470 mercrusier idle problems

R

rudderless

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Aug 6, 2009
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I have a fresh rebilt merc 470 with a new carb and pertronix ignition sys I have statically timed the eng for 10 deg ( 8 called for ) crab is set at 1 1/4 mixture it has an electric choke set at 5/16 the eng runs but I can not get the idle down past 12/1300 rpm in order to fine tune without it stalling out gas is fresh plugs/wires,coil new. yes there is a resistor wire eng runs ok above 1500rpm smooth but not below could this issue be caused by the electronic ignition sys does anyone have a wiring diagram for this sys any help would be great cheers
 
S

stonyloam

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Mar 13, 2009
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Re: 470 mercrusier idle problems

The "book" says 4 degrees BTDC for the points engine (don't know about the electronic ignition). I tried the pertronix in my 470, never could get it to work right, went back to points, kept the flamethrower coil, and never looked back:D. Good luck with yours.
 
R

rudderless

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Re: 470 mercrusier idle problems

Yes I am thinking of going back to the points sys can you tell me what the gap should be I do not have a manuel thanks
 
S

stonyloam

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Re: 470 mercrusier idle problems

I couldn't get mine to start with the pertronix:mad:.

Points gap: 0.022
Dwell: 28-34 degrees
timing: 4 degrees BTDC

Good luck.
 
Don S

Don S

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Re: 470 mercrusier idle problems

rudderless said:
Yes I am thinking of going back to the points sys can you tell me what the gap should be I do not have a manuel thanks
Click to expand...

Why don't you go up to the adults only sticky at the top of this forum and cure that problem?
 
R

rudderless

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Aug 6, 2009
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Re: 470 mercrusier idle problems

I removed the pertronix ignition sys problem FIXED runs great now thanks for the help
 
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