Guests - If You want access to member only forums on HSO. You will gain access only when you sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
kotadust

base settings specs for 1973 140 hp mercruiser

4 posts in this topic

Wondering if any one could help me out with the base settings or direct me to where I can find the base settings for a 1973 140 hp mercruiser for adjusting idle has a real rough idle right now and in the water once it is in gear it wont stay running at idle have to go to about 1/5 - 1/4 th throttle to keep it running (let me tell ya how much fun it is to try and get to the trailer and dock that way lol)

Share this post


Link to post
Share on other sites

Idle mixture starting point should be about 1 1/4- 1 1/2 turns from seat, point dwell 28-34 degrees, timing 6 degrees, idle in gear about 600. Use AC spark plugs. Tune up kits are cheap, if you havnt already done that.

I hope thats what you are looking for.

Share this post


Link to post
Share on other sites

biggest thing was the idle mix starting point point dwell unfortunatly I dont have the equipment to set that all i was able to do was set the gap with a feeler gauge and trying to find a timing light so I can get that done unfortunatly I dont know a whole lot of ppl up here yet lol and yes the info was very helpful thanks a million will help me to get moving in the right direction at least lol

Share this post


Link to post
Share on other sites

Setting the point gap to .022 will be close enough for it to run good. Setting the dwell will make it just that much smoother, so dont worry too much about that.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0