Dt115

[64shakers]

Have a Suzuki DT115 2 stroke that is giving us (myself and mechanics) a fit. At slow idle, the motor will just cut off just as someone cut the ignition switch off. It will also do this at WOT. No sputtering, spitting etc. Marina mechanic has replaced: kill switch; ignition switch; check fuel pump and replaced diaphram; replaced plugs and check flywheel sensor. Nothing seems to fix the problem. Anyone had this issue before? It's prime fishing time here in the Carolinas and I'm hesitant to take the boat out anymore. Disabled Vietnam Vet and can't afford to repower at this time. HELP!!

 

[64shakers]

Re: Dt115

Forgot to add to previous post: engine normally starts right back up but lately I've had to wait about 5-10 minutes before it will restart.

 

[Marion Moore]

Re: Dt115

This is a WAG but if it is an EFI what about the throttle position sensor?

 

[64shakers]

Re: Dt115

Forgot to mention that also. Mechanic pulled plastic cover off flywheel and took sandpaper and cleaned sensor. Had little corrosion on it. How else can you check the tps other than by sight? Is there a voltage or ohm test that can tell if it's bad or not? Thanks for the reply...one mechanic kept mentioning this could be the issue but again all he did was hit it with a piece of sandpaper and put the cover back on.

 

[Knightgang]

Re: Dt115

You want to seen out a member that goes by Rodbolt. He is helpful with these engines. he has helped me out.

Have all of the electrical connections been checked and the coil packs tested. How about the resistance of the coil wires? I ask because I have a DT115 and I had some issues with the coil wires, they needed new caps put on. I have had mine skip a bit, but I think now that it mightbe prop slip.

Is your oil injected? What year? You could have sludge builup in the oil system reducing flow and the flow sensor is shutting the engine down. Just a thought, I am not sure if it self preserves or not. Mine does not, but I do have a low level alarm on the oil system.

 

[robert graham]

Re: Dt115

Maybe consider a fuel delivery issue rather than electrical? A faulty primer bulb, fuel pump check valves, air leaks at quick disconnect, etc. could cause motor to stop abruptly. Maybe worth a look-see before spending a pile of time and money looking for electrical issue? Good luck and keep us posted with results!

 

[Knightgang]

Re: Dt115

Maybe consider a fuel delivery issue rather than electrical? A faulty primer bulb, fuel pump check valves, air leaks at quick disconnect, etc. could cause motor to stop abruptly. Maybe worth a look-see before spending a pile of time and money looking for electrical issue? Good luck and keep us posted with results!

I did just read another post from a guy that was having a a similar issue and his turned out to be the fuel connector. For a quick fix, he took the engine cover off, and ran the fuel line directly to the fuel pump, by passing the engine fuel line connector and the problem went away. So, he ended up replacing the fuel line connector on the line and engne... So, it is possible that you are getting air in your line somewhere and causing the shutdown. In combination with this, you might want to clean the carbs as a precaution.

 

[James R]

Re: Dt115

I am in Monroe NC.
I have worked on these motors for sometime.
First what is the year of the motor.
This will give me some idea as to what may be wrong.
If it is the TPS just disconnecting it will change the situation. The motor will run just fine without it but the rpm transitions will be affected.

 

[sigma]

Re: Dt115

Have you checked the starting battery for it's conditon? Yes it may crank and fire but a weak battery and modern computers don't do well together. A low voltage to the computer can do some interesting things.

Just an idea.

 

[64shakers]

Re: Dt115

Thanks for all the replies. The engine is a 1999 Suzuki 2-stroke DT115 EFI. It also has an oil reservoir that automatically mixes with the gas. TPS is what the mechanic I'm working with has suggested. He is supposed to do an OHMS test on it tomorrow. I'll suggest disconnecting it and see if that solves the issue. I will also do a battery check. It is possible that I could have a bad cell in one of my batteries. I have two hooked up now. Also, I will try hooking up the fuel line directly to the fuel pump. Again, thanks for the help. Hopefully, we can get this thing running again. When it's running, it runs great.

 

[waffles1]

Re: Dt115

64shakers, when this engine dies and you try to fire it back up or you getting any fire at all? or is it just like the key has been turned off? If it's a fuel issue most of the time it'll fire but win't start because of lack of fuel. Is it trying to start or areyou getting no response what so ever?

 

[Marion Moore]

Re: Dt115

Have you heard anything from your mechanic? Are you by chance using Charleston Marine? If so, I hear a lot of good things about Chris V. on the Charleston Fishing web site.

 

[64shakers]

Re: Dt115

When the engines dies, it's like someone just turned the key off...no spitting or sputtering, etc. Until recently, the engine would fire right back up. Now it is firing but will not start until it sits there about 5 minutes...then it will start.

 

[64shakers]

Re: Dt115

Thanks for all the help. I think the problem has been identified. There is a short in the motor in the high pressure fuel pump. This would explain it cutting off and then taking a few minutes to cool off before it starts again.

 

[Marion Moore]

Re: Dt115

I sent you a PM. I have located a used HP fuel pump.