Suzuki 2.5 cutting out

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mick

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My brand new Suzuki 2.5 (a few hours running) tends to cut out when the throttle is opened, even after the recommended 5mins. (!) warm-up. I have been told this is a common problem with this outboard and the solution is to run it hard for 3 hours. Any advice would be appreciated.
 
Take it back and get a Mercury 2.5hp.

Mine is faultless, requires virtually no warm up and doesn't misbehave. this isn't really acceptable is it?
 
mick said:
My brand new Suzuki 2.5 (a few hours running) tends to cut out when the throttle is opened, even after the recommended 5mins. (!) warm-up. I have been told this is a common problem with this outboard and the solution is to run it hard for 3 hours. Any advice would be appreciated.
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Mine has worked without fault since day one. Are you following the "running in" suggestions.

A super wee engine.
 
My suki was reliable. It would reliably cut out as soon as we pushed off from the mother ship and gave it some revs.

I got into the habit of starting it as soon as I got in the dinghy, then by the time we'd sorted ourself out it had warmed up nicely, but I'd still be ready to restart it if necessary.
 
Maybe a bit of dirt in a carb jet.

Maybe the mixture setting needs tweaking a bit.

But don't mess with it if is brand new. Take it back to the dealer to get it sorted.
 
I find my Suzy 2.5 short shaft 4 stroke works great, even though I tried to drown it a week after buying it.
If cold, turn on the petrol bits, choke on, throttle off, pull it once (maybe twice), it starts. I turn the choke off straight away. Put it in gear, it doesn't stall, even completely cold. I will then open the throttle a bit and as the engine warms raise the revs in stages to give the engine time to warm through. The engine works really well.
When I am flushing the engine through after using it in salt water, I have noticed that the level of water around the engine does affect how it runs, the back pressure will vary and if the prop isn't very far in the water the engine does hesitate. If the engine is immersed a bit deeper the hesitation goes away. I presume that if your transom is a bit higher the tuning of the motor can be tweaked to eliminate the hesitation.
 
Make sure the vent in the fuel cap is err... venting! as this would cause fuel starvation. Cannot see that running it hard would help, other than getting it up the temperature maybe. I have just bought one of these and it runs like a dream and I do not hammer it, just potter about. These small outboards can suffer from blockages in fuel system as their components are so simple and tiny - the smallest bit of muck can block a capillary. Does it start again straight away at tick over and do you find it will rev again if you put the choke on? If so, its likely being starved of fuel somehow via the main jet. As others have said, if its new and not even had its first service at 10hrs, take it back to the dealer.
 
After further use, I find I can use the motor happily enough if I give it ttime to warm up and open the throttle gently. Thanks again.
 
mick said:
My brand new Suzuki 2.5 (a few hours running) tends to cut out when the throttle is opened, even after the recommended 5mins. (!) warm-up. I have been told this is a common problem with this outboard and the solution is to run it hard for 3 hours. Any advice would be appreciated.
Click to expand...

We have had ours for two years now, always needed 5 mins warm up but found as time went on it would stall when opening up the throttle, by this time it was out of warranty. I now from cold, start with choke out and no throttle,it starts 1st or 2nd time, I put it in gear with choke out then as i put on the revs put the choke all the way in at the same time, this way it seems to work fine. I have tried cleaning the carb, jets and injectors and even drilled out the blanking plug to get to the mixture screw but still can't get it to idle well after closing now the revs quick, instead i have to back off slowly. After trawling the web I think it seems a lot of people have these issues, I have learned to manage around it, not ideal, unfortunately i
 
VicS said:
If there is no adustment screw you cannot unless there is one accessible by drilling out a blanking plug.

Something you should ask your dealer about or to sort out at the time of its next service.

I take it screw 13 in this diagram is not a mixture adjustment

http://www.brownspoint.com/store/pc/suzuki/images/df2_5/03/fig005.jpg
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Screw 13 in the drain screw for the carb bowl. The mixture screw is as you said behind a blanking plug,there is a you tube video of a guy doing it. I drilled it out and spent quite a few hours trying to get the mixture right for idle and throttle making very small adjustment each time, it still is far from perfect. Quite a few people have said that the injectors are too small and it was suggested suzuki had gone up one size or at least made them available as a fix for dealers. I would let the dealer sort it while its in warranty.
 
A most interesting thread as my Suzuki 2.5 suffers the same problem every so often as well. It also ticks over quite fast IMO. Tis due into Ron Hale Marine in the next week or two for it's first service so will raise the point with them and report back.

By the way we all religiously drain our carbs with screw 13 after use as instructed in the manual don't we?!!! ;):rolleyes:
 
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Has anone got the very lastest 2013 version of the engine that has this problem? With the bushed prop instead of a pin etc. Just wondering if this apparent fault is still there on the latest editions?

Mine has done about 6 hours and starts instantly on the choke, which is opened straight after it starts. It operates normally immediately, does not need warming up hardly and doesnt fluff out if the throttle is snapped open.
 
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Not to worry. I have similar problem with same . To meet emission standards they have a very fine jet which cant supply enough fuel when the throttle is opened
quickly. The carb. is sealed and is not adjustable. The answer is to tighten the throttle grip so as you cannot rev. like a motorbike. I'm just getting used to mine so no longer a problem. (Info provided by Suzuki service chap.)
hope you relax now :-) : -)
 
I have never drained mine with Screw 13 yet, once I get home, I stick it into a wheelie bin full of fresh water, start the engine, let it flush it's passages out of the salty stuff and then leave the engine idling with the fuel shut off, until it stops. I presume that leave the carb empty.
 
I'll persevere for the rest of the season and if necessary I'll let the dealer sort it then. Nice to know there's a 5 year guarantee. Thanks again for comments/suggestions.
 
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