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remi19
MMT Pro Member
Joined: Wed Jan 28, 2009 9:56 am
Posts: 63
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 RPM's in water and out I have a 23hp long tail go devil and have some rpm problems. i have twin 23's and while runing out of the water the rpms at full throttle is around 3400 to 3500 on both. when i put the boat in the water one of the engines at full throttle is at 2400 while the other is at 3500. Any ideas on whats happening here? changed the oil and spark plugs and didn't help. engine with the rpm problem also blows white smoke sometimes.
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1856 twin 23 GDLT
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| Thu Jan 29, 2009 11:07 am |
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Gigafowl
MMT Elite Member
Joined: Tue Jan 13, 2009 7:19 pm
Posts: 6441
Location: Trinity Bay - Texas
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Re: RPM's in water and out Sounds like a dead cylinder...
Run the boat on just the problem engine - bet it dies when you pull one of the plug wires off... That will be the good cylinder...
Run compression test on other cylinder to see if it is mechanical...
If good compression is observed it is electrical...
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Eat - Sleep - Hunt ! ! !
"It is good to have an end to journey toward; but
it is the journey that matters, in the end."
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| Thu Jan 29, 2009 10:16 pm |
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tongthrower
MMT Addict
Joined: Wed Jan 14, 2009 8:36 am
Posts: 672
Location: Houston, TX
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Re: RPM's in water and out Try the plug wire thing, or see what cylinder head is cold after it runs. Once you figure out the bad guy....you are on your way.
I had a 23 that did the same thing, changed plugs, coils, fuel lines, gas and all that. The compression checked out ok as well. I thought the carb was really clean. However, when I took the carb off, and soaked it in acetone or carb cleaner for a few hours it worked just dandy after that. Be careful not to let any of the neoprene or plastic that may be on the carb come into contact with the cleaner.
Good luck, and don't forget to put a good inline fuel filter on there when you get it running again.
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EVT Stage 1 32PD on a 17x48PD
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| Tue Feb 03, 2009 11:50 am |
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remi19
MMT Pro Member
Joined: Wed Jan 28, 2009 9:56 am
Posts: 63
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Re: RPM's in water and out Did compression test, not good. what should i do now, time for new engine or should i look into rebuilding current engine.
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1856 twin 23 GDLT
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| Wed Feb 04, 2009 4:58 pm |
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50fps
MMT 1000 Club
Joined: Tue Jan 13, 2009 6:42 pm
Posts: 2377
Location: West Coast Wisconsin
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Re: RPM's in water and out I had a similiar issue with the 23 GDLT I had and it was a bad headgasket. What readings are you getting on the compression test, also how did the spark plug look on the bad cyl? Was the gap closed up, like it had made contact?
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| Thu Feb 05, 2009 11:09 am |
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remi19
MMT Pro Member
Joined: Wed Jan 28, 2009 9:56 am
Posts: 63
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Re: RPM's in water and out Compression is about 50lbs lower than what it should. spark plugs looked good, nice gap between, not sure what to do.the other engine is brand new. lookin real hard at them surfave drives.
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1856 twin 23 GDLT
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| Thu Feb 05, 2009 11:39 am |
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Gigafowl
MMT Elite Member
Joined: Tue Jan 13, 2009 7:19 pm
Posts: 6441
Location: Trinity Bay - Texas
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Re: RPM's in water and out Sorry to hear bout the compression - what is your warranty status - are there any good repair guys near you ???
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Eat - Sleep - Hunt ! ! !
"It is good to have an end to journey toward; but
it is the journey that matters, in the end."
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| Thu Feb 05, 2009 9:29 pm |
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remi19
MMT Pro Member
Joined: Wed Jan 28, 2009 9:56 am
Posts: 63
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Re: RPM's in water and out No warranty. Its in good hands, at a GD dealer in beaumont. Just trying to decide if i want to fix the engine or up grade and get a surface drive. thanks for the help
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1856 twin 23 GDLT
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| Thu Feb 05, 2009 10:01 pm |
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adamski
MMT Member
Joined: Mon Feb 09, 2009 9:57 am
Posts: 14
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Re: RPM's in water and out check your pm's
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| Mon Feb 09, 2009 10:06 am |
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