Briggs n Stratton Outboard

[fucawi]

Re: Briggs n Stratton Outboard

thats fuel in ...the one at the bottom is a drain for the bowl ...other on on top is the overflow from the bowl for rough conditions ( on land )

 

[sal3030]

Re: Briggs n Stratton Outboard

Thanks! Exactly what I needed. Should I remove the two drain tubes for the sake of neatness?
Also, I looked up the British Seagull. Wish I could find one of those. This one I built is bigger and heavier than I wanted.

 

[fucawi]

Re: Briggs n Stratton Outboard

yes you dont need them in a boat situation

 

[sal3030]

Re: Briggs n Stratton Outboard

Do either of you two guys have any suggestions regarding this new carb install? I will of course remove the governor arm (I will leave the internals) You both seem to know a lot about Briggs and Stratton and Small Engines in general. Thanks

 

[mrcrabs]

Re: Briggs n Stratton Outboard

modifications like removing the governor can lead to a fatality's, (chunks of flywheel in your head) on some forums its a no no to even talk about it, that being said, I would look for a forum that deals with mini bike mods, there knowlage pool will be most helpful for what you are doing.

Good luck

 

[sal3030]

Re: Briggs n Stratton Outboard

I know what you are saying. I have read that the go kart guys take them off all the time and drive the engines well over 3600rpm. I intended on limiting it to 3600 in the water with the throttle cable. I am not looking to drive it faster than recommended. You can put your foot to the floor in neutral with your car. I don't plan on allowing that to even happen. Thanks.

 

[fucawi]

Re: Briggs n Stratton Outboard

you will limit it to 3600 by correct selection of the propeller ..not the throttle which will be wide open !!!!..you will have to do the engineering to get the carb on....certainly you will need to be able to work metal and braze tig weld or siver solder to engineer a new manifold

 

[sal3030]

Re: Briggs n Stratton Outboard

Thanks. I am a Mechanical Engineer and worked designing gear heads and motion components. Just not familiar with carbs.

 

[fucawi]

Re: Briggs n Stratton Outboard

As long as your "manifold " is airtight it wil lbe fine ..I would not bring the piple across the head like some of the originals ..put the carb near the inlet port ..aids starting

 

[sal3030]

Re: Briggs n Stratton Outboard

I intend on mounting it where the original is.

 

[Tommy Two Stroke]

Re: Briggs n Stratton Outboard

He had been out of town for a tractor show when it hit, he said no power or cable until about 2:30 Thursday, yard scattered with limbs and leaves.

Is your briggs working off of a govener style throttle or direct connection?
Thats the thing I don't like about the briggs conversions is there carb and timing sytem....the Tecumseh 2 strokes are real power houses in a very little package with a real timing & fuel linked & sync thottle system.

I bought a 7/16 drive shaft splined 5/8 Eska direct coupler a few months ago from fleabay for just a few bucks just incase I ever got the itch to do a conversion of some sort....

mrcrabs, pretty much all 4-stroke small engines have fixed timing, it's not just a B&S thing. Tecumseh 4-strokes are the same way. The Tecumseh 2-strokes are power houses, but the big advantage of a 4-stroke conversion is fuel efficiency....I've heard of people going out for hours on a single fill up of gas in the tank that comes installed on the engine. That's one thing that makes a conversion so attractive. Combine that with a stainless steel exhaust tube from the 4-stroke down under the water, and you'll have a powerplant that sounds similar to an Eska 2-stroke. One thing I don't like about B&S's outboard is that they don't take the exhaust below the water level, and it's very loud because of that.

 

[Tommy Two Stroke]

Re: Briggs n Stratton Outboard

Now listen up an learn.....the original 5 HP b &s has a direct linkage to the trottle ...no little plastic bits and springs a big arm and a wire to the throttle ....No flaps just an electronic rev limiter that cuts the igniton at 4000 rpm ( this is why they are sold because out of water they seem to be missing ..on the water fine 3600 rpm loaded by the prop)

The timing is fixed no contacts a magneto with built in electronics.....thats why it wont idle lower than about 1300 ...its not a car you will not get 750 whatever you do ...flywheel mass etc to consider... It fires like a 2 stroke every tdc. if you fit a pit bike carb you will have easy cable to control throttle and an idle screw along with a 5 positon needle to adjust the mixture .
The gear ratio is 1 : 1.5 rather than the 2 ish on most outboards the prop is 8 x 8

The magneto with built in electronics isn't why it won't idle below 1300 rpm. I have a Briggs 3.5hp "Classic" that I retrofitted with a brand new B&S electronic magneto (removed old points/condenser/magneto coil) and it will easily idle down to 700 rpm or so. Briggs electronic ignitions can fire a spark plug at very low RPM's. The speed restriction is due to how the carb is set up. The old Briggs pulse-jet style carbs are more forgiving at low engine speeds than the float bowl style carbs used on Briggs Quantums and Inteks.

 

[mrcrabs]

Re: Briggs n Stratton Outboard

mrcrabs, pretty much all 4-stroke small engines have fixed timing

I know they do, I have several B &S engines on all of my lawn tools....I like them because they need very little maintenance, but the B & S outboards are just to heavy to loud and underpowered for me...I guess if your on a lake or pond its a way to go, there absoulutly greener...but I reject any marine engine with fixed timing becuase there dogs and the stay dogs no mater what you do to them. maybe alchol would be the exception but them again I don't know if I could drink enough to believe I had enough power to get where I was going with a B & S...LOL there starting to pop up cheap on CL and everybody I know who has one wants to sell it. Just to slow and heavy to be a viable outboard especially in fast water. And Eskas are no gas hogs, I'm running all summer on the same 6 gallon tank I started with.

I have built my first prototype of my version of the stoller module for the single and it works great, no mounting I just hang it inline....I had some trouble laying jumpers since the PCB had changed a bit since 1976 and I used a 1982 unit I got from mahtymaht, I need tp post athread on that but I think I will do that at the group.

cheers,

 

[mrcrabs]

Re: Briggs n Stratton Outboard

I've heard of people going out for hours on a single fill up of gas

yes but do they ever come back?, make sure you take your ores with that B&S convert LOL
http://www.youtube.com/watch?v=hTKeJbmxobQ&feature=related

 

[Tommy Two Stroke]

Re: Briggs n Stratton Outboard

A guy on Youtube put a B&S Quantum 6hp on an OMC leg and has had good results with it. That's a very reliable and powerful engine (I have the exact same engine on my mower - I replaced a worn out 6 year old Tecumseh LEV with the Quantum), so I think it would make a good outboard....the only thing I would do differently than what he did is to use a stainless tube to get the exhaust down under the water. This conversion seems like a much better way to go than to buy the B&S 5hp outboard. Granted, Eskas are not gas hogs compared to other 2-strokes (especially twins) but by comparison, they do use quite a bit more gas than a B&S 4-stroke of similar HP. I bought an Eska leg on Ebay a while back, and I plan to do this same conversion....B&S 6hp Quantum. Hope to do this conversion this winter.

Nice job on the Stoller module....looking good!

 

[mrcrabs]

Re: Briggs n Stratton Outboard

I have busted into a twin module and I'm loafing around Mouser looking for a cap to go in there, the older direct drive Eskas had a nice coupler for a 5/8 shaft...I have one....there should be lots of them out there....there robust enough they could be milled for a bigger shaft