Nearly new yamaha 115 won't start

[moore288]

Hi can anyone give me some advice. I just got my new rib and went to launch it for the first time and the engine won't fire. Checked all the usual - kill cord, immobiliser, fuel - but nothing. Does not fire at all? Anything obvious I am missing. It just came from a service where it was running perfectly ??? I can of course get yamaha out but wanted to check first if there was something stupid I am not doing - primed, immobiliser off, kill cord in, in neutral .... And nothing? All ideas welcome... It is a 2011 engine with 45 hrs.

[ShinyShoe]

Might be a dumb question - battery isolator switched to on?

I'm used to using club boats where its usually left in the on all the time. Gets me every time when someone switches it off! Just wondering if the service boys have switched it off?

To get a diagnosis you'll need more info. You say does not fire does it turn the starter motor? Or turn the key and complete silence?

Other classic stupidities: air vent on fuel closed (usually would run then die). Engine in gear. Battery disconnected.

[Adamn]

OK
1,Battery OK with power?
2,Kill Cord in correctly?
3,immobiliser defiantly not causing a problem. Is it key operated if so is it working.
Does it turn over or is it just dead?

[spartacus]

Fuse possibly? Check out page 79 of the online manual (not page 79 of the PDF)... http://www.yamaha-motor.com/assets/s...07-13_1370.pdf

[moore288]

Thanks all - the engine turns over fine so their is electrical power- just does not start . I am thinking immobiliser issue?

[moore288]

Ok so now it is fixed , thanks all for your help. Battery needed replacing . Cranked it well to the ear but obviously not enough to fire. Jump start worked straight away.

[Leapy]

Originally Posted by moore288

Ok so now it is fixed , thanks all for your help. Battery needed replacing . Cranked it well to the ear but obviously not enough to fire. Jump start worked straight away.

Unless there's an explanation here that I don't understand I'm not sure how a battery capable of providing (seemingly) good cranking speed - and presumably therefore good cranking amps - cannot power the engine management system too. Usually, it's the reverse ... a poorly charged, tired or life expired battery cranks the engine over real slow but the engine might still struggle to life.

Back in the day, one of my favourite expressions ... "There's no such thing as single root cause"*. Could be the case here?


* Course there is, but it kept folks on their toes.

[moore288]

Yes it is a mystery. I do hope this is all the problem was. I was told by yamaha over the phone that these engines needed a tip top charge to start. I ruled that out at the time as the cranking sounded good, but I am not an expert (as you can tell!). All I can say was 10 hours later with the jump leads it immediately leapt to life... Did I so something else wrong ? possibly. I hope I did and that there is not some hidden trauma .

[PeterM]

The optis are the same, can crank for ever but not fire...something about the cranking dropping the current so low the ecu won't provide a spark.

[Chris]

Yep same with E-tec, the voltage drop when cranking prevents the electronic fuel injection kicking in properly.

[captnjack]

Weird, 115hp is a bit large but how do they pull start then?

[br1anuk]

We had the same problem with our Yamaha 50hp efi. It was turning over OK, but would not start, as soon as we connected a charger pack it fired into life.