AVON - cutting out

SteveA · 01 May 2004, 23:46

We've got an AVON 346 jet RIB as a safety boat and recently it has started to cut out occassionally, then it can be restarted straight away. It's a sudden cut out - like maybe electrical? but when I contacted AVON to get a service manual to try and trace the fault they told me that there never was one for this model. It's fitted with the Yamaha 63hp oil injected 2 stroke engine. Has anyone had similiar problems? and how was it fixed?

Rene · 03 May 2004, 08:48

Hi Steve

I don't have your kind of boat, but is this happening at full speed or idle or both ?

Check for leak in fuel line, if you have a tear in this the fuel might not be leaking out, but the engine could be taking air in.

I'm not sure if this is electrical, since the two stroke engine is quit simple (Did I say something wrong here

)

Please give some more information... Can you provoke this to happen...
Regards
Rene

SteveA · 07 May 2004, 10:10

It tends to happen at full speed. We have checked the spark and it appears to be very weak. I'll have to ckeck further into this. I will also have a careful look at the fuel line. What is annoying is that the boat was O.K. until we had it serviced! - the problem has only been since then. (don't really want to take it back to the service agent as they are 200miles away!).

Daniel TD5 · 07 May 2004, 11:26

Sounds nomal to me most things go wrong after a sevice ring the dealer and
have a go at him not saying he has done some thing to it but thats my bet
my truck was ok for a year went in to main dealer and lots of over heating
problems after why did they charge me for changing the antie freeze on a year old motor ???? don,t think they bled it after the change

Andy · 07 May 2004, 12:43

We had exactly the same symptons, and it was due to fuel starvation. The fuel line as it exited the engine into the fuel filled heavy bulb was flapping and kinking the line against the plastic protective wrapping, fitted by the manufacturer. We noticed that as the engine cut out the bulb had effectively collapsed as the engine sucked it dry ... and obviously the line below was kinked stopping more fuel in to replennish that used. This was only apparent when we threw the boat around lots causing the bulb to swing about, or at top speed when the bulb was blow by the wind causing the kink. The fix was very easy, we just moved the plastic wrap and tied the bulb up so it did not flap. The stopped kinking and hence fuel starvation. I hope you problem is as easy to solve. See diagram attached.

SteveA · 08 May 2004, 08:56

Many thanks for the ideas - I think I'll look into the fuel supply side first. Can't get to it until next week - work gets in the way!