07-17-2006, 11:42 PM
Start at factory settings. Since it is already broke-in, you can start tuning right away. Start tuning ONLY on the High speed needle. Only make amall adjustments (1/10 turn at a time). Give a couple passes at full throttle, to clear the engine and see how it is reacting. Watch for a steadt trail of smoke. It will be faint, but as long as there is smoke, it is good. Each time you turn the HSN, you should notice a slight increase in performance. When the engine seems to be shifting into 2nd gear in 10-15 feet, you are probably in a close range. Keep an eye on the temps also. If you have a friend that has a handheld temp gun, check with that as well, and see if your on-board guage is reading acurate.
After the HSN is tuned, you can start to tune the Low Speed Needle. A good starting point for the LSN, is to make a couple full speed passes to clear out the carb. When you pull the truck in, let it idle for a couple seconds, then pinch the fuel line about 1" from the carb inlet. The RPM's should rise slightly, and the engine should die in 3-4 seconds. If it takes 5 seconds or longer, it is a bit too Rich on the LSN. If it dies in 2 seconds or less, it is too lean. Once you get the LSN in that range, you should be pretty close.
Start the truck again, and make a few full throttle passes, to make sure it is cleared out, then bring the truck to a stop. Let it idle for 5-10 seconds. It should idle fine for this length of time. Then give it full throttle. the truck should take off pretty quick. If it sputters as it tries to accelerate, then starts to go, or sputters and dies at idle in the 5-10 seconds, slightly lean the LSN (1/10 turn at a time). If the RPM's start to rise and the truck dies out at idle in the 5-10 seconds, it is too lean on the LSN.
If it won't idle at all, slightly raise your idle speed, till it will idle, but not high enough to move the truck.
Good luck.
After the HSN is tuned, you can start to tune the Low Speed Needle. A good starting point for the LSN, is to make a couple full speed passes to clear out the carb. When you pull the truck in, let it idle for a couple seconds, then pinch the fuel line about 1" from the carb inlet. The RPM's should rise slightly, and the engine should die in 3-4 seconds. If it takes 5 seconds or longer, it is a bit too Rich on the LSN. If it dies in 2 seconds or less, it is too lean. Once you get the LSN in that range, you should be pretty close.
Start the truck again, and make a few full throttle passes, to make sure it is cleared out, then bring the truck to a stop. Let it idle for 5-10 seconds. It should idle fine for this length of time. Then give it full throttle. the truck should take off pretty quick. If it sputters as it tries to accelerate, then starts to go, or sputters and dies at idle in the 5-10 seconds, slightly lean the LSN (1/10 turn at a time). If the RPM's start to rise and the truck dies out at idle in the 5-10 seconds, it is too lean on the LSN.
If it won't idle at all, slightly raise your idle speed, till it will idle, but not high enough to move the truck.
Good luck.
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