|
Join Date: Dec 2006
02-17-2010, 4:34 PM
|
Reply
|
I own a 2000 Moomba Kamberra. I took it out a couple of weeks ago and the boat struggled to start. Once I got it going it wouldn't idle, so I kept it in neutral and the throttle down a bit. It was really smokey and ran rough. Could this be the carb? We had it out a couple of weeks before that and it ran great.
|
Join Date: Sep 2001
02-17-2010, 4:41 PM
|
Reply
|
Holley carb? Check the power valve! By smokey do you mean kinda a black smoke? Edit: Did it back fire through the carb when this issue started? (Message edited by peter_c on February 17, 2010)
|
Join Date: Oct 2007
02-17-2010, 4:44 PM
|
Reply
|
Sounds like a stuck choke. I'm guessing is has an electric fuel pump, so that leaves out a ruptured diaphragm.
|
Join Date: Dec 2006
02-17-2010, 4:52 PM
|
Reply
|
Yes, Holley carb - 4 barrel. it was black smoke. put in a new electric fuel pump last year. My buddy said it might be the stuck choke too? Any suggestions? he said that I might tap it with something???
|
Join Date: Dec 2006
02-17-2010, 4:53 PM
|
Reply
|
oh, also, not back firing through carb that was noticed. it just seemed like it would run if I kept the rpms high, but it was rough and smokey. If i pulled it back down it would die.
|
Join Date: Nov 2003
02-17-2010, 5:01 PM
|
Reply
|
Its loading up for some reason. Stuck choke like earlier mentioned is probably the cause. Next time out check that the choke plate is open after it warms up.
|
Join Date: Oct 2005
02-17-2010, 5:06 PM
|
Reply
|
Check float level,possible trash in the needle and seat,power valve. I would turn the key on so the fuel pump will run not the engine. Look in side the front two barrels and see if fuel is dripping.
|
Join Date: Sep 2001
02-17-2010, 5:16 PM
|
Reply
|
Power valves are the single most common reason for that. Check the choke it is easy to look down the carb with it running and see if the choke is open. You can pull the plug out from the side an check the fuel level for a stuck float or damaged needle/seat.
|
Join Date: Oct 2005
02-17-2010, 5:50 PM
|
Reply
|
Next time you run it. Put the throttle at about 3000 -3500 and see if it smooths out. If it does then you are just dumping to much fuel. peter is correct Holley's are known for blowing power valves.
|
Join Date: Mar 2007
02-18-2010, 7:54 AM
|
Reply
|
Peter, no sight plugs on every 4160 I've seen.
|
Join Date: Dec 2009
02-18-2010, 8:07 AM
|
Reply
|
power valve is not the problem the newer carbs come anti backfire devices to protect the power valve.It does sound like carb problems though.most common is a condition called VD venchuri discharge.with engine running at idle look in to the carb if you see fuel dripping down the barrel it's VD and time for a rebuild
|
Join Date: Jul 2002
02-18-2010, 10:12 AM
|
Reply
|
I like a stuck float, especially if it was fine when you put it away. Be careful looking down the carb on a engine that isn't running right. Taking a backfire in the face is a bad deal. Preferably wear some eye protection, if not a face shield when working on a running carb'd engine. Any way you look at it, it sounds like the carb is coming apart.
|
Join Date: Dec 2005
02-18-2010, 12:02 PM
|
Reply
|
High Jack. I've got 2 stroke jetskis ( carbed) that run fine at idle and high speed, but in order to get them to run at high speed you have to pull the choke which kills the motor, then restart, and it will run like a scalded ape. I have to do this almost every time coming off plane. one is worse thatn the other. Almsot liekt he bowls are not filling with fuel???
|
Join Date: Sep 2001
02-18-2010, 12:37 PM
|
Reply
|
The carb still has a power valve and they can fail without having ever seen a backfire. I did some research on the model that Steve says it is. Seems like they made some improvements to it. The two bent tubes at the top of the float bowls going into the carb should be the overflow for the float bowls. So if the problem is the float level or a leaking seat it should easily be seen coming out these tubes. Thanks Evan for reminding everyone to keep stupid at bay.
|
Join Date: Aug 2008
02-18-2010, 1:17 PM
|
Reply
|
" ... stupid at bay." ?!?!?
|
Join Date: Sep 2001
02-18-2010, 1:30 PM
|
Reply
|
Mr. Bay is stupid there now? I sure hope you don't take offense to a commonly used saying.
|
Join Date: Aug 2008
02-18-2010, 3:00 PM
|
Reply
|
I take offense to it like some to the r-word. It's use is only morally defensible if limited to 'able-minded people' and within the 'satire' exception. http://www.thedailyshow.com/watch/mon-february-8-2010/back-in-black---the-r-word
|
Join Date: Mar 2009
02-18-2010, 6:35 PM
|
Reply
|
Sam (wake1823) what ski's? your pop off pressure sounds wrong on the carb is is called venturi take the flame arrestor off and look for dripping fuel always when you rebuild the carb, never soak them in carb cleaner, marine carbs have a special sealer on them to keep moisture out of them. Also replace the fuel filters and clean the spark plugs and look at the cap and rotor Holleys are also know to air leak around the throttle shafts to test, spray carb cleaner around the shaft when motor running at idle if it picks up RPM, you have a leak!!!
|
Join Date: Feb 2010
02-19-2010, 11:14 AM
|
Reply
|
Just from the tech corner, if you have a 4160 holley carb and have not used the vessel in some time, most likely the needle is not sealing at the seat (even a piece of corrosion) will do it. not to mention the E10 problems that are starting to plaque our industry. to diognose the problem, apply water to feed under boat set choke by pushing accelorator down once return to idle position push or pull out button, set to desired fast idle and start remove spark arrestor let engine warm up put helm control to idle, look down airhorn at venturi's if you see fuel coming from these at idle your float level has become to high a rebiuld is the remedy. have a qualified technician rebuild it. holley carbs are the most advanced american carbs as with amarica there are t.s.b. technical service bullitens "be aware" as for some coating to prohibit moisture on the carbs that bull. and worn throttle shafts yah if was a 1984. you must use a genuine holley marine kit and power valve check kit installed if it does not have one. ta ta
|
Join Date: Feb 2010
02-19-2010, 11:33 AM
|
Reply
|
The two vent tubes are bent down for a reason "marine only" application so if the floats stick open the overflow of fuel will food out the engine,& not run everywhere and ignite by a spark thus having an explosion and the picnic is over. cold tanks are fine for carb cleaning, also a fuel water separator system is a must, E10 E10 ta ta
|
Join Date: Aug 2008
02-19-2010, 12:01 PM
|
Reply
|
i visit this thread out of curiosity because, long time ago, i tried to re-build a carb on my own. fail. mine was on an 8 cyl '73 chevy. it had a spaghetti-work of all these oddly bent linkage rods. (along all sides ??? iirc.) the goal was to re-bend those rods to adjust the output travel of the output ends to be at certain points for certain points of the input ends. could not do. it looked nothing like that Holley. that Holley is clean looking, seemingly free of all the linkages
|
Join Date: Mar 2009
02-19-2010, 11:36 PM
|
Reply
|
holleys are e-z to rebuild, you can get to everything, cept power valves, without removing the carb from motor yes there is a coating on the carbs call mallory marine and ask so why was the HOLLEY carbs recalled in 2002-2006???
|
Join Date: Feb 2010
02-22-2010, 1:36 PM
|
Reply
|
hey stay in your books but stay out of the garage. guys like you make me a lot of money. ta ta
|
Join Date: Dec 2005
02-22-2010, 2:08 PM
|
Reply
|
just-in-time...they are 97 yamaha waveraiders...one is the triple carb 1200 the other is dual carb 760 I think?
|
Join Date: Mar 2009
02-22-2010, 5:26 PM
|
Reply
|
SAM yes rebuild the carbs if you want the service manuals, email me Yamaha manuals are not the greatest, because they were translated from Japaneese DAVE if your quoting me, not very cool as an owner of a marine dealer
|
Join Date: Feb 2010
02-22-2010, 6:19 PM
|
Reply
|
Justin I am not quoting you, its just the 4160 has been in marine use since the v8, I myself have o/h over 100 since it is such a popular carb everyone seems to know a little something about them some more than others, manuals tsb's recalls just look at these blogs it's a famous carb but in my 20 years there have been numerous times the diy says hay I just went through that carb or just had it done by a mechanic ya there is one on every corner, ya see my point, even manuals are wrong sometimes. no hard feelings. Dave
|
Join Date: Mar 2009
02-22-2010, 6:26 PM
|
Reply
|
Yes same carb on my 351 Bronco, better then the 4 barrel quad jet The best book on that carb is the PCM manual or the holley carb itself no hard feelings, i though you were referring to me, LOL these newer holley's were recalled because they are made in china now, and they used tin inside the carb vs zinc!, LOL
|
Join Date: Apr 2004
02-23-2010, 8:12 AM
|
Reply
|
Spray/clean well with carb cleaner. Run a can of Sea Foam through. S/b good to go. I just went through this with my 1998 Moomba.
|
Join Date: Mar 2009
02-23-2010, 10:51 AM
|
Reply
|
spraying carb cleaner in a carb does absolutely nothing except maybe clean the piston tops of carbon the seafoam might help out
|
Join Date: Apr 2004
02-23-2010, 5:24 PM
|
Reply
|
"spraying carb cleaner in a carb does absolutely nothing" I beg to differ. It will clean spooge off choke shaft and associated linkages and thus help if the problem is in fact a poorly operating choke mechanism. A can of carb cleaner and a can of Sea Foam before any carb rebuilding is definitely the route to take. Ockham's Razor!
|
Join Date: Mar 2009
02-23-2010, 7:28 PM
|
Reply
|
still that does nothing when you rebuild the carb, you take car of it it is the internals that you want to clean
|
Join Date: Nov 2003
02-23-2010, 7:43 PM
|
Reply
|
"even manuals are wrong sometimes" Man aint that the truth. Dont tell that to someone who believes everything has to be done "by the book". Spraying carb cleaner does plenty. It works great for free-ing up sticky and dirty linkage, which sometimes is the problem.
|
Join Date: Mar 2009
02-23-2010, 8:50 PM
|
Reply
|
Sparkels right out of the HOLLEY book they make the carb, no way they are wrong, that is why they do service bulletins if they were they would be sued!
|
Join Date: Oct 2005
02-24-2010, 4:53 AM
|
Reply
|
"Experienced technicians develop their own order or method of disassembly" With that statement they are even saying you don't have to do it by the book. By the book is a suggested method NOT the only method.
|
Join Date: Nov 2003
02-24-2010, 11:22 AM
|
Reply
|
Justin: and your point is what? That carb and choke cleaner still does "nothing". Thats it I'm going to sue the liars that sell it! LOL
|
Join Date: Mar 2009
02-24-2010, 11:44 AM
|
Reply
|
what im saying about carb cleaner is spraying down throat does nothing internally to the carb, that is where the varnish resides
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is On
|
|
|
All times are GMT -7. The time now is 3:11 PM.
|
|