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View Full Version : New Carb. Still rough idle??


SunCoast 83
04-25-2012, 04:35 PM
Hey guys. I just spent some$$$ to put an end to my ongoing carb issues. I just had the Holley Carb, fuel lines, fuel pump all replaced. In addition our dealer dumped the tank and I added fresh 93 octane gas and Stabil treatment

In running it today it's at about 98% great. It is still having a rough idle but faster speeds and hole shot are good. Is it possible that it may need to tweaked? Like the idle??

I am gonna meet someone from the dealer at the ramp next week. I hope this is it. Anyone else have a similar experience?

Jim@BAWS
04-25-2012, 07:46 PM
Is the timing set correctly? Should be 8 deg BDC
What plugs are you running? Champion RV12YC or AUTOLITE 24s
Are you running points and condensor or breakerless?

Are the bowls adjusted correctly for a motor that sits at a 12 deg slant?

These are all things you need to consider

Jim@BAWS

thatsmrmastercraft
04-25-2012, 09:32 PM
Is the timing set correctly? Should be 8 deg BDC
What plugs are you running? Champion RV12YC or AUTOLITE 24s
Are you running points and condensor or breakerless?

Are the bowls adjusted correctly for a motor that sits at a 12 deg slant?

These are all things you need to consider

Jim@BAWS

Especially good point most won't consider.

ALL the basics first. After that, it might need a little mixture screw adjustment.

Jim@BAWS
04-25-2012, 10:23 PM
Especially good point most won't consider.

ALL the basics first. After that, it might need a little mixture screw adjustment.

Moved again naturally

SunCoast 83
04-25-2012, 11:03 PM
I believe points not breakers. It has new plugs and wires too.
Our local dealer is supposed to meet me at the ramp next week.

I did not consider the slant degree of the engine block. I can pass that along too.

Thanks for the feedback so far I really appreciate it

SunCoast 83
04-25-2012, 11:09 PM
Jim,
It has Autolite Plugs in it.

SunCoast 83
04-25-2012, 11:21 PM
When putting in a new Carb, does it take a bit to work the bugs out of it??

waterlogged882
04-25-2012, 11:26 PM
..........

SunCoast 83
04-25-2012, 11:34 PM
Yes. It is a brand new 4160

I notice the rough idle only after it has warmed up. Running more than 20 min.

waterlogged882
04-25-2012, 11:36 PM
..........

petermegan
04-26-2012, 08:06 AM
Suncoast, I reckon if it is just when it warms up you will find the mixtures need a bit of a tweek. just my .02

east tx skier
04-26-2012, 10:09 AM
When I replaced mine on my old boat, the only thing I ever had to adjust was the idle. It was set at about 480. I brought it up to about 600 and it ran like a top.

Kyle
04-26-2012, 11:33 AM
Run the mixture screws in and count the rotation. Write the amount of turns it takes to seat the mixture screws down. Loosen the mixture screws 2 full turns.

360* turn is 1 rotation 180* is 1/2 rotation.

You may need to go to 2 1/2 rotations but mine did not.