Briggs 5hp Outboard Overspeed Limiter

[tek_shrek]

On the second outing, it appears that the overspeed limiter on my new Briggs 5hp outboard is stopping the engine. Doesn't surprise me since I'm a new boater and I've definitely scrubbed the prop through some mud/sand. The motor runs fine until I take it to full power then the overspeed limiter sputter's it off. I don't have a repair manual but I've ordered a new shear cone ($7.50). Has anyone 1) replaced a shear cone on this motor; 2) did it fix the problem; 3) do I need to reset the overspeed limiter or will that happen autmatically when the new shear cone keeps the RPM under 4800?

 

[Drowned Rat]

Re: Briggs 5hp Outboard Overspeed Limiter

Hi tek-shrek. Welcome to iboats. Is your motor a 2002 model? These first run motors had problems with the rev limiter and would make the motor run rough or not at all after it had been tripped the first time. Does your motor run ok at speeds below 4800? The limiter does not need to be reset. If your shear cone is indeed bad, installing a new one will fix the problem. Have you inspected the cone yet to see if it's bad? I'm just curious to see how these motors are doing as I have one too. Good luck and keep posting.

 

[tek_shrek]

Re: Briggs 5hp Outboard Overspeed Limiter

Originally posted by Drowned Rat:<br /> Hi tek-shrek. Welcome to iboats. Is your motor a 2002 model? These first run motors had problems with the rev limiter and would make the motor run rough or not at all after it had been tripped the first time. Does your motor run ok at speeds below 4800? The limiter does not need to be reset. If your shear cone is indeed bad, installing a new one will fix the problem. Have you inspected the cone yet to see if it's bad? I'm just curious to see how these motors are doing as I have one too. Good luck and keep posting.

 

[tek_shrek]

Re: Briggs 5hp Outboard Overspeed Limiter

I just purchased the motor new so it's unlikely to be a first run 2002 model, but I'll see if the serial number suggests it. I haven't inspected disassembled it to inspect the cone yet, I wanted to get the repair manual first. From the parts drawing it just looks like (and is priced like) the kind of part that would be designed to be sacrificed to protect the blade and motor. I'll certainly let you know if the shear cone replacement corrects the situtation. Thanks.

 

[sloopy]

Re: Briggs 5hp Outboard Overspeed Limiter

OK, a lot of bull **** being thrown around here.<br /><br />The Briggs and Stratton engine will never be able to get to 4800 rpm! When in gear at full throttle the best RPM I have ever achieved was 3500 and most of the time it is at 3100rpm at full throttle. At full throttle with the rev limiter disconnected and not in gear I have reached 5000 rpm in short burst. At that speed the engine can literally rip itself apart; something the BS engine can also do when making turns at 2000rpm, idleing (sp) at the dock, or when switching into reverse.<br />I do not know what you mean by shear cone. The propeller has a rubber hub that is designed to absorb shock, I doubt that would ever brake, if it did you would also destroy the propeller.<br />(edit)I am on my 3rd engine. (edit) The engine will work nicely for two months, after that the rev limiter will prevent you from starting.<br /> This OB SHOULD NEVER be placed into reverse until you come to a complete stop, EVEN WHEN DOCKING. The clasp that locks on to the the trim pin, is nearly the size of the pin, if you are moving forward the clasp will miss and it will swing up, brake the engine mount and land nicely with a spinning propeller on your lap. <br />If you guys what to here the whole story, My story with this outboard can take up two whole 48hours shows.<br /><br />P.S I just got my engine back from being in the repair shop for 5 months (they repaired the engine mount) when I got it back it would not start. The timing was off, the idle was not set right and the oil had water in it. It still will not work like it use too. I plan to check the valve clearances tomorrow.

 

[Drowned Rat]

Re: Briggs 5hp Outboard Overspeed Limiter

OK, a lot of bull **** being thrown around here

What are you talking about Sloopy? The rev limiter is designed to prevent the engine from overspeeding in the event it cavitates or aerates. I don't think anyone was saying their motor runs at 4800 regularly. The shear cone is designed to, you guessed it, Shear, if the prop strikes an object with significant force. It's not designed to save the prop from damage, it's designed to save the lower unit. Not sure what you mean about the reverse problem you had. As long as the RPM is at idle speed, you can shift into reverse, just make sure the reverse lock engages before you increase throttle. The tolerances are close I must agree. Why do you think tek-shrek's motor is ataining 4800 RPM and tripping the rev limiter? What is your diagnosis? A bad shear cone is definitely a possibility. I think he is trouble shooting his engine correctly. You disagree?

 

[sloopy]

Re: Briggs 5hp Outboard Overspeed Limiter

Rat, you can not brake the shear cone. Try all you want you will never be able to do it. YOU were talking about achieving 4800 rpm so I assumed that you thought the engine can go 4800 rpm regularly. I have to go to school and will add more later.

 

[Drowned Rat]

Re: Briggs 5hp Outboard Overspeed Limiter

Sloopy, you are trying to tell me the shear cone is there to dampen a vibration from the prop? Okay. You may not be able to brake the shear cone but you can break it. That is why it is there. Look in the manual.<br /><br />The Rat.

 

[sea king 5]

Re: Briggs 5hp Outboard Overspeed Limiter

You guyes need to look in the manuel to see what the rpms are for sure,I think I recall that 4200 rpms was the point at wich you have rod stretch,and eventuall failure,B/S was known and still is I think,for taking a small engine builing up the lower end (rods and crank)and jacking up the rpms,at any rate MAKE SURE you know @ what point you have failure,I had a 16Hpr single cyl go high speed and fail.It sounds like H--- when it happends, and cost me $600.00 to get fixed.

 

[chris in va]

Re: Briggs 5hp Outboard Overspeed Limiter

Along those lines, mine still doesn't come up to full power like it did before it hit the rev limiter the first time. <br /><br />They replaced it with a Gen II limiter but I still can't get over 13mph gps indicated. It used to run at 15.5.<br /><br />Problem is, the local "Master Tech" doesn't have any way to test the motor in a barrel, etc so they can't do a load test on it. Oh well, I plan on getting a Bass Tracker setup with a 9.9 once my bow rider sells.

 

[sea king 5]

Re: Briggs 5hp Outboard Overspeed Limiter

A barrel doesn't give you an actuall acurate way to test your engine, it will only get you in the naiborhood on your fuel air mix, every thing changes when you get on the water, thats the only place I've been able to get it rite. All engines act diferent under load.

 

[chunkachange]

Re: Briggs 5hp Outboard Overspeed Limiter

I just bought a one of these motors in the camo design for my grandson. I was hoping it would be a reliable motor, but hearing some of these problems, I dont know. Any positive things about it? Thanks, Chunk

 

[chris in va]

Re: Briggs 5hp Outboard Overspeed Limiter

No, it's fine...reliable and all, but I just seem to have some power issues with mine after aerating the third time I used it. Ever since then it hasn't had full power like when new. But it has started every time and got me wherever I wanted to go and back.<br /><br />Just be sure not to lay it on the wrong side in your garage and everything will be fine.

 

[buckaroo]

Re: Briggs 5hp Outboard Overspeed Limiter

Originally posted by chunkachange:<br /> I just bought a one of these motors in the camo design for my grandson. I was hoping it would be a reliable motor, but hearing some of these problems, I dont know. Any positive things about it? Thanks, Chunk [/QUOTE<br /><br />I bought one last year and it runs great and never have had any probplems with it at all. This year I drained the oil and use a sutable synthetic and it pushes my Old Town 18" squarestern with two people in it at about 11mph (GPS)... I got the motor for two reasons one being the price and the second is that I do alot of fishing in remote parts of the state and felt that if there were any problems that I would be able to find some B&S dealer close by.