Suzuki 70hp 4 Stroke no power over 3000rpm

sovereignrach · 30 May 2014, 09:48

Hi, took our rib out for a spin last night and once clear of the harbour I put the throttle on but there was no power. When the throttle was on full It would not rev to more than 3000rpm and hit 7 knots max. It idles fine and is ok at low speed. My boyfriend has checked the engine and everything appears to be as it should be. There are no engine lights or other warning signs. Has anyone else experienced this? Any ideas? Thanks.

two stroke mick · 30 May 2014, 09:55

Is the boat full of water under the deck?

sovereignrach · 30 May 2014, 10:37

It could be! How would I know? (very new to ribbing!) the auto bilge isn't working and due to the rain it has been filling up (although I've been emptying regularly)

henryfreston · 30 May 2014, 10:40

know this sounds really simple, but i was out on my searider last weekend and I was bouncing around and I suddenly lost all power (similar symptoms, had no power and wouldn't rev above 3000 rpm etc.)

I took it in and found that one of the HT lead heads had come off the spark plug. I would double check yours even if they look in place as they could be lose?

Henry

henryfreston · 30 May 2014, 10:41

Quote:

Originally Posted by sovereignrach

It could be! How would I know? (very new to ribbing!) the auto bilge isn't working and due to the rain it has been filling up (although I've been emptying regularly)

there should be a drain plug at the bottom of the transom (at the bottom of the V) You can screw this out and water will drain from inside the hull.

gary222 · 30 May 2014, 12:32

To check it's not the engine see if it revs normally in neutral while the boat is still?

henryfreston · 30 May 2014, 12:39

Quote:

Originally Posted by gary222

To check it's not the engine see if it revs normally in neutral while the boat is still?

An engine can rev normally when in neutral, but when put under load can act completely different.

whisper · 30 May 2014, 12:52

Is it due a service and cut down on the revs, if so you can reset it. Worth a look

gary222 · 30 May 2014, 21:18

Quote:

Originally Posted by henryfreston

An engine can rev normally when in neutral, but when put under load can act completely different.

yes but if it doesnt rev even in neutral then its likely engine related .

treerat · 30 May 2014, 21:22

Suzuki engines have a safe / get you home mode. Chances are an engine service is needed as a plug will be down, carb gummed up etc,

Bigtalljv · 30 May 2014, 21:58

And they have a neutral rev limiter at around 3000. At least my 2005 250 did.

Jason

sovereignrach · 31 May 2014, 21:57

Thanks for all the replies. The engine was serviced last August (with previous owner) I've spoken to a Suzuki specialist at the harbour and he seems to think it is fuel related but is going to take a look at it when he can fit me in. I took the rib out again today just to see if I could notice anything else and she was taking in a lot of water which wasn't previously happening. I just hope, whatever it is, it's not too costly to fix!

sovereignrach · 31 May 2014, 21:59

Quote:

Originally Posted by henryfreston

there should be a drain plug at the bottom of the transom (at the bottom of the V) You can screw this out and water will drain from inside the hull.

The boat is currently in the water so I can't check this!

jumpinjack · 31 May 2014, 22:42

Quote:

The boat is currently in the water so I can't check this!

If there is a chance the bung is out, it would be best out of the water!