Suzuki 50 (1973) fuel problem

[rango2000]

Bought this spring. Two cylider, Two carb. Ran great 1st time out. Forgot to disconnect fuel line and suspect fuel pressure from hot sun bent tang on float as was leaking gas out of carb. adjusted float to stop blow-by, take it out to lake. Idles fine, even at full rpm (throttle wide open), in gear, under load, top out at 5 mph wide open. Since symptoms of flood are roughly the same as air lleak in fuel line where should I look? Bulb will leak a bit if I really pu the squeeeze in it. ( Around the nipple} Bulb has fitting in each end held in with spring clamp. I,m baffled. Any I-dee-ers?

 

[45_red]

Re: Suzuki 50 (1973) fuel problem

Try choking it ;if it's flooding it will die, if it's starving it may rev up a bit.

 

[rango2000]

Re: Suzuki 50 (1973) fuel problem

Choke it , It dies.

 

[Knightgang]

Re: Suzuki 50 (1973) fuel problem

As I have come to realize with these outbaords, if you suspect a fuel problem (or have one) there is no substitute for a rebuild. I know that not all carbs are the same, but I would guess that most of them are pretty simple. It may be a little over kill, but do a rebuild, check all of the specs like float levels and jet adjustments, and then see how it runs. Can't hurt.<br /><br />Knightgang

 

[jim dozier]

Re: Suzuki 50 (1973) fuel problem

Leaving the fuel line disconnected in the hot sun won't bend the tang on the float. It doesn't work that way. I live in Florida and I never disconnect the fuel line and the boat is always in the sun. More likely the float valve got stuck open due to some crud or was maladjusted. You should have replaced it and reset it to spec. They are relatively inexpensive. I would go back in and do a proper clean and rebuild of the carb. The same crud that may have stuck the float open may now be in your main jet.<br /><br />Symtoms of flooding (too much gas) are not the same as an air leak (too much air). A rich condition will cause rough running and burbling. Spark plugs will be black. Choking it will worsen a flodded engine. A lean condition will cause the engine to spit back. Spark plugs will be light colored or white. Choking it will improve a lean engine.<br /><br />Never give an engine full throttle unloaded in neutral. Bad things can happen and it doesn't tell you anything. Multi cylinder 2-strokes will overrev on just 1 cylinder. Examine the engine in gear under load. <br /><br />Your fuel bulb should not leak, even a little. If its leaking gas it could be leaking air under vacuum.

 

[rango2000]

Re: Suzuki 50 (1973) fuel problem

Pulled out what I assume is the mixture screw (on front of the carbs above choke plate). The point on the top one is slightly worn and bent.Am I on the right track?

 

[Knightgang]

Re: Suzuki 50 (1973) fuel problem

That screw that you pulled out is the pilot iddle screw. The fact that it is bent may be a factor but I do not think so. That screw should be screwed in until lightly seated and then backed out about 1 1/2 to 1 3/4 turns.<br /><br />I suspect that if this was your first year with the boat, that the carbs need to be cleaned. Contact Brown's Point Marina (www.brownspoint.com) and have them send you the carb kits and you can talk to them about the bent idle screw. Once you have cleaned the carbs, you will see a difference (and you will learn a bit about the way they work).<br /><br />knightgang

 

[jim dozier]

Re: Suzuki 50 (1973) fuel problem

Your problems are probably not confined to the bent screw. I would think that the bent screw would make it difficult to get the idle mixture right and it would be simple to replace. The normal procedure is to gently seat (screw in) the screw and then back it out the book specified number of turns. However the bent screw may damage the seat if you screw it in and I would suggest that you don't. This screw is the idle air mixture screw. Unscrewing it (counterclockwise) lets in more air and leans out the mixture. I agree with Knightgang a complete carb rebuild is in order.<br /><br />While you are at it, I suggest you rebuild the fuel pump diaphragms which are simple and inexpensive. <br /><br />Before you go any further with any of this, go to the bottom of the page and order a manual, an absolute necessity for even the most experienced mechanic.

 

[Knightgang]

Re: Suzuki 50 (1973) fuel problem

I hope you are still watching this tread. I also have to agree with rebuilding the fuel pump as well. I just rebuilt my carns and the fuel pump on my DT115. You would nto believe the amount of garbage that was in the fuel pump. And I could tell a big difference between the old diaphrams and the new ones. I could not beat that $17 kit.<br /><br />Check with Browns Point and have them send you a replacement for that bent screw as well.<br /><br />Knightgang