I have a 1993 50 hp Evinrude that has been sitting in my garage for 4 years un-used. (I fogged the engine before putting it away and ran it out of gas.)
I am finally getting a chance to use it again so I put the muffs on it in the driveway and put some new gas (& sea foam) in the tank. It starts ok but idles too high (1500-1700 or so).
After a few minutes of idling, the tach starts to act erratic increasing to as much as 2500 and then it makes a popping noise with exhaust blowing out of the prop and the tach drops down to the 1000-1500 area. The tach starts to increase and every few seconds it sputters again. I also noticed an odd odor it seems to be creating when running. It sort of smells like bad gas even though there isn't any bad gas in the engine. I don't know if it could be just the fogging oil burning off but I have run it for probably 30 minutes or so. I would think that would be long enough to get rid of the smell.
I checked the plugs and they appear to be in good shape.
I had the carbs rebuilt about 5-6 years ago at a local chain outdoor store. It was running fine 4 years ago when I last used it. I likely will need to take this to a mechanic unless it is something relatively simple.
If you have any ideas or suggestions, please let me know. Thanks for your help.
I am finally getting a chance to use it again so I put the muffs on it in the driveway and put some new gas (& sea foam) in the tank. It starts ok but idles too high (1500-1700 or so).
After a few minutes of idling, the tach starts to act erratic increasing to as much as 2500 and then it makes a popping noise with exhaust blowing out of the prop and the tach drops down to the 1000-1500 area. The tach starts to increase and every few seconds it sputters again. I also noticed an odd odor it seems to be creating when running. It sort of smells like bad gas even though there isn't any bad gas in the engine. I don't know if it could be just the fogging oil burning off but I have run it for probably 30 minutes or so. I would think that would be long enough to get rid of the smell.
I checked the plugs and they appear to be in good shape.
I had the carbs rebuilt about 5-6 years ago at a local chain outdoor store. It was running fine 4 years ago when I last used it. I likely will need to take this to a mechanic unless it is something relatively simple.
If you have any ideas or suggestions, please let me know. Thanks for your help.
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