Yamaha 90 Cutting Out

[rads]

Had the small boat out over the weekend (Ribcraft 5.85 with a Yam 90 2 stroke). As a bit of background, this boat has always seemed a little under powered / over-propped as with a decent load of divers and kit on board, we only get 4400 at WOT and approx 25 knts.

Anyway, 3 or 4 times over the weekend, the engine cut out whilst running flat out at full throttle. The cut out was instantaneous, no spluttering, as if someone had thrown a swith (so suspect electrical). Fortunately, and slightly oddly, the the engine would start back up and run completely normally as soon as the ignition switch was turned, making a diagnosis of the problem difficult.

Anyone had anything like this before?

David

[Jeff]

It may be worth checking the main fuse in the engine to see if it or the holder is corroding and the vibration causing a break in the circuit? We had a problem on our club's old Yam and I seem to recollect it was an in-line glass fuse/ holder and it was only held together by the rubber shroud.
Jeff

[Swifty]

Yep go with that. Also had trouble with kill chord switches -usually the wiring behind the switch, or the ignition switch itself.

ATB
Tim'mers.

[Paul F]

check stop circuit wires a chaffed wire earthing out would cause it.
Paul