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Go to the WeedEater website and you will find the info you want plus downloadable manuals.
Sears will have all the info.
you don't want one
Your rifle was made for Sears by Marlin, and is a model 336C.
Blue Book of Gun Values
The year, make, model and engine info would be helpful.
1920
Blue Book of Gun Values
Remington has never made a firearm with the model designation of 812
Info on the old Gilson tillers can be difficult. Toro owns the remnants of the company and can be very helpful.
That particular model was made in 1975. Put the model number in on google and you will find all the info you need on that motor
You need more info. some models are the same, so you can get a manuel for a more common model and use it for your model.