By the description I'll guess what you're experiencing is a "backfire". This happens when the timing in the engine is off for whatever reason. When this happens the intake valve is not yet closed when the spark plug fires. The air/fuel mixture is ignited and the burning / expanding mixture goes back up the intake manifold to the carburetor with a loud bang.
Inspect and clean your distributor and give your ignition system the once over. Set your timing and it should take care of the problem. If not then the engine has other issues that are more involved to go over here.
If the engine that came with it is in it, it's a 1600cc dual-port engine with a 34mm Solex carburetor.
The 1975 regular Beetle windshield will fit the 1971 Super Beetle.
If you look at the front suspension of any beetle you can tell if it is a super or non-super beetle. If there is a McPherson front suspension then it is a super beetle. If there is a torsion bar front suspension then it is a non-super beetle.
The super beetle was not put into production until 1971, there is no such vehicle as a 1964 super beetle.
“looking to see if the 72 VW I own is a Beetle or Super Beetle? VIN # 1122369336”
S&S Super E Carb Carburetor
A Super Beetle with a manual transmission has four forward gears and one reverse. A Super Beetle with an Autostick transmission has three forward and one reverse.
Keihin 40mm "Butterfly"type Carburetor.
1973 standard and super beetle
The VW Super Beetle is one of the rarest
navagate me thru a 72 super beetle interior
The super beetle has a different front end, having Macpherson struts. The apron, fenders and hood are styled different. The standard beetle has the torsion bar front end.