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Old 07-07-2008, 05:55 AM
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Default Idle Adjustment for '93 Evinrude 200 (carb)

Since I "hijacked" a 2 year old thread... I am now starting another one.

I need to increase the idle on my '93 Evinrude 200 (carb). It idles rough around 500 in neutral and eventually stalls out. I was told that I should increase it to about 750 RPM in neutral and 600 RPM in gear. I have already checked for air leaks and that wasn't the problem. Also, when I increase the idle from the controls at the helm, she runs fine.

I'm not sure which adjustment screw to use, so I went to the boat this morning and took a couple of pictures. Is the idle adjustment screw A, B or C? I'm pretty sure that it is B, but I don't want to guess.

Thanks.
David











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Old 07-07-2008, 06:11 AM
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Default Re: Idle Adjustment for '93 Evinrude 200 (carb)

Those adjustment screws are for timing only if I remenber right.Adjust it from you throttle linkage and then set your stop screws.When was the last time you decarbed the motor?That in itself might do the trick.
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Old 07-07-2008, 06:24 AM
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Default Re: Idle Adjustment for '93 Evinrude 200 (carb)

It is B. Johnson and evinrude motors use timing to adjust idle rpm while keeping the throttle bodies(butterflies) fully closed, unlike yamaha which uses the an adjustment to open the throttle bodies to increase rpm. A quick sync and link should be performed before making any adjustments on your engine. Has it always idled this low or has it just started? What is the compression on the engine? DEcarbing and new plugs are a good idea before making any adjustments also. I myself used to idle these engines down real low around 500 rpm to make adjustments to the carbs(easier to hear them sneeze and cough)and on one occasion actually had to rejet a few of the carbs because the engine had lost some compression.
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Old 07-07-2008, 07:37 AM
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Default Re: Idle Adjustment for '93 Evinrude 200 (carb)

Thank you. I just bought the boat last August and had my mechanic clean the carbs since the boat wasn't used much. I just checked my notes and when I had it surveyed, the compression was very good. The high was 118 and the low was 114. Eventhough this was a '93 motor, I don't think that it had many hours on it. The boat (an '81) only had 1000 hours on it and this was the 2nd engine.

She runs great while cruising (around 4k RPM). She also idles much better and with less smoke when I use the throttle to increase idle to about 800 RPM. I also replaced the plugs after I burned off the fogging oil. As for the decarb, my mechanic suggested against an aggressive decarb and recommended that I use OMC Carbon Guard (I think that is what it's called) in the tank. He recommends this as we are not sure if the engine had ever been decarbed and he is of the believe that slow cleaning is better than a "shock to the system". I'm not sure that I agree, but then again, I know very little about this stuff.

Either way, I'm sure that I still need to increase the idle. I know that I have a 50/50 shot at getting it right, but... do you turn it clockwise or counter clockwise to increase the idle? I tried playing with it a bit yesterday and only turned it 2 turns and didn't notice any change. I was affraid to try any more until I confirmed the correct proceedure.

Thanks.
David

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Old 07-07-2008, 08:10 AM
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Default Re: Idle Adjustment for '93 Evinrude 200 (carb)

Loosen the lock nut with the engine turned off and then turn in clockwise to increase the timing. Make sure the throttle linkage has the arm tight back against the stop. To check and make sure the throttle linkage is tight and against the stop just make sure there is no play in the arm that moves back and forth advancing the timing and opens up the carbs. If it needs to be tightened adjust the cable at the anchor point on the motor.
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Old 07-07-2008, 08:44 AM
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Default Re: Idle Adjustment for '93 Evinrude 200 (carb)

Aaaaahhh... the locknut. That makes sense. I didn't even notice it since it was covered in grease. No wonder nothing was happening.

I will try and get to the boat this afternoon and try the adjustment and let you know. Thanks.

David
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Old 07-07-2008, 09:37 AM
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Default Re: Idle Adjustment for '93 Evinrude 200 (carb)

Quote:
robalo78 - 7/7/2008 11:10 AM

Loosen the lock nut with the engine turned off and then turn in clockwise to increase the timing. Make sure the throttle linkage has the arm tight back against the stop. To check and make sure the throttle linkage is tight and against the stop just make sure there is no play in the arm that moves back and forth advancing the timing and opens up the carbs. If it needs to be tightened adjust the cable at the anchor point on the motor.
You turn the screw out to advance or raise the idle speed. Turning the screw in moves the timing base away from the timing stop thus retarding it. From the looks of your pictures of how the linkage is currently set, I would get a timing light on it and see where your at at idle. There is a timing range that it should be in at the desired idle speed, if it is outside that range then you need to find out why. It appears from your pictures that you may actually be all the way out on the adjustment currently, and your timing stop appears to be pretty far out as well. And it's hard to tell from your pictures, but your throttle pick-up appears to out of adjustment as well. Many people say they can set these engines up, but not many take the time to do everything on them. I cannot tell you how many engines have been brought to me that were supposedly just gone through by a master EVINRUDE tech and the link and sync was so far off it was a wonder it would even idle. There not hard to set up, just takes a little time.
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Old 07-10-2008, 07:03 PM
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Default Problem Solved

Problem solved. I had the mechanic look at the engine today since I couldn't figure out the problem. Tt was taking much too much oil. It seems that the fuel/oil Pump went bad. I guess that too much oil in the engine is better than no oil...

Anyway, after replacing the pump as well as the fouled plugs and misc adjustments, I was on my way 2 hours later. She runs great and idles properly with very little smoke.

By the way, if anyone needs service on an Evinrude in Central NJ (Keyport), I highly recommend Seaboard Marine. If you go, tell them David Levitt sent you...

Thank you all for your help.

David
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