My old Merc 4hp 1990 started to exhaust gas (gas in the lake). There are no leaks anywhere. The local mechanic said it was a normal operation. Does anyone have an idea of the source of the problem?
Does it smoke very much? Is there an oily film on the water around the engine when operating in N? Do you run the engine at WOT very often? Do you troll a lot? Do you use synthetic blend (Pennzoil Super Premiun...for example) oil at a 1/2 pt to 3 gallons of gas ratio? Do you use Sea Foam in your fuel mix to keep your engine clean? Does the engine start and run strong?
All of these things have an effect on how clean your engine is and environmentally friendly.
Hi Mark and thank you for responding. The motor doesn't smoke, but there is a wide film in the water in neutral. I never troll. I operate at 50 to one oil mix. What does WOT mean and what do you mean by run strong?
Hi Mark and thank you for responding. The motor doesn't smoke, but there is a wide film in the water in neutral. I never troll. I operate at 50 to one oil mix. What does WOT mean and what do you mean by run strong?
Wot means wide open throttle I believe also know as100% throttle. Engine running strong I believe refers to: do you see or hear any hiccups or anything that might be indicating something's wrong
Wot is wide open throttle , your carb may be set a bit rich not all bad or you may have went with a cheap oil or put a little to much oil in the gas ?
Ken
Maybe your outboard spits out more gas than normal, maybe not. You should know that 2 stroke motors do spit out gas because there are no valves to prevent this from happening like there are on a 4 stroke. This is why the EPA is pushing manufacturers to go towards making all motors 4 strokes. I hope they never totally do away with new 2 strokes because they are lighter weight, more powerful out of the hole, and a lot simpler (easier to work on yourself).
WOT was answered. Run strong means that when you give her the throttle she takes it and moves on; no balking, hiccuping or any of that like weimed mentioned.
On leaning out the carb, if you decide to fool with the low speed jet, if you get it too far in...too lean, the engine won't run strong and you can have piston scuffing problems.
WOT was answered. Run strong means that when you give her the throttle she takes it and moves on; no balking, hiccuping or any of that like weimed mentioned.
On leaning out the carb, if you decide to fool with the low speed jet, if you get it too far in...too lean, the engine won't run strong and you can have piston scuffing problems.
Thanks guys. I find the motor spits unburned gas mainly, but not exclusively at startup. Full throttle is ok if I go at it gradually. Othewize, it dies.
Is there any tests I can do to diagnose the problem?
You should probably rebuild the carbs and fuel pump before you go back on the lake again. It's not normal to leave a gas slick, I don't care what the mechanic said.
Why would both fail at the same time? Is there any tests I can run to diagnose the issue? Can anyone explain to me how can unburned gas make it straight to the exhaust?
