Weber DCOE 40, 45 DCNF IDF. Are you suffering from carburetor setting?
Please input engine displacement and maximum horsepower speed. Display the appropriate choke size and jets type.

Notice:
Reciprocating engine only. Not use for MAZDA Rotary engine.
If the displayed choke size is different from the choke size of your car, please change the maximum horsepower speed until it is the same as the choke size of your car.
please change the mainjet oversize 5 or 10 if your car installed race camshaft, airhorn, or season of winter .
If it was very lean setting your engine will bloken.