Originally Posted by Gotthebug
About to tune my twin weber 48 IDF's on a 2276 engine.
Looking for advice as to what readings I should get on the carb balancer and other general advice.
STRONG smell of petrol after use and can smell fuel when running - maybe running too rich??? How can I tell when the mixture is right?
Reason for checking carbs is I'm getting popping/banging from exhaust when I back of from accelerating. Engine pulls fine but need to stop the pop!
Best way to get it sorted is booked into a rolling road as the other jetting may be incorrect. But at home
Start the engine and let it idle. Then tighten the mixture screw, all the way until the engine starts to cough, you should hear it drop in RPM. Then turn out slowly until it picks up and runs smooth you want it where its running the best, you will be able to hear when its right. If you carry on backing the screw out it will run poor again so find that sweet spot inbetween. Repeat this for all of the mixture screws one at a time. Try and count how many full turns it takes for it to run best as this will give you a indicator if your idle jets are too small or large
Once you are happy with the mixture screws, you can readjust your idle
You can pull your spark plugs and have a look at the ends and that will give you a indication if your running rich