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Old 30 June 2009, 08:44   #1
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From idle to full throttle --> engine shuts off

Hello Rib/Sib'ers

I do my best to explain my "problem" in the best englisch I can.

Engine: Suzuki DF5 (4stroke) 2007 - bought new in 2008. runtime now: 30 ours.

Last year the engine worked perfect, without any problem. Before i used it again it had a servicing at a suzuki dealer. They did the common things, and also set the idle RPM a bit lower, cause it was a bit high.

When i now suddely turn the gas from idle to full throttle, the engine lowers in speed making a deep BOOOOP sound and shuts off. When accelerating to full throtltle a bit slower, the engine runs good.

Is it normal to shut off when giving a suddenly full throttle from a low rpm?

Greatings from holland!
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Old 30 June 2009, 08:54   #2
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It sounds like the carburettor has been wrongly adjusted, and the sudden change in throttle either floods or starves the engine so it stalls.
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Old 30 June 2009, 08:54   #3
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Quote:
Originally Posted by Glaerox View Post
Hello Rib/Sib'ers

I do my best to explain my "problem" in the best englisch I can.

Engine: Suzuki DF5 (4stroke) 2007 - bought new in 2008. runtime now: 30 ours.

Last year the engine worked perfect, without any problem. Before i used it again it had a servicing at a suzuki dealer. They did the common things, and also set the idle RPM a bit lower, cause it was a bit high.

When i now suddely turn the gas from idle to full throttle, the engine lowers in speed making a deep BOOOOP sound and shuts off. When accelerating to full throtltle a bit slower, the engine runs good.

Is it normal to shut off when giving a suddenly full throttle from a low rpm?

Greatings from holland!
Have you checked to make sure there is no problems with the fuel supply ie kinked etc that could be restricting the flow of fuel to keep up with the extra sudden demand from idle to full throttle?
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Old 30 June 2009, 09:02   #4
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The engine sounds like it get to less fuel at suddenly acceration, i think this because the low deep sound.

Those engines dont got a air filter, so i can imagine that it just get full air, but the needed fuel dont reach the cillinder yet, so it shuts off.

Is it possible to adjust the mixure setting only at low rpm? the engine runs perfect at +/-1000rpm and higher. When suddenly accerate from 1000rpm to full, it works fine.

I used the internal and a external tank.
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Old 01 July 2009, 05:27   #5
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A weak hole in the progression probably caused by too weak an idle mixture and/or too low an idle speed. When the throttle is opened suddenly, air rushes into the carburetor but the fuel is heavier and has more inertia so it is a little slower at moving. Carburetors use various means to overcome this but, in your case, since the engine accelerates fine from 1000rpm my guess is idle mixture too weak.
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Old 01 July 2009, 10:31   #6
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I had exactly the same problem with my DT25, and I'll second Jwalker's thoughts.

The easy way to test is next time you are out & whack the throttle open from idle, "blip" the choke - this will draw more fuel into the mix then it should accelerate nicely (don't leave the choke out or you'll flood it!) If it stalls then you may be too rich a mix, but I would expect a bit of smoke if that was the case.

Hopefully a Suz guru will be along shortly to tell you where the adjuster screw is!
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Old 02 July 2009, 06:07   #7
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Thanks all!

Yes, it really lookes like the engine dont get the fuel on time to increase rpm. When I am out again, i will try the choke.

If i post some photo's of the carb, does someone think we could locate the idle screw?

Greatings!
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