surge, skip, miss? troubleshoottheory advise

[Cpt Quint]

2 weeks ago just prior to pulling out and runnibng on fumes, my 50 rude started surge and jerk on me. I thought low gas, suckin in air. Last weekend after couple hours, same thing but w/ 3/4 tank left. Once out I investigated. Carbs redone, fule filter and pump replaced in 2002. <br />Only at 3/4+ throttle. Pulled the lid and noticed oil around the plugs and for gosh sakes they had become loose enough to turn by hand?!<br />Tightened back down. Know little about compression, etc... but I think this could be the culprit. Someone suggested lower unit but it didnt feel gear related as much as just loss power/pressure ??

 

[rickdb1boat]

Re: surge, skip, miss? troubleshoottheory advise

Did it run good after you tightened the plugs up? If so, you probably found your problem.

 

[Yepblaze]

Re: surge, skip, miss? troubleshoottheory advise

Fuel starvation, maybe or, perhaps shift dogs in the lower unit will do the random "jerk".

 

[Cpt Quint]

Re: surge, skip, miss? troubleshoottheory advise

not yet put her back in, just saw the loose plugs yday. I would think lower gear prob would be more of a clank that you would feel through the steering. This is more like a loss of power, as if you were abruptly de-throttling. plus I would think lower gear issue would be quick and permanent leaving you needing a tow. This motor is pretty clean and has the lower gear unit changed annually and its always clean. Is there anyway to tell the difference between a loss of power surge from a gear slip?

 

[Solittle]

Re: surge, skip, miss? troubleshoottheory advise

Yep - gears do not slip - they are engaged or not.