with the low factor.
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They tried an atlas engine with the standard balance Al it didn't work IE it moved the vibration forward and aft I believe
A commando is smoother than a CB 750 honda once it's above 2300 rpm
 
baz said:
I have considered doing this what did it start like with the magneto ?
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I could never get it to run the same on both cylinders. Apparently the mag had a bent shaft. Starting was definitely not a problem. Plenty of hot spark.
 
comnoz said:
Pistons are interchangable but Atlas pistons are cupped for low compression.

Atlas con rods are not as strong near the small end as Commando rods are.

The timing gears would fit in a later Commando if the camshaft and sprocket, spindle and cover were changed also.
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@comnoz Is the sump plug the same for the Atlas and 850 Commando?
 
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