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1979 75hp Stinger PleaseHELP!!!!

S

Siniscta

Member
This has happenned the last couple of times I took my boat out last year. Boat ran great for a couple of hours off and on. Then all of a sudden boat would stall when I attempted to accelerate. It idled just fine and I could rev the motor using the throttle lever at the control box no problem. It's like I had to slowly inch the throttle and wait for the boat to catch up. When I did it normally it stalls. I'm not sure what's happening and I know a bunch of people are going to say carbs but if it were the carbs it would run like crap from the start. Right? This thing runs great at first then this happens...
 
Most motors will rev up fine in nuetral.----That means nothing to me.----Post compression numbers.----Check for water in the fuel.----Is timer base rotating properly ?---Strong spark on all 3 leads ?----Are head bolts tight ?----Any sign of water on plugs ?------The list goes on.
 
When did this problem start? Sounds like a lack of fuel. It would still run okay until you load it. Does it help to apply added fuel pressure with the squeeze bulb? Has it been run on ethanol fuel? Don't run for the hills, it should be a simple fix I think.
 
timguy said:
When did this problem start? Sounds like a lack of fuel. It would still run okay until you load it. Does it help to apply added fuel pressure with the squeeze bulb? Has it been run on ethanol fuel? Don't run for the hills, it should be a simple fix I think.
Click to expand...

It always happens after the boat has been running for awhile. Like at least an hour. Granted I’m turning motor off and on to use trolling motor. But boat runs awesome till it happens. Idles great, accelerates great. Then after awhile will idle fine but when I try to take off..... stalls! I’ll try squeezing the bulb next time but I live in Michigan and haven’t gotten on the water yet
 
Yeah, it's just getting nice here now too. Make sure the tank is getting properly vented too. As a maintenance thing, I use Amsoil Quik Shot once a season to clean fuel pump and carbs. Newer product from a company I know well and trust. It works well in all fuel systems including injection.
 
I'd have to second Joe on this one - a sticking timer base.

The same issue plagued me for a couple of seasons.

I'll expand a bit more though - the timer base is operating completely normally most of the time - so you can't check for the problem except for when you get the stalling issue out on the water. Someone on this forum told me I could just check for a sticking timer base at home - true in some circumstances, but not in this one.

Joe has posted a solution elsewhere if it is this issue - either slightly bending the timer base retainer clamps to allow a bit more movement, or to add thin washers under the clamp mount points, again, to give a bit more freedom.

The failure mechanism is that the engine is running at temp, and turned off. The water all drops out, and the residual heat spreads everywhere, causing the timer base to bind. Once restarted, it takes a little while for the block to cool down again, and free up the timer base.

I do a lot of water sports towing - and found sometimes I had this issue even from just idling after a tow - there just wasn't enough cooling water at idle to deal with a hot engine. Thin washers sorted this for me, however, I still occasionally get binding after a hot shutdown and probably need slightly thicker washers.

Nick.
 
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