Rough Running & Cutting Off

[baconbiscut]

I'm usin a friends boat for a few weeks because our boat is in the shop for fiberglass work. Anyway it was nice of our friend to let us his 23ft John Allmand. Anyways it has 225 HP 2 stroke Fuel Injected suzuki. This morning I went out to go fishing and i started it up. i was about 50 degrees outside but it cranked right up. I let it warm and we loaded our gear and headed out. about ten yard from the dock and about 20 minutes of idling it died. So I put throttle up and cranked up the engine to blast the carbon out of the cylinders thinking that the plugs were fouled. It staeted up and and ran alright. later on that day while idling a 1200rpm it cut off again. i started it back up and along we went at idling pace. Since i have an IO and not a V6 outboard i'm not use to the way they run. It seems to me that all V6 two stroke outboards have that rough running sound. as we were going along I decided to trouble shoot the engine while at an idling speed. I put my hand on the cowling of the motor and it was running smooth then all of a sudden it would shake like I was dropping a cylinder or two. However at speeds above 1700rpm it runs smooth and dosen't die. I figured that the oil injection system is running to rich. Any help would be great.

Thanks, Dan

 

[rodbolt]

Re: Rough Running & Cutting Off

its sick
ya need to get it well agian before further use or it may die.
what your describing is a lean condition.
could be due to fuel contamination,lack of fuel to the rail or dirty injector filters.
I would start by carefully checking the hull water seperator and the engine filters.
modern 2 stroke outboards,if running correctly will idlefor hour after hour.

 

[baconbiscut]

Re: Rough Running & Cutting Off

what are other symptoms of running lean? When Iwas running the engine at idle I looked at the exhaust water coming out the back and it was sputtering out unused two stroke oil. that doesn't seem like it is running lean to me. However, I should have told you that to begin with my bad. It would also smoke just like an old carbed two stroke at idle to. I do beleive that this is one of the first fuel injected two stroke engines. so perhaps the technologie back then wasn't all that much greater than carbed. It runs fine at planing sppeds and it runs fine at idle ost of the time but then some other times it just shakes and sputters out. and some times it will shake and keep running. I aapreciate the help form this site and don't like to question many of the members authority but I just wanted to bring variables into consideration.

Thanks,Dan

 

[rodbolt]

Re: Rough Running & Cutting Off

the shuddering can be anuthing, but the oiling system on the suzuki is very reliable.
its EFI not DFI so you are still burning a fuel oil mix introduced in the intake manifold.
suzuki electronics are very reliable.
usually its trash in the fuel or a clogged filter.
but either way its trying to tell you its sick.
take it to a Dr.