Doesn't miss a beat
Now 7 years old, my DT40 hasn't missed a beat. Serviced every two years just fill it up and go. Quicksilver oil has worked fine. My DT40 starts first time on cold starts at the ramp, just give it revs and choke. Not the most fuel efficient or quiet motor but it is a two-stoke and a good option if you are after something cost-effective and reliable. Saying that tho, I would always recommend a 4-stroke over a two stroke especially at 40HP and above due to efficiency and convenience with refuelling.
Maintain and be rewarded
Had some teething trouble with this old bird, poor maintence by previous owners the cause.
Keep the fuel fresh and clean, use fuel stabilizer and quality two stroke. Clean your fuel filter regularly and check for debris and water in it. Clean your carb out thoroughly. Remove the carb, float bowl, float, fuel inlet valve, lower main jet, top idle jet and air screw. Blast it out with compressed air. Check the small holes on the jets for debris - the usual cause of idle problems.
Reassemble with the air screw 1.75 turns out and use the idle...screw to get revs right. Mess about with small adjustments whilst the motor is running. Renew plugs regularly and keep leads clean and sprayed with water repellant. Keep gear oil clean and watch for any sign of creamyness - water getting into oil. Change oil seal if this happens.
Questions & Answers
Hey all I've got a dt40 two stroke 2008 I'm having trouble to get it to run when in the water under load it's hard to start and when it gets started and I go to put it in gear it stalls I've cleaned the carburettor new plugs fuel pump with no luck could it be a timing issue please can someone help cheers
Well-used Dt40 starts first turn of key. Compression 125 & 125. Just had it serviced including looking at Fuel lines & carb cleaned, new fuel pump diaphram
Runs well up to 3500rpm forever, no overheating etc, but as soon as we wind it over 4000rpm in 20 seconds it splutters and stalls. re-prime the bulb and it starts straight away and will run happily - up to 3500rpm . We thought the fuel pump was faulty & so replaced it. Any ideas, please?
Try a new fuel line, I’ve had them deteriorate internally and restrict fuel flow.
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