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TOPIC: 1978 dt250 carb tuning

1978 dt250 carb tuning 10 Oct 2018 19:07 #1

  • kakon864
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Been trying to get my bike tuned and was just wondering if this sounds right (I haven't heard many 2 stoke bikes).

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1978 dt250 carb tuning 10 Oct 2018 22:00 #2

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Idle dont sound out of line , but its isnt known if its warmed up and cleaned out at this point , How does it perform under load.?

Rich

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racerclam

1978 dt250 carb tuning 10 Oct 2018 23:20 #3

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It performs well under load, I was mainly concerned with this whirling noise(kinda hard to hear) and the popping noises (which I'm pretty sure is normal for a two-stroke bike, as I said I've never really heard one). Also all of the sudden the engine keeps revving into the redline all of the sudden while idling and I have to kill it.

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1978 dt250 carb tuning 11 Oct 2018 06:00 #4

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There are many great mechanical gurus on this site and I am certainly not one of them BUT..... The reving sounds like a crank seal leaking. I know this from direct experience. When they do that they allow air into the crank case creating a lean condition which revs the motor. The parts are cheap and it’s a good afternoon’s work to replace both but not un-doable for a beginner.
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"Creativity without control is merely chaos"
1977 DT250
2008 Kawasaki KLR650
2018 WR250R
Hammond Organ
Fender Bass

1978 dt250 carb tuning 11 Oct 2018 08:43 #5

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Its either starving for fuel or has an air leak. Is the tank clean and is the petcock been cleaned out and flowing freely. I just did a 400 of the same year and the base gasket at the front under the pipe exit was leaking and causing overrev. These bikes run pretty smoothly when you get everything right
Doug
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1978 dt250 carb tuning 11 Oct 2018 08:56 #6

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I cleaned the tank prior to starting the first time and fuel flows good. I think i'm gonna buy a full gasket/seal kit. It comes with the base gasket, so mine as well replace it if i have it. Also gonna replace the crank seals, since it's cheap.

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