390 Ignition timing

Reply Subscribe

Thread Tools

Search this Thread

Mar 4, 2011 | 05:40 PM

#16

bad_behavior

Thread Starter

New User

Joined: Feb 2011

Posts: 8

Likes: 0

Sorry for taking so long to get back with you guys, been a bit busy. Well the float took care of the problem. I can drive around, shut her off, then fire her right back up with the turn of the key. Now I am assuming I need to adjust the carburetor because I can hear a faint popping in the exhaust at idle. Now here is how I will do it, so please tell me if I am wrong.

1. I will slightly seat the mixture screws, then back them out 2 1/4 turns.

2. Start the truck and let warm up to operating temperature.

3. Set the idle speed at 650 RPM

4. One mixture screw at a time I will back out till engine RPM raises, then screw back in counting turns till engine starts to run rough, then back the screw back out half as many turns. So 4 turns in would mean 2 turns out. Repeat with the other mixture screw.

5. Set idle speed back to 650.

Well, this is how I have always heard how you adjust a carburetor, so am I right? Thanks for the help.