Heatsoak? but I'm also losing pressure!

[ericfebs]

Hi everyone,
i've been to my mechanic for a repair, which he can't fix. I do, however, seem to be paying him a lot to fix things not related to my problem...

I've got a 95+/- Evinrude 200 Oceanrunner/pro. Runs great to start. Runs great when I'm running along. Problem is, after I've been running for awhile, I can't idle without stalling. I check the primer ball and it goes soft often times when i get this problem. Many times, however, it is not soft. And, when I build the pressure back up by squeezing the ball, the problem persists.

Also, if I shut the motor down after running for some time, I can have real difficulties getting it going. Often times, it takes dozens of attempts to get the motor to do anything more than sputter. I typically would get a 'weak' idle and as soon as I add power, it stalls. i can't figure it out.

I don't see any gas leaks. The clamps and hoses are good into the VRO pump.

Could it be a bad check valve? maybe vacuum isn't good so the fuel falls back out of the motor? perhaps air leak within contributing to problem.

And another note, if i push the electronic choke/primer at the key switch, it will sometimes keep the motor idling, but sometimes it's not quite enough. and i don't think that would help when I go to give it power either.

Help! i can't slow troll for Kingfish running in my area and it's killing me!

Eric in Parrish, FL

 

[billybones]

Re: Heatsoak? but I'm also losing pressure!

Sure sounds like a lack of gas. If it were me I would take it out and when problem arrived I would have 2 things. a spray bottle with fuel. and a small tank with fuel and a new hose and bulb. I would try the spraybottle first in the carbs to see if that makes it start up. if it did temporarily at least. I would hook up small tank and see if problem goes away. This would narrow it to the tank or the motor side. HTH. EDIT Not sure if your running a premix or not. so make sure you have premixed fuel in the spray bottle.

 

[tashasdaddy]

Re: Heatsoak? but I'm also losing pressure!

sound like lack of fuel, what are your idle rpms set at, in the water and in gear? could be link n sinc, also check your neutral cutout switch, could be miss adjusted, and cutting out 1/2 the cylinders, when you slow. atleast i believe that one has the cutout for shifting.

 

[ericfebs]

Re: Heatsoak? but I'm also losing pressure!

I have the linkages check, i've got all new cables, new neutral safety switch, etc. The problem is the same problem many other evinrude owners are having with a motor of this vintage.

I know there is no problem in the tank--it was leaking last year and i ripped the deck out, put new tank in, etc. Hoses and connections are good into the motor.

Nobody seems to be able to solve my problem, or the problem others on this same forum are having. Do you think I could need a carb service???

 

[tashasdaddy]

Re: Heatsoak? but I'm also losing pressure!

the linc and sinc, is the synchronization of the spark and the carbs, it is a step by step procedure, and must be done correctly. when in doubt a carb rebuild is easy. this also has to be done right, or it is a waste of time and $$.
http://forums.iboats.com/showthread.php?t=244013

 

[Dhadley]

Re: Heatsoak? but I'm also losing pressure!

Lets start at the beginning. What spark plugs are you using and what grade of fuel?

BTW - a 1995 200 did not come with a VRO but rather the OMS pump.

 

[ezeke]

Re: Heatsoak? but I'm also losing pressure!

Couple of things: First is the way the motor works on a cold start is to advance the timing a few degrees. It's called QuikStart and it works great unless you rev the engine to 1100+ RPM before the engine warms up. Reaching 1100 RPM disables QuikStart. Let the engine reach 96 degrees F. and the timing reverts to normal as it should;.

If your thermostats don't work, your motor will never perform ideally at idle;

And, after your annual de-carbon treatment, you have to clean or replace your recirculation check valves. It is especially important if you troll a lot.

 

[gpetrilak]

Re: Heatsoak? but I'm also losing pressure!

I had the same problem with a 150 Johnson from the day it was new. After doing many of the things that have been suggested, my problem was that all the carb floats were way out of adjustment. Probably not your problem but easy to check.

 

[ericfebs]

Re: Heatsoak? but I'm also losing pressure!

Lets start at the beginning. What spark plugs are you using and what grade of fuel?

BTW - a 1995 200 did not come with a VRO but rather the OMS pump.

NGK plugs from local boat store. Just put them in this year. Had same problem with Champion plugs b4 change. Motor may be a 96, I'm not sure. It's definitely VRO pump.

 

[Dhadley]

Re: Heatsoak? but I'm also losing pressure!

First things first. We'll need to get some Champions back in there. I'd probably go with some QL77JC4's.

What grade fuel?

 

[ericfebs]

Re: Heatsoak? but I'm also losing pressure!

87, but i've run higher grade in there earlier to see if that was the prob. didn't matter when i put 93 in there--and i did that by accident one day. didn't pay attn at the pump.

 

[Dhadley]

Re: Heatsoak? but I'm also losing pressure!

We'll need to stay with 87.

OK, so we know we need to get Champions back in there and stay with 87 octane. Now, we're back to Ezeke's questions and suggestions about the t-stats and decarb.

 

[ericfebs]

Re: Heatsoak? but I'm also losing pressure!

Here's what I've resolved to do. If it works, I'm going to let every Evinrude owner know, because people with this motor have this problem:

1. I'm going to have the carbs serviced/rebuilt/cleaned by a pro
2. checking and replacing hoses and check vales in recirc system, as well as vacuums
3. sync carb & spark--which hopefully gets done when carbs redone
4. inspecting thermostats while at shop
5. testing electronic primer system

Let's hope that works. Evinrude mechanic says he can go over the whole thing and do carbs for $250. Seems like a good deal--especially considering all the other parts I've replaced over the last couple years.

 

[Dhadley]

Re: Heatsoak? but I'm also losing pressure!

I've had several of these motors, worked on more than I care to remember and had one that put out well over 300 hp. Every one will idle good and run consistantly if everything is working properly and as intended.

You have to start with the basics and work your way thru possibilities. Yes, there are things to look at that are specific to this motor.

Don't get discouraged, a good tech will get it fixed.

 

[Faztbullet]

Re: Heatsoak? but I'm also losing pressure!

Been tagging along following post..When the last time it had a impeller? What is the compression?? I myself am leaning to a temp problem and engine is expanding clearances when hot. (seal rings or pistons) this is a open deck block and will expand more than a closed deck. Also worn skirts on the pistons will cause fuel pump not to cycle correctly @ low speeds and cause carbs run out of fuel or lean.

 

[ericfebs]

Re: Heatsoak? but I'm also losing pressure!

Been tagging along following post..When the last time it had a impeller? What is the compression?? I myself am leaning to a temp problem and engine is expanding clearances when hot. (seal rings or pistons) this is a open deck block and will expand more than a closed deck. Also worn skirts on the pistons will cause fuel pump not to cycle correctly @ low speeds and cause carbs run out of fuel or lean.

I changed the impeller near the end of last season when i resealed the lower unit. I had it compression tested at the beginning of last season when I had some other work done and the mechanic was impressed with how good the compression was. The boat had been owned by a guy who used the boat very little over a 8 or 9 year period--and hardly at all until i bought it about 3 years ago.

I'm no mechanic, but rings, piston problems, etc. sound like it'll be time for a new motor if the problem isn't hoses, leaks or bad carbs....

 

[ericfebs]

Re: Heatsoak? but I'm also losing pressure!

Mechanic just called. He said carbs dont need to be redone. He ran boat hard on his dyno machine and couldn't find anything really wrong with it. said one of the carbs had something going on and wasn't getting gas, but he didn't find leaks, etc. Hopefully, his small fix will solve problem, i just doubt it...

 

[72SideWinderSS]

Re: Heatsoak? but I'm also losing pressure!

"He ran boat hard on his dyno machine and couldn't find anything really wrong with it. said one of the carbs had something going on and wasn't getting gas"

I would be looking for a new Mechanic. No Gas = No OIL ( Look Out Boys, She a Gona Blow )

 

[ericfebs]

Re: Heatsoak? but I'm also losing pressure!

no, he took the carbs off, cleaned & adjusted them, then ran the boat in his tank. i guess a roller was missing on the linkage to one of the carbs so it wasn't opening while the others were open.

taking out for a test 2morrow. we'll see how it goes....

 

[Nandy]

Re: Heatsoak? but I'm also losing pressure!

I guess it went well...