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Author Topic:   Oil substance coming from exhaust
Dango posted 02-22-2004 04:19 PM ET (US)   Profile for Dango   Send Email to Dango  
1987 Yamaha Pro 50. No problems until now that I've noticed a murky, brownish, oily substance coming out of the prop when in idle. Is this a piston ring issue or perhaps something not quite so traumatic?
Thanks for any (not so traumatic) news!
hooter posted 02-23-2004 11:53 AM ET (US)     Profile for hooter    
Blown rings would increase emissions, but you'd be noticin' other problems with the engine's performance, i.e. loss of power, below-spec compression. A quick, cheap check with a compression gauge will confirm the status of your rings. This sounds just like a normal 2-cycle emission to me.
Sal DiMercurio posted 02-23-2004 12:23 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Hooter is right.
It's just the unburned oil mixed at 50,1 when at idle only needs approx 150.1.
It's normal.
This happens when idling for long periods of time, like slow trolling or having to idle a long way in no wake zones.
Bigshot posted 02-23-2004 01:48 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Probably time to rebuild carbs being a 1987. She is probably gumed up a bit and maybe running too rich at low speeds. Better to be rich than lean.
george nagy posted 02-26-2004 05:05 PM ET (US)     Profile for george nagy  Send Email to george nagy     
If it is light in color I would check the lower unit gear lube, could have a bad seal.

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