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#12
05-07-2007, 10:41 PM
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Re: Carbs leaking
Did the so called commercial engines have a restrictor on them preventing RPM advance or retarding advance. I know some commercial equipment you can rent have those on them. Just a thought?
Also can you rev the engine out of gear (in the water) to above that RPM. If it does not go above like that then I think you have a timing issue. Also what is the condition of the lower unit, if it is under load and won't reach the desired range but will do it with no load the lower unit can be causing the problem with a lube or bearing problem. In the carbs you can also have a restrictor plate preventing fuel flow above a certain CFM Just some thoughts, have you ever gotten the manual on those commercial engines, if there was any restrictor type things it should be noted in the shop manual. The reason I think it might be related to something of that nature is you changed the props pretty substantially and saw no changes in RPM's. I never heard of that ???
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Willy 1986 V20 Old School 1992 V20 1992 150 Yamaha 1997 HydraSport 2250 Vector 2009 17' G3 Outfitter "G Spot" http://www.youtube.com/watch?v=TDebw...eature=related "I won't be wronged, I won't be insulted and I won't be laid on a hand on. I don't do these things to others and I require the same from them" JW 
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#13
05-09-2007, 09:03 AM
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Re: Carbs leaking
Wish Pipe Dream would jump in here...he operated one of those motors for quite a while...Hey Pipe...what's goin' on here??...any ideas??...
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'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha 
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#14
05-09-2007, 09:45 AM
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Re: Carbs leaking
Don't believe I can be of much help here, sorry.
I never had an issue with fuel leakage when I trimmed the engine out of the water. You mentioned tilting it straight up -- I believe mine was always turned all the way to starboard when I brought it up, it just seemed to naturally go that way. Have anything to do with it? I don't know. As far as RPMs, it's been a few years and I never wrote down what kind of revs I was getting at speeds, and so on. But I don't believe I ever got her to 5000, only high 4s. I can tell you that that 155 was a really durable engine. We got a LOT of service out of it, and it just wouldn't die. For years the guys at the marina called it the "miracle motor," among other things. ::)
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#15
05-09-2007, 06:11 PM
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Re: Carbs leaking
I'll take a stab at the lack of RPM's. I think the larger gear case on the commercials plays into the equation. i don't know if its the bigger gears or perhaps the additional drag going through the water. ??? Just a couple of things to think about.
Other than what I posted above, I know some guys have gotten a few more RPM's after a decarb. This may do the trick since the motor hasnt been able to get to the top end of its RPM range it may be all carboned up.
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#16
05-15-2007, 08:03 PM
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Re: Carbs leaking
O K , this is what I've tried since the last post. I've replaced all the fuel lines 3/8" from the tank to the VRO. Installed a new VRO and ran a heavy concentration 4 to1 of Sea foam through the engine. Had to readjust the idle after the Sea foam treatment because the idle went up to 1400 rpm's. And I also replaced the water pump. I'll take her out Saturday on the Delaware bay and open her up. Hopefully I'll get to the 5000 range and I'll be happy. If this doesn't work maybe I should change the lower gear case from the V8 to a V6. I'll keep you posted on the results. In the mean time any and all suggestions are welcome.
Dennis
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