OMC Guru's---Dhadley, Walleyehead, anyone....

[vranasaurus]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

Originally posted by tysidor:<br /> Well I finally had time to check the timing. I tested it at WOT in the water. It looks to be very close to 28. Sometimes the light would blink slightly lower and sometimes slightly higher.

I have a thread going about my 90 and it seems to have the same problem as your motor. My light blinked like that when I had a timing light hooked up before. Shouldn't it blink at a constant rate when the throttle stays the same. Good it be a problem with electronics?

 

[tysidor]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

Basscat 1 -- All butterflies on carbs are wide open -- Timing linkage is hitting rubber stopper -- Timing set and verified at WOT on trailer in water -- Double checked all of my new fuel system, nothing is leaking, all fittings are tight, no kinks or bends to worry about<br /><br />As far as my timing light blinking slightly off. I really don't know if this should be a concern or not. Maybe someone else can verify. It would sometime blink between 26-30. Never lower then 26 and never higher then 30. I figured it was pretty close.

 

[walleyehed]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

Have you checked timing on #1 and #2?<br />Does your flywheel have markings for #1 and #2?<br />If it has markings for both, you need to check both positions and use the one showing the most advanced timing.

 

[Basscat 1]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

Originally posted by tysidor:<br />As far as my timing light blinking slightly off. I really don't know if this should be a concern or not. Maybe someone else can verify. It would sometime blink between 26-30. Never lower then 26 and never higher then 30. I figured it was pretty close. [/QB]

When this happens, does the engine rpm's fluctuate?

 

[tysidor]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

Walleyehed -- Yes, I checked timing on 1 and 2. They both looked about the same. <br /><br />BassCat -- If the rpms fluctuate it isn't noticable by ear or by the tach. So in other words if it does it would be very little.

 

[Basscat 1]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

You might check the flywheel key and make sure its good and tight and not worn.<br /><br />Have you tried running the boat at WOT with the engine cover off?<br /><br />Again, just turning over some stones.

 

[vranasaurus]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

Will it turn over 5k without a load?

 

[walleyehed]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

I hope you mean "will it turn over 5K without a load of people".....<br />vranasaurus, that's a good way to blow an engine to hell and back....NEVER run an outboard such as this over 2000RPM, no-load, NEVER!

 

[walleyehed]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

tysidor, I would strongly recommend at this point, that you take it to a dealer, let them put the test-wheel on and make sure it's developing the rated power.<br />We really have no consistant data to go by and we're shooting in the dark....we need a constant value here.

 

[tysidor]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

BassCat -- I have not checked the flywheel key. I can double check that to be sure. Yes, I have tried running at WOT with the engine cover off. It makes no difference. <br /><br />As far as running it at WOT without a load the closest to that I have come is when I backed it into the water on the trailer to set the timing. I backed it in just far enough so the AV plate was covered with water. With this amount of load it was turning 5800-5900. When I pumped the primer bulb it would jump upto 6200-6300. I forgot to mention this earlier sorry guys. So yes, it will rev there and it sounds very good there.

 

[tysidor]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

Walleyehed -- Maybe your right. This just may be over my head. I am sure some of you guys could troubleshoot it and figure it out right away. I just thought that maybe with some help I could get it fixed up. At this point I almost hate to spend any more money on it. <br /><br />What will it mean if it is or isn't reaching it's rated power? How will this help troubleshoot it?

 

[Basscat 1]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

When you said, "With this amount of load it was turning 5800-5900" I assume you had the boat in gear? No offense, just checking.<br /><br />What about high altitude jets? I dont know what the altitude is in Montana, but may you need to check that too.

 

[Blueclaw]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

New here but thought this thread seemed interesting.<br /><br />You say you are at 3,500 feet ASL. I'd think you'd have to rejet your carbs to get proper air/fuel mixture. Does the carbs have high speed adjustment screws on that year or are they fixed jets like the newer models? You would want to take it to a good two stroke mechanic to have it done. run too lean and goodbye cylinders<br /><br />Where did you buy the rig from? Was it used at that elevation prior to you buying it?

 

[walleyehed]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

we got some good wrenches here with high altitude set-ups, and yes, that can make a difference but I,m running sea-level jets in my V6 at almost 4000ft...when I get a bit more time on it, it will be leaned down 2 steps.<br />You can run about 1 deg farther advanced for every 2000ft. as well. I just don't think that's killing the power THAT much...

 

[tysidor]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

BassCat -- Yes, it was in gear. I was setting my timing at WOT this way. <br /><br />Altitude is about 3300 Feet.<br /><br />As far as the high altitude jet go. I have talked to every big marina in Montana and none of them change out the jets. They told me the differences are very little. <br /><br />My jets in my engine are also fixed jets, so I can't adjust them that way. The engine was bought from the local marina and has always operated at this altitude. <br /><br />Thanks again for all the replys and help.

 

[walleyehed]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

The marina is wrong....it does make a heck of a difference, it's just most don't want the liability of a melt-down.<br />We need to pull a main jet out, see what it is compared to what the sea-level jet is and go from there. It would be like a 62C or something along those lines...

 

[farginicehole]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

Hmmmmmm, I wonder if that's why my 150 is such a dog at WOT. . . .

 

[Basscat 1]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

Different size jets will make a difference. I would check them.

 

[tysidor]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

What should be my next step? Should I take it to a dealer, or check the flywheel and the jet sizes? <br /><br />The other big problem is that I really don't trust the local marina's.<br /><br />Any idea's why it was loading up and dieing the other day?

 

[walleyehed]

Re: OMC Guru's---Dhadley, Walleyehead, anyone....

Pull the bottom jet plug on the side of the carb bowl and use a jet screwdriver to extract the main jet. Get the number off of the side of the smooth part and we'll see what jets you have...<br />Loading up and dieing can be something as simple as too high a float level, or even a sticky timing arm in the low position....many things could cause that.