How do you proceed to oil a noma electric shovel 1200

I didn't see a manual using Google to search. Canadian Tires sells it, and they have over 500 stores - so may be able to ask them for assistance.
Some positve but also some very negative reviews on Canadian Tire site:
https://www.canadiantire.ca/en/pdp/noma-oil-filled-heater-black-0435123p.html
One year exchange warranty at Canadian Tire stores.

Our two-cycle snow throwers use a 50:1 ratio of gasoline to 2-cycle oil. A 50:1 ratio is a mix consisting of 2.5 ounces of 2-cycle oil with 1 gallon of gasoline. NOTE: Always mix 2-cycle fuel oil and fuel in an approved gasoline safe container prior to filling the engine. Make sure to use a separate gas can for this 2 -cycle fuel ...

Try this site they have loads of Murray manuals listed. Murray took over Noma.. https://www.partsandservice.com/html/Murray/st

as it is electric it is not a job for diy
could be deteriorated insulation, vermin infestation(ants) or nay number of faults that when disturbed will cause a shock to a person not experienced in electrics
take it to an appliance repair shop for a proper diagnosis and test

Re. my problem with the NOMA EW7507CE, there is no power, no read-out, nothing. Tried different plug-ins, no evidence of power!

Timer is not identified.
Noma is a recognized brand name that is licensed to many different product manufacturers for a variety of different products including timers.
Check resources below:

1) Add a comment with clear description of timer, and/or post a photo on flickr and include link to photo

2) Open following link to see various Noma timers and download possible manual:
http://waterheatertimer.org/Woods-timers-and-manuals.html
http://waterheatertimer.org/images/NOMA-logo-1200.gif

3) If you have different product than a timer, for example an oil-burning radiator or electric baseboard heater then re-post question on fixya with clear description of product for possible research and information

Not without a good deal of machine work. You'll have to disassemble the entire engine and bolt the cases back together. The cases will have to be bored for the "spigot" of the new larger cylinders. I hope this helps.

Good Luck
Steve

Shovel head lifters tend to wear out. Check your adjustment first. Shovels also run on the warm side. Does it idle good? If not, check for intake leaks.

I would like to figure out out to program my NOMA photo electric switch Model Number N 1502