Suzuki DF 2.5 running issues

[Iain C]

So it starts and ticks over fine, and it's also fine running at speed. But when I put it in gear, it tends to stall. Putting it in gear with the revs slightly above tickover seems to help, but is obviously not very mechanically sympathetic.

Any ideas? Does it need a fiddle on the carb settings? I recently serviced it myself (oil, gearbox oil and plug) hoping some of that that might help but it's no better.

Thanks

 

[Twister_Ken]

So it starts and ticks over fine, and it's also fine running at speed. But when I put it in gear, it tends to stall. Putting it in gear with the revs slightly above tickover seems to help, but is obviously not very mechanically sympathetic.

Any ideas? Does it need a fiddle on the carb settings? I recently serviced it myself (oil, gearbox oil and plug) hoping some of that that might help but it's no better.

Thanks

Either wait a little for it to warm up, or adjust the idle speed up a bit.

 

[John_P]

was it ok before you serviced it ? if so it maybe that the spark plug electrode gap is incorrect, this will cause a weak spark resulting in the problem you are having.

 

[Lightning]

I had exactly the same problem with a Yamaha 2.5 which turned out to be dirt in on of the carb jets.

 

[Lakesailor]

Yes, it sounds like it's a touch weak at tickover. Does it have an idle mixture screw?

Just checked. It doesn't have any mixture adjustment. Could be as suggested a partially blocked jet or float level too low

 

[Iain C]

It's a brand new plug...although in fairness I did not check the gap. I will do this...if I can find what it should be!

Re clearing the carb, is that a squirt of carb cleaner spray followed by a max revs/block the inlet procedure?

 

[davidej]

Sounds like fuel starvation.

Could be a jet needs cleaning but check the fuel filter and clean out the float chamber as well.

 

[WF36]

Had this problem on a Yamaha 4, needed a new carb.

 

[Iain C]

The engine is only a couple of years old with not that much use so hopefully it will be something fairly simple! But yes, it does sound like fuel starvation in many ways, similar symptoms to my first car when the accelerator pump on the carb was shot...

 

[Heckler]

The engine is only a couple of years old with not that much use so hopefully it will be something fairly simple! But yes, it does sound like fuel starvation in many ways, similar symptoms to my first car when the accelerator pump on the carb was shot...

Our californian friends stopped the use of a tickover mixture adjustment yers ago, so suzuki just have a ball pressed in to the hole where the screw goes. So mixture not adjustable BUT the jet is there if you take the float bowl off and use compressed air to blow the cack out that is giving you probs!
Stu

 

[DogWatch]

So it starts and ticks over fine, and it's also fine running at speed. But when I put it in gear, it tends to stall. Putting it in gear with the revs slightly above tickover seems to help, but is obviously not very mechanically sympathetic.

Any ideas? Does it need a fiddle on the carb settings? I recently serviced it myself (oil, gearbox oil and plug) hoping some of that that might help but it's no better.

Thanks

Mine also does this, changing the plug regularly definitely helps, I reckon on around 1 to 2 plugs per year on these small engines. I keep a spare in the o/b tool bag and in the boot of the car as I often find it just wont start one day.

Ken is right too, they do need to be allowed to warm up a bit or you can do the outboard choke/throttle dance to keep it running in gear. In the dead of winter it can be a bit worrying holding the throttle and clunking into gear, so I always start the engine in neutral before stowing the bags in the dinghy for the trip back to the slip.

 

[Dave_Seager]

As has already been said, it is probably poor spark or weak mixture.

However, have you checked that the propeller turns freely? I have visions of you completely overhauling the power head while you have a polythene bag around the propeller!

 

[johnny66]

So it starts and ticks over fine, and it's also fine running at speed. But when I put it in gear, it tends to stall. Putting it in gear with the revs slightly above tickover seems to help, but is obviously not very mechanically sympathetic.

Any ideas? Does it need a fiddle on the carb settings? I recently serviced it myself (oil, gearbox oil and plug) hoping some of that that might help but it's no better.

Thanks

I have problem with my Suzuki DF2.5 which looks like your. It runs poorly when it gets warm, even shuts down when it's warm. I have a question about the cooling, the exhaust is hardly pooring out water even when its in full throttle. How does your water exhaust looks like?

Second question; did the new spark plug help?

 

[johnny66]

I have almost the same problem with my Suzuki DF2.5. It stalls when it is warm.
I suspect the cooling since there is nearly no water coming from the exhaust. Do you have the same experience?

Did the new sparkplug help?

 

[Goldie]

So it starts and ticks over fine, and it's also fine running at speed. But when I put it in gear, it tends to stall. Putting it in gear with the revs slightly above tickover seems to help, but is obviously not very mechanically sympathetic.

Any ideas? Does it need a fiddle on the carb settings? I recently serviced it myself (oil, gearbox oil and plug) hoping some of that that might help but it's no better.

Thanks

I'm watching this thread with interest - same engine, same symptoms. Thanks Iain!

 

[SpottyDog5]

Have you opened the fuel cap vent ?

 

[snooks]

When I had one on test it would do this every single time.

I spoke to another owner who confirmed theirs did the same. They solved it by replenished the old petrol with new petrol and it helped.

So use fresh petrol and see what happens, failing that you're the 5 th the suky owner I knows this has happened to.

 

[Iain C]

Fuel is new, and yep, the vent is open! Prop is free to turn fine, plug is brand new. There did seem to be some oil around the carb intake so I'm going to squirt some cleaner in there and see what happens.

It's odd, it's been fine for the two years previous since it was new...

 

[makingplansfor]

I bought the same engine at the start of last season and one of the dealers tried to warn me off the engine as it is apparently well known to "run lean" whatever that means?? I decided to buy it anyway because it is significantly lighter than anything else. Although it starts well, I have learned to leave it idling for quite a time and you always need to be careful how quickly you put the revs on. It did get a little better after a couple months but I guess I have learned to live with its quirks....

 

[seadog30]

Warning Same Problem !

Same engine same problem. Our had the same issue from new, I tried new plugs, new fuel, carb strip and clean etc etc

The only answer was to give it 5 mins fast tickover out of gear to warm up out of gear.

Warning, if however like me you rush things and slam it in gear at high revs to stop it stalling eventually you will "mash" the gears and dog clutch. The replacement shaft, gears etc is approx £250 !!! not including labour.