Yamaha LS 2000 engine quit

[iwant2h2oski]

I installed a new SBT engine in my 98 ls 2000, ran it in my driveway on the hose, idled a little roughbut I was going to adjust it at the lake. Next evening took the boat to the lake, both engines ran great rpms matched ran at an idle for a while let it get good and warmed up idle smoothed out in water with the resistance on the pump. this was all in preperation for a long weekend at a big lake not close to home. Saturday put the boat in the water both engines started instantly and we ran around the lake skiing and horsing around for about 4 hours, starting and stopping running at all different rpms with no hiccups. went to the marina to swap out some people and headed back out to the open water, lost a hat in the process circled around and shut down the boat to get my hat and the new engine would not restart. Thought was flooded so let it set for a while no luck, pulled plugs they were a little fould, engine tries to fire and then goes to cranking, same the next day after letting it set. Any ideas?

[dank]

Re: Yamaha LS 2000 engine quit

Make sure the lanyard is the correct type. I had the same problem when I tried to use a Kawasaki lanyard clip.

[skraggy]

Re: Yamaha LS 2000 engine quit

Sounds like it wasnt broke-in....Run a compression test to start.

What does it sound like when you turn it over ?

Is it still running oil from the pump ? Or premix ? If pump.....Did you add oil to the fuel tank to give yourself the added oil needed for breakin ?

If you removed the pump and its lines....Did you prime the pump after installing the motor ?

What caused the previous failure ? Was it corrected ?

[iwant2h2oski]

Re: Yamaha LS 2000 engine quit

last engine threw a rod has oil injection and I mixed the break in oil with the fuel I haven't done a compression test as of yet but it on my agenda. when cranking it sounds good and has some compression. there is a lanyard but the other engine is running just fine.

[David3aces]

Re: Yamaha LS 2000 engine quit

Check switch on clean out plug lid. Switch controls both spark and starter.....

[iwant2h2oski]

Re: Yamaha LS 2000 engine quit

Ok I did a compression check last night and all 3 cylinders are at 110. I removed the flame arrestor and verified the oil injector is working, primed all 3 cylinders and attempted to start no go, it is firing for a moment and then it goes back to cranking. Plugs are fowled looks like lots of oil on them. any ideas?

David3aces I dont think it is the switch on the cleanout lid, because it cranks and the other engine still runs no problem and I think there is only one switch there that controls both engines.

[Technical Support]

Re: Yamaha LS 2000 engine quit

OK first of all - what repairs were done to fix the original problem? You obviously didn't do a proper break-in as far as taking it easy - what EXACTLY did you do as far as -premixing the first tank of fuel? How much oil, how much gas, etc.?

Does your model have one or two batteries? If two, swap them and test. Have you tried fresh plugs?

[David3aces]

Re: Yamaha LS 2000 engine quit

I have seen two switches on those twin engine models......

[iwant2h2oski]

Re: Yamaha LS 2000 engine quit

I will check to see if there are two switches when I get home, I am also going to try new plugs it only has one battery. I mixed the fuel with the SBT break in oil, I went by the chart on the back of the bottle for mixing.

[skraggy]

Re: Yamaha LS 2000 engine quit

I have seen two switches on those twin engine models......

Same here...

[David3aces]

Re: Yamaha LS 2000 engine quit

Have someone hold down both switches while cranking. Insert something thin over switches before closing lid. I have seen just by stepping on lid will cause switches to go off.........

[iwant2h2oski]

Re: Yamaha LS 2000 engine quit

you were right there are 2 switches, I checked the switches by opening the clean out lid and tring to start, the engines would not turn over no cranking, close the lid and both starters work and the port engine will run.

I installed new plugs and tried to start no luck, ran the battery down, put the battery on charge and pulled the plugs to let any excess fuel evaporate, The engine attempts to start for a moment when I first turn the key and then resumes cranking.

any ideas

[David3aces]

Re: Yamaha LS 2000 engine quit

work the switches a few times by hand. Then have someone slowly work switch while you hold key in start position...........

[David3aces]

Re: Yamaha LS 2000 engine quit

Follow the wires from electrical box to where they plug into boat wire harness. Unplug black wire connector that has one black and one white wire. Make sure this connector comes from dead engine. With this connector unplugged, it should spark all the time. If Dead engine now starts, you will have to reconnect connector to kill engine. IF this works you have either bad lid switch or bad key switch or bad wire harness....only do this if you feel capable in doing so......When white wire is connected to the black it kills the spark and the switches control these wires.......

[iwant2h2oski]

Re: Yamaha LS 2000 engine quit

I will give it a go during lunch.