jbjennings
Captain
- Joined
- Jul 18, 2007
- Messages
- 3,903
Finally got the old '73 merc 650 purring. Using the advice on the forum, the engine is properly tuned and timed, and the carbs don't leak too badly when tilting the engine moderately. HOWEVER, the carbs do tend to leak about 10 drops apiece when the engine is turned off---after about 10-30 seconds passes. I think it may be getting better about it.
ONe person posted the cause of this according to the manual was possible reed valve malfunction. THat is my question: HOW! I can see fuel spurting out of the carbs when the engine was running, but not how they could do it when the engine is not turning. Does anyone have any clues about this. I did notice a little surface corrosion on some of the reed blocks on the crank, but nothing I thought was worth fixing. (obviously, I could be mistaken). The motor idles good, accelerates good, and runs WOT great--no missing and great power. COuld I have a reed problem and could someone explain the concept to me how bad reeds could result in leakage out the carb throat after the engine is off? THe leakage DOES appear to be coming from the engine through the throat nad not out the brass orifices. Either way, it runs great and the leakage is not great enough to worry about AFAIK. BTW, I did check the fuel pump diaphragm, and it doesn't appear to be bad at all. ALmost new looking and I did do my best to check for pinhole leaks. The motor never floods and is easy as pie to start even when cold.
thanks,
JBJ
ONe person posted the cause of this according to the manual was possible reed valve malfunction. THat is my question: HOW! I can see fuel spurting out of the carbs when the engine was running, but not how they could do it when the engine is not turning. Does anyone have any clues about this. I did notice a little surface corrosion on some of the reed blocks on the crank, but nothing I thought was worth fixing. (obviously, I could be mistaken). The motor idles good, accelerates good, and runs WOT great--no missing and great power. COuld I have a reed problem and could someone explain the concept to me how bad reeds could result in leakage out the carb throat after the engine is off? THe leakage DOES appear to be coming from the engine through the throat nad not out the brass orifices. Either way, it runs great and the leakage is not great enough to worry about AFAIK. BTW, I did check the fuel pump diaphragm, and it doesn't appear to be bad at all. ALmost new looking and I did do my best to check for pinhole leaks. The motor never floods and is easy as pie to start even when cold.
thanks,
JBJ
