Ok Merc issues

[macojoe]

CB


Ok BS came by today and just left. We found that one ck vale in the fuel pump was sticking so we changed it out, seems fine now.
There was no metal shavings of any kind on the pump screen so i guess they never got by the Racor.

We had a hose getting kinked some when the linkage was at wot and we fixed that also. We drained the bowls but did not do the test you said as I did not read this before hand.

Plugs are pretty dirty and replaced. The motor starts like a dream and idles fine!! BS felt the water and said I am good to go! I still hate how hot it is but everyone says its good then it must be!

When we had the carbs off before we cleaned the crap out of them and set the floats, and reinstalled, and since tere was nothing on the pump screen I am sure they are still that way, At least I hope so??

We really don't think its a fuel issue at this point?? But I have not put the boat in the water yet to see if anything we did today helps??
I will try to get out tomorrow to test it and see, I will also try your test to see if it is something there. When I came down to plane before it would clear up and when I gave it gas it would started immediately again.
But waited to start for a mile or so when it would first show up.

I am hoping it was something we fixed today?

[macojoe]

O yea only happens at high rpms, 4000 and above. when it happens I lose 1 to 500 rpms, mostly it starts losing 100 and goes to 500 as you go. I just give more gas to get them back up but still sputtering.

see what happens tomorrow? Thank

[THEFERMANATOR]

Does it eventually smooth out and sound like it has lost a cylinder? This sounds an awful lot like a fuel issue where your losing one cylinder. Although it could easily be a switchbox or stator issue. When it does it next time shut it down while it's doing it and go back and pull all of the plugs out. Look for the one that looks like it's not firing or out of the ordinary. If they all look uniform, but the problem is still there I would suspect the stator's high speed side. If one of your plugs looks really light in color then you know which carb to check. If one plug looks wet or fouled then check the ignion for that circuit. You need to isolate the problem so you know which are to address.

[macojoe]

Will do!! I changed all plugs today, so they are all new now, they were a bit oily and looked old?

This is a response I got from Iboats. I explained all just like I have done here, but I think this guy is wrong as I had this issue long before I went trolling for Tuna. I am going again by th way Wednesday!!

You simply have an oil overload.

When this occurs again, immediately pull the plugs and take a hard look at them. I'd be willing to bet that they are seriously oiled to the point that they will NOT fire under a heavy load such as put on the motor at 4500 RPM.

There is also an amount of pure oil in the recirc system, patiently waiting for engine speed to increase sufficiently to get it airborne and burnt off and let the spark plugs burn clean enough for the engine to get up to full power again.

The factory oiling systems lighten the oil mixture at low engine speeds to prevent this oil overload and hesitant throttle after long periods of idling and/or trolling.

Possible cures are;

1. install a small trolling motor and NOT idle the big motor

2. install spark plugs one-step hotter than the factory specified plugs (also, if piston clearance is adequate, change from surface gap to standard electrode or extended electrode plug)

3. if carb'd, readjust idle mixture to leanest idle possible and still not have any hesitation on rapid acceleration in gear.

[bigshrimpin]

MJ - I thought you hadn't run the boat since we went out around wings neck. There were two lil' hicups on take off, but it never hesitated or lost power during the 2 hour run (after we replaced the stator) . . . unless you dropped some roofies in my soda :) and missed something. I anxiously waiting for tomorrow update. Hope all goes well . . . if the Tuna are around . . . I going out this weekend.

Those plugs you showed me today were dripping two stroke motor oil :)

[macojoe]

BS you smoking anything??
I just told you I caught a Tuna last wed, and that I went for a ride in the boat Sunday, so how could the last time I took the boat out be in July with you??

[chumbucket]

He needs to open the door to the shop when he's test running those motors. Breathing too many fumes.

[bigshrimpin]

Originally Posted by macojoe

I think this guy is wrong as I had this issue "long before I went trolling for Tuna."

MJ????

Hey . . . did you get out today? I'm dying to know.

[macojoe]

I am leaving here at 4am, I can't wait!! A guy I know went today and they caught another 150 ponder out there today!

Also yesterday on the Chatam side they caught a 1200 ponder!!!! They say the big ones have been close and that there is at least five 700 ponders this past week!

[macojoe]

Well the bad news first, 6 footers out there wind and waves in are face, after 2 miles turned around and came back in, NO Tuna

Good news, came in and went out in a different area, drove boat about 15 miles at about 5000 rpm doing any were from 25 to 29 knots Opened it up and topped out at 33 knots, Motor never missed a beat!! Could have trimmed it a bit more and got another mile an hour??

So after putting new plugs, new ck vaule in the fuel pump, and redirecting the supply hoses to the carbs, it works! Not sure what fixed it??

Redistricting the fuel hose was like this, it had one supply hose from the pump, across the motor to the other side and that one hose went to top carb, then from there each carb feed off the one above.
Now there is a 3 way on the pump and a hose going to each carb direct.

So was it the hoses?? Ck Vale? plugs? or a combination of?

But it works!! Thanks all and to BS for stopping by to help me out!