75searay240
New member
"Hello, I have been having pro
"Hello, I have been having problems with a 1975 mercruiser 233hp boat. Low idle would vary from 600 to 950 when cold and warm. Had top end of rpm of 3100 at a operating temp of 180. Could not get a smooth idle, so change plugs, wires cap, and rotor. Replaced filter in the rochester 2gc carb and cleaned with carb cleaner. Adjusted idle mixture screw, only one because I could not get the other one to turn at all, acheived vacume reading of 14 to 16. Got motor to idle fine, and took out for test and does not have enough power at top end. From what I can tell this is the original carb. Any way to adjust better for top end? Wanting to back fire also. Also vacume reading would drop to less than 6 after trying to power up. Another problem is that I have never been able to get the manufactures specs of wot 3800-4200 rpm. Just up to 3100 rpm with a 16X11p prop. Direct result to carb for a while? Any one have ideas or adjustments? Think I should have the carb rebuilt? Please help Thanks"
"Hello, I have been having problems with a 1975 mercruiser 233hp boat. Low idle would vary from 600 to 950 when cold and warm. Had top end of rpm of 3100 at a operating temp of 180. Could not get a smooth idle, so change plugs, wires cap, and rotor. Replaced filter in the rochester 2gc carb and cleaned with carb cleaner. Adjusted idle mixture screw, only one because I could not get the other one to turn at all, acheived vacume reading of 14 to 16. Got motor to idle fine, and took out for test and does not have enough power at top end. From what I can tell this is the original carb. Any way to adjust better for top end? Wanting to back fire also. Also vacume reading would drop to less than 6 after trying to power up. Another problem is that I have never been able to get the manufactures specs of wot 3800-4200 rpm. Just up to 3100 rpm with a 16X11p prop. Direct result to carb for a while? Any one have ideas or adjustments? Think I should have the carb rebuilt? Please help Thanks"