'o1 Merc 200 2 stroke engine issues

[Foreverstrung]

I've got a '01 Mercury 200 salt water, carbed 2 stroke. The last couple times out I was only at about 60% power. 28 MPH full throttle. should be 45 MPH full throttle. Have not started it for 2 weeks and today it would not spark at all. Checked primer bulb and gas was flowing though bulb never got hard. New plugs 3 months ago. Rebuilt carbs and fuel pump as well.
Could it be the fuel lines cracked and getting air? How would I check and locate this possible damaged area? If so, why would I not get any spark? Some gas appeared to be getting to the motor.
appreciate ya

 

[Foreverstrung]

Re: 'o1 Merc 200 2 stroke engine issues

Well I went out there today and confirmed I had spark. I'm still not real sure how to check for compression. Never the less, I checked the fuel lines. Hadn't been started in 2 weeks or so and it's been hot as sin here in Texas. The primer bulb wasn't gettin firm so I checked my filter and fuel lines, check valves etc. I think there may have been some blockage in the fuel line between the tank and primer bulb. Disconnecting the primer bulb and pumping it straight from the tank, I was getting little to no gas. I put a hand pump on it and it started flowing. Hooked it back up and it started pretty nice. Let it idle for a half hour or so as I tidied up and decided to take it out and open her up. She stalled 10 minutes out. Sounded rough. Started up again and headed back, (never did get to open her up), stalled again. Started again, sluggishly both times and limped home. My tank is low, I'll go out tomarrow with a portable tank and see what happens.
If this is the idle/start issue, which I believe it is, great. But I still expect to be at 60% power or so. I do need to check the switch pack, but checking for spark as I turn it over is a 2 man job right? Unless someone has a way they would care to share. Also, How do I check the compression

 

[hebby]

Re: 'o1 Merc 200 2 stroke engine issues

You can check with one of these or get a loaner from an auto parts store.
http://www.harborfreight.com/quick-connect-compression-tester-95187.html
Look for even compression in all cylinders. If one is way off that is where your problem is.

 

[Foreverstrung]

Re: 'o1 Merc 200 2 stroke engine issues

I'm not sure of the firing order, but 4 of the 6 cylinders had 60 PSI and the 2 furthast aft, on the motor, left and right, measured 70 PSI. (I pulled all 6 plugs out and checked the compression one cylinder at a time). I didn't have the right tool to measure the spark, but while idleing, all six plug wires, when removed from the plug, one at a time, gave a nice audible "clicking". Very bright out today. Couldn't see the spark, but I could hear it. Ran it off a porable tank. Dueched the carburater jets with carb cleaner. Put her all back together and let her idle for a half hour or so again. Took her out and on the bay, top speed was only 28 MPH, should be closer to 40 MPH. She stalled. Took about 3 minutes to start her back up and just took her home nice and easy with no issues. Didn't open her up again, but she ran at about 5 MPH with a steady purr, but very reluctantant to hit the gas. Does it sound like I might have run some foul gas through the carbs? Maybe let it sit too long, (gas in carbs and fuel lines)? Appreciate the help[

 

[Dave1027]

Re: 'o1 Merc 200 2 stroke engine issues

Did you happen to check the condition of the primer bulb when it stalled?

 

[Foreverstrung]

Re: 'o1 Merc 200 2 stroke engine issues

The primer bulb appears to be in working order, but I'm about ready to just put in all new 3/8" tubing and primer bulb. As far as the compression check went, I had Someone else asked about "Throttle wide open", when doing the compression check. The manual for the Morse shifter/throttle says there is a a safety button in the center of the handle which allows throttle without engaging the gears. Used for warming up etc. I'll go run the compression check again this afternoon with this new knowledge and report back. Appreciate the help. Sorry for the appearence of "Stupid". Gotta start somewhere I suppose.

 

[Dukedog]

Re: 'o1 Merc 200 2 stroke engine issues

Open or closed, hot or cold. Won't make that much difference. Numbers 1,3,5 top to bottom, starboard side. 2,4,6 port. 60 and 70 lbs are just about HALF of what it needs ta be on a healthy motor...............Needs ta be crankin 300+ rpm ta get a good reading.

 

[Dave1027]

Re: 'o1 Merc 200 2 stroke engine issues

The primer bulb appears to be in working order,

What I meant was, was the primer bulb still pumped up full of gas when it stalled? If it was collasped that would indicate some kind of blockage upstream like fuel tank not venting. If it was full of gas did you try pumping it to either keep the motor running or to restart it? If that helped then I'd suspect the fuel pump.