582 wont start

by Michael Regan in General Tech Discussion 13 years ago

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Re: 582 wont start

by Michael Regan » 13 years ago

Michael Regan

5 96 0

Hi Rog,

Ok, I will see what I can find, but I don't really know enough about it to troubleshoot the problem. I guess I get a lame to look at it. Thanks Roger for pointing me in the right direction.

mike

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Re: 582 wont start

by bill martin » 13 years ago

bill martin

10 757 0

Mike,

When you check the mags, does the engine sound like like its dropping more on one mag than the other. Try it without looking at the tach and see if they sound about the same. I know that the Grand Rapids EIS will sometimes indicate a false drastic drop on one mag; sometimes all the way to zero. They even mention in their instructions that this will sometimes happen. If you know someone with a tinytach or any temporary tach you could hook on the plug wire, you could double check the mag drop.

Two cycles will sometimes hunt a little at cruise but usually not more than 50 rpm in either direction. You might want to check the carbs for calibration. At idle, both slides should be the same height. As you advance the throttle, both slides should begin to move upward simultaneously. Check the idle air screw to see that they are both out the same amount (usually one turn). Are the EGTs about the same at cruise? Mine are usually within 15f of each other. A large difference could indicate a too rich or too lean condition in one carb. Air leaks such as a split carb boot can cause a carb to run lean. Are the needle jets the same number and are the needles both the same height. A needle that is set too high can cause a rich mixture. You might want to tear down the carbs, clean them up and make sure the settings are the same in both. Check the fuel filter for trash and the fuel pump pulse line for leaks. Both can cause erratic fuel flow.

582s are gas hogs! 4.5 gph at 5800rpm is actually pretty good.

Bill.

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Re: 582 wont start

by Michael Regan » 13 years ago

Michael Regan

5 96 0

Thanks Bill...alot there to discuss, so here we go....

When you check the mags, does the engine sound like like its dropping more on one mag than the other. ...... Most definitely mate. It sounds a bit sick actually.

Two cycles will sometimes hunt a little at cruise but usually not more than 50 rpm in either direction....This varies 3-400rpm

Are the EGTs about the same at cruise? Mine are usually within 15f of each other. ... Yes, the seem very close to each other

582s are gas hogs! 4.5 gph at 5800rpm is actually pretty good.... Sheesh, that's disgusting. My old EA81 was 15hp more and only used 14lph. The weight is the issue with the 582 though. I am told a lot of work is required to change to an EA81 in the Avid flyer I have because of the difference in weight.

Thanks again Bill...I will complete the other checks you mention over the next week or two.

Cheers...mike

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Re: 582 wont start

by bill martin » 13 years ago

bill martin

10 757 0

Mike,

Since the EGTs are pretty close to each other, I would guess that your carbs are pretty well balanced. You might take a look at the plugs. one bad plug can cause the type of mag drop you are having. One easy check will verify or eliminate a plug problem. reverse the position of the plugs in each cylinder (not the plug wires; just the plugs). Keep them in the same cylinder but just switch their position. If the big RPM drop changes to the other mag, it's a plug problem. If the same mag still drops, check the plug caps to see that they are screwed securely onto the wire. The plug caps just twist onto the wire and can work loose over time. The other end of the wire twists into the CDI unit. These also can work loose over time. If you have to change the wires, just cut the ends square across, put a tiny bit of dielectric grease on the end of the wire and just screw them into the CDI and the plug cap. If you look down into the plug cap with the wire removed, you will see what looks like a wood screw that the wire screws down onto. You could just have a wire problem. Almost always when a mag unit goes bad, it just quits altogether. A plug that sometimes works and sometimes doesn't, could account for the throttle hunting. I'd look here first. Plug wires are easy fixes. Like Aachem's razor, the simplest solution is usually the correct one. (hopefully)

Bill.

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Re: 582 wont start

by bill martin » 13 years ago

bill martin

10 757 0

Mike,

One other thing I forgot to mention. If you check the plugs and one cylinder has a one nice tan colored plug and one black one. That black one,or it's wiring, is probably the culprit.

Bill.

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