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  surge,skip, miss? troubleshoot theory advise

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Author Topic:   surge,skip, miss? troubleshoot theory advise
Cpt Quint posted 03-10-2003 09:54 AM ET (US)   Profile for Cpt Quint   Send Email to Cpt Quint  
2 weeks ago, just prior to pulling out and running on fumes, my 50 rude started to surged and jerked on me. I thought low gas, sucking in air. Last weekend after 2 hours, same thing but with 3 quarter tank of gas?
Once out I started investigating. Carbs were rebuilt, fuel pump and filter replaced in 2002.
Only happening at 3/4+ throttle. I pulled the lid and noticed oil around the plugs and for gosh sakes they were loose and I could turn by hand?! No idea how they got unscrewed.
I know little about compression but this would seem to be a potentail culprit for my problem causing compression and/or miss under higher throttle. What do you think? would this do any damage? Have tightened them back down, but wont get back in the water until this weekend,
Bigshot posted 03-10-2003 10:48 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Should be your problem, if not try some dry-gas. It could also be your lower unit but let's work on the easy stuff first.
Cpt Quint posted 03-10-2003 10:59 AM ET (US)     Profile for Cpt Quint  Send Email to Cpt Quint     
I hope its not lower unit but honestly only feels like a gas/compression issue. I would think a prop or lower gear slip would be more like hitting a log..this is more like an air block/ escape there anyway to tell?? Once dropped a gear in a 25 rude and it was quick and terminal, left me stranded and needing a tow.
Bigshot posted 03-10-2003 01:14 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Probably just the plugs. If not try a remote fuel tank and line to segregate that area, etc. When the lower unit starts to go in smaller engines it will miss like your engine is cutting out, does not feel like a clunk, just a miss. I would worry about the fuel first. Check and double check all your lines. Squeeze the ball and see if any gas drips, etc. Water in gas will cause a miss when running at certain rpm's as well.

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