13-05-2019, 11:59 AM
AN is the richest followed by EB and weakest is GG, if you have an AN start with this. Sounds like the EB was close but to get mid range mixture right the main jet was lower than ideal for idle mixture, hence the reason it fouled plugs trying to get out of Autokana. With the AN being slightly richer you will be able to maintain the midrange mixture but with a leaner idle if that makes sense. People seem to get very confused about SU needles, remember almost all .90 jet needles have the same diameter at idle, set the jet for correct mixture here, if it is lean or rich anywhere else DO NOT alter the main jet to compensate choose a different needle. If you alter the main jet you will simply stuff up the mixture elsewhere along the needles range and performance will suffer as a result. It is hard selecting needles unless you have experience and a lot of alternative profiles to choose from, using a proven needle such as the AN is a good starting point but even so this may not be ideal in your car.
Black Art Enthusiast