Thread: how to adjust quadrajet

( post 6 of 8) i can tell you that the secondaries are opening. the boat is responsive and seems to run strong, but when i went out the other day, i didnt see over 4500. before the head swap she would push 4900 at wot. there is one screw under the choke linkage but it doesnt look like a adjustment needle.    Report this post to a moderator | IP: Logged |

( post 4 of 8) The only thing you can richen and lean with a screw is the idle mixture... is that what you're referring to?    Report this post to a moderator | IP: Logged |

( post 5 of 8) Idle mixture screws wont affect anything other than idle. Are you sure the secondaries are opening all the way at wot?    Report this post to a moderator | IP: Logged |

( post 7 of 8) If I may.... First I'd say you need to get the timing set properly. Was this Quad running well before the head swap? Okay if you then decide to richen it up a bit, do you want to richen the cruize speed or wide open throttle? Gotta read the plugs. Cruz or economy rather can be adjusted on the later model Quads from the top. You know where the gasket that seals the air cleaner to the carb. Right in front of the choke horn...

( post 8 of 8) This may sound like a dumb question to you, but,just a thought , You said you put on new heads,,, but exactly what kind of new heads???...are you Sure their better than what you took off, ??? and is it the same intake or different?? This could also be another issue, possibly even spark related... just throwing out some ideas out here other than the carb.. If your not familiar with the Quadrajet to begin with, I would just toss...

( post 3 of 8) Wish I could help Silverstang, but...........I usually start with removing them and tossing them overboard!! I am sure there has to be someone on here that can guide you in the right direction!!    Report this post to a moderator | IP: Logged |