timing problem

[becoyote]

1982 Merc 115 inline six

Does 3 degrees make a difference at idle?

Set the idle timing at 6 atdc. Manual says 6-7 atdc.
Set the advance to 20btdc as per the manual

Problem is I had to turn the max. advance screw to the point that the idle stop screw no longer hits the stop and my timing at what is now my idle setting is 9 atdc instead of six.

Is this okay? I'm not seeing a way to bring the idle setting back down with out effecting the max advance.

butterflies seem to be fully closed in idle position and fully open in wot position.

Thanks

 

[becoyote]

Re: timing problem

I guess it is only 2 degrees out of the range in the manual (5-7) still is it right that the max advance changes the idle timing?

 

[Fuzzytbay]

Re: timing problem

Max advance does not change the idle timing. The two reference points, (timing) are for proper sycnronization. IE at the idle point the timing needs to be set for the spec. The max advance, is a stop point, preventing further advancing of the timing, irrelevent of throtle advancement. So, at idle you want the timing to be 6 atdc (seems wrong to me should be 6 Btdc). At 21 btdc you set the Max advance stop so the distributor, doesn't advance any more. The idle, is the low end, the max advance is the top end of timing. So the range is set at 6 atdc, and 21 btdc. You make this happen by syncing the carbs, and distributor. Here is a link to help you out.
You must make physical changes sometimes, bend the throtle tangs to get it all right.

 

[becoyote]

Re: timing problem

thanks,

advance screw was getting caught on a rubber bushing. Things make more sense in daylight:redface:

 

[Fuzzytbay]

Re: timing problem

Crap,,,,,,,,forgot the link
http://forums.iboats.com/showthread.php?t=168855