1980 chryler 85hp charger tach replacement

[Guy707hc]

Hello Gentlemen, I am due for carb maintenance and would like to install a tach to do a thorough job. I had a 1971 70hp chrysler on the boat for many year before the #2 cylinder lodged half the piston in the exhaust ports.... so now with a (kinda) similar 1980 chrysler 85hp charger I want to adjust the carbs with a tach instead of guessing what rpm I'm idling at. I have a factory ignition on this outboard. I'm confused how many poles my tach needs ro read per count? Any help would be greatly appreciated. I love this motor as well as my older chrysler. Pleased with both, and I believe this charger motor has more in it with a proper tuning.

Thanks everyone

 

[Nordin]

Is the factory ignition system the battery driven Magna Power system with a distributor or the Prestolite CDI ignition without a distributor?
If the first one type of ignition system with a distributor you need to count how many poles the stator has.
I think it has 20 or 12 poles then you have to find a tach that can handle this.
You can use a simple LCD tach that has a wire which you wrap the wire some turns on the spark plug.
You find them out on the market at many web sites.

 

[topgun3690]

That engine has a distributor and a 12 pole stator.....just like my '78 85HP.....

 

[jerryjerry05]

Nordin and Topgun is right 12 pole.
Aftermarket tach might be hard to find.

 

[Guy707hc]

Thanks guys! Yes is has the distributor ignition and has not been converted to a coil yet. Counting the poles is the confusion for me.. I will study up on a few videos to learn. I would like a traditional tack. The digital universal tach isn't my favorite.

Thanks again already

 

[topgun3690]

Counting the poles is the confusion for me.. I would like a traditional tack.

This is a new stator for your motor......count the poles all the way around.....there are 12 on this one.

For a traditional dash mounted tach I got mine from Faria Beede website. I also got a Tiny Tach on ebay just to verify rpms were correct......and they are handy to have when working on small engines.......

 

[topgun3690]

For a traditional dash mounted tach I got mine from Faria Beede website.

Need to clarify this statement......I found the tach I wanted on the Faria website but they don't sell them on there. You have to find a dealer or look on amazon, ebay, etc. Iboats supposedly sells them, but I couldn't find any when I looked. FYI.....

 

[Guy707hc]

I was able to confirm the stator has 12 poles last night. I ordered a generic digital tach from ebay to get me by till I find the traditional dash mount I like the best. I will pull the carbs this weekend to check float height, clean thoroughly, new fuel stops, seats, and gaskets. Thanks again everyone! I will have it back in the water for the fall walleye bite here in northern Indiana!