| Author |
Message |
    
Brian Smith
New member
Username: tnwalker
Post Number: 1
Registered: 05-2008
| | Posted on Thursday, May 08, 2008 - 05:26 pm: | 
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I have a 2004 BF 50A that will run fine, and then the RPM will drop from 1000 to 800 and it will run rough. I'll up the idle back to 1000, and then when I get home to flush it out it will run at 2000 RPM, so I'll back the idle back down to 1000. I've sync the carbs so I know that isn't the issue. I'm thinking of taking the carbs off and cleaning them. I'm just wondering is there anything else that might give these symptons before I take the carbs off? Thanks for the help. |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 4083
Registered: 09-2006
| | Posted on Saturday, May 10, 2008 - 11:33 am: |
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how did u synce the carbs? |
Brian Smith
New member
Username: tnwalker
Post Number: 2
Registered: 05-2008
| | Posted on Saturday, May 10, 2008 - 11:58 am: |
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justintime, first off thanks for the reply. I used a carbtune. I'm been thinking about this some, and I'm wondering if I might have a leak in the gasket between the carbs and the manifold, but I thought that would act up all the time, but maybe when the engine warms up it creates a small opening around the gasket. I'm going out later on today and spay some WD 40 on the gasket around the carbs to see if the RPM will lower. If it does I'll know that it's a leak. That's really all I can think of. You have any other ideals? |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 4089
Registered: 09-2006
| | Posted on Saturday, May 10, 2008 - 12:12 pm: |
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did u sync to hondas spec? |
Brian Smith
New member
Username: tnwalker
Post Number: 3
Registered: 05-2008
| | Posted on Saturday, May 10, 2008 - 01:10 pm: |
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Yes, I used a Honda repair manual. Each carb is set at 24 hg which is around 12 psi, it allows an 20mm (0.78in) Hg vacuum from highest to lowest is acceptable. I guess I should say number 1 carb was around 24 hg , and I set the other two to that. Number 1 being the main carb. Don't have to much control of the number one carb. Whatever it is you have to sync 2 and 3 to one. So I know the carburetor adjustments and synchronization is correct. Like I said it might be a leak in the gasket or it could be somewhere else. That would explain why you can't keep the idle adjusted. You adjust according to Honda specs and if air is coming in somewhere to the engine side of the carbs it would change the fuel mixure. Making it either rich or lean. It could also be something in the carbs that is blocking the jets enough to make it run rough. When you don't run the motor for awhile it allows the pressure to back off and it runs fine. I'm going to check for leaks first, and wait until I do that before I break the carbs off, but if I can't find a leak then I'll remove the carbs and clean them. Thats the only two things I can think of that might be the problem. |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 4099
Registered: 09-2006
| | Posted on Tuesday, May 13, 2008 - 07:05 pm: |
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u needed to adjust idle then adjust #1 and work down
i snap the trhottle each time a sync 1 to each other |
Brian Smith
Member
Username: tnwalker
Post Number: 4
Registered: 05-2008
| | Posted on Wednesday, May 14, 2008 - 09:39 am: |
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justintime, I did rev the motor a little during the sync. I checked for leaks, and didn't find any. I changed the fuel filter, and still it running the same. I got some gaskets, and I'm going to pull the carbs off today, and soak them overnight, and try to reinstall them tomorrow. Hopefully tomorrow evening I'll be back in bussiness. |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 4128
Registered: 09-2006
| | Posted on Wednesday, May 14, 2008 - 10:21 pm: |
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do not soak carbs!!!!!!
just clean them really good!! |
Brian Smith
Member
Username: tnwalker
Post Number: 5
Registered: 05-2008
| | Posted on Friday, May 16, 2008 - 11:35 am: |
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OK, why not soak the carbs? I read your post but didn't responed Thurs morning as I was wanting to get started. I took your advice and didn't soak them. I just cleaned them out good. When I pulled the carbs I had water in them. So I cleaned them out. The water must have been in there awhile, for algie was growing in them. Last year I had got some gas that I thought was bad, but it started running OK after I refueled, so I didn't think anymore about it. I also went ahead and put a water seperater on, so hopefully if I get anymore bad gas it will remove the water before it gets to the carbs. Yesterday, after I got it all back together, I fired the Honda up and it ran perfect again. Just-IN-Time thanks for the help. |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 4151
Registered: 09-2006
| | Posted on Friday, May 16, 2008 - 08:55 pm: |
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reason why is marine carbs have a coating on them to resist water intrusion |
Brian Smith
Member
Username: tnwalker
Post Number: 6
Registered: 05-2008
| | Posted on Sunday, May 18, 2008 - 06:06 pm: |
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I didn't know that. Thanks |
Jimmy Coumanis
New member
Username: jncbama12
Post Number: 1
Registered: 06-2008
| | Posted on Tuesday, June 24, 2008 - 10:02 am: |
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07 50 hp 4 stroke. Hard to start on a cold engine. One day it will just turn over & over. Next trip it will turn over for about 5 seconds (which at that point I stop according to the manual) After 10 seconds I'll try again and it tries to start as it's turning over. End up having to use the fast idle lever. Next trip it will fire right up. Each trip is always different. I've had it to the dealer 3 times and of course it fires right up for them. Same starting procedure for them as me except I'm in the water and they are in their service department. Any suggestions? |
