countryboy26047
Petty Officer 1st Class
- Joined
- May 25, 2012
- Messages
- 303
....and using a few choice words directed at it lol... So here's the deal, I consider myself to be pretty competent when it comes to engines, and even though this is the biggest 2-stroke I've worked on, I've gotten it pretty well down.... or so I thought...
Anyhow, here's the deal, I've used my boat, which has a '75 merc 850 4cyl., to do a good bit of trolling, as well as some higher rpm cruising (typically when cruising I'm running in the 2-2500 range, with the occasional 5-10 min of WOT). Up until this past friday morning, I have been able to troll around 600-700rpm's for hours on end with no issues at all...actually surprised me how well this thing runs when doing this... Anyhow, this past friday morning I took my two oldest boys out to teach them how to troll. We was running for about 45min. when my oldest boy say's "Hey dad, your motor is smoking".. I turned around and noticed the tell-tale bluish/white smoke that goes along with a 2-stroke that's loading up.. it ended up that it started smoking so bad (also she started stinking pretty badly) that we all reeled in, and I was able to raise the throttle up to 1500, then 2k rpm's with just a second or two of hesitation when I first started opening it up. Ran it around 2k for a minute or two, then idled it back down to 650... an hour later, same deal...
After I got her home, I pulled the plugs (installed new plugs when I got the boat back in April) and they looked fine.. not wet, burnt..nothing. Checked spark on all plugs and it appeared to be just as strong as it's been since new plugs put in. I also have checked my carb settings and they are set exactly where I've had them since I re-adjusted them a couple months ago. I'm using the same gas from the same station, as well as the same exact mixture out of the same gallon jug of oil I've had for the last 5-6 tanks of gas run through. What else is there that could be causing this sort of issue?? I also should add that me and buddy went out and fished friday night, until 5am, and it did the same thing so we ended up just anchoring.
Anyhow, here's the deal, I've used my boat, which has a '75 merc 850 4cyl., to do a good bit of trolling, as well as some higher rpm cruising (typically when cruising I'm running in the 2-2500 range, with the occasional 5-10 min of WOT). Up until this past friday morning, I have been able to troll around 600-700rpm's for hours on end with no issues at all...actually surprised me how well this thing runs when doing this... Anyhow, this past friday morning I took my two oldest boys out to teach them how to troll. We was running for about 45min. when my oldest boy say's "Hey dad, your motor is smoking".. I turned around and noticed the tell-tale bluish/white smoke that goes along with a 2-stroke that's loading up.. it ended up that it started smoking so bad (also she started stinking pretty badly) that we all reeled in, and I was able to raise the throttle up to 1500, then 2k rpm's with just a second or two of hesitation when I first started opening it up. Ran it around 2k for a minute or two, then idled it back down to 650... an hour later, same deal...
After I got her home, I pulled the plugs (installed new plugs when I got the boat back in April) and they looked fine.. not wet, burnt..nothing. Checked spark on all plugs and it appeared to be just as strong as it's been since new plugs put in. I also have checked my carb settings and they are set exactly where I've had them since I re-adjusted them a couple months ago. I'm using the same gas from the same station, as well as the same exact mixture out of the same gallon jug of oil I've had for the last 5-6 tanks of gas run through. What else is there that could be causing this sort of issue?? I also should add that me and buddy went out and fished friday night, until 5am, and it did the same thing so we ended up just anchoring.
