Originally Posted By: mikeg5
we have a Javelin bass boat. i think its a 1997 model. anyway it has a johnson venom 200hp on the rear and it smokes like a chimney.. i cant get to much info on it. i have read that they smoke like that and that its part of the beast but really i dont know.. any ideas? she runs pretty good and will fly if wings were attached. every now and then you get a little skipping when cruising between 30-40 mph it will radomly feel like the motor is skipping. we replaced plugs, fuel filter and is serviced every year or every other year. I had a 2000 Johnson 150 hp Ocean Pro. The carb mixture screws were fine pitch allowing one to really fine tune the idle mixture. Tuning six cylinders takes some practice. It you're not comfortable with this, don't touch it. People have cooked powerheads by shutting off idle circuits. Turn the mixture screw in slowly allowing the the change in mixture to travel to the cylinder. Stop when it starts to drop or skip. At that point back the screw out 1/4 turn. and go on to the next cylinder. If you can start the outboard when it's cool and don't need to hit the choke, you're likely too rich, and are wasting fuel. When leaned porperly, throttle response can be brutal. Find ONE oil and stick with it as changing oil can upset the calibration. Trust me! Now for the smoker! I have seen 150 hp, and smoke like crazy (OMC's) after they were run, shut down, and then re-started again. A knowledgable marine mechanic told me he thought it had to do with how the crank was oiled. Perhaps the crankcase is puddled with oil at shutdown. Skipping could be an overly rich cylinder (idle circuit)starting to fire as the carb throat starts to open, or a carb out of sync. The carbs on my 150 were two triple throats. It helped with the sync problem. Sorry about the mess. I didn't want to re-write after I found that I interrupted the script. Sooooooooooooo sorry. hope this helps.
could the skipping be the lower end? maybe its not leveled right at the speed its going?
also the smoke, what can be done? the (due to lack of terms) oil and fuel mix part was replaced 2 years ago. but it still smokes like crazy. any idea?