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TOPIC: Premix question

Premix question 03 Jun 2019 17:56 #1

  • Jagarrett369
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I have a 1974 Yamaha Dt250. The oil pump is disabled and only use premix. The bike is new to me but here goes. I mixed 32:1 and it smokes like a meteor going down the road. What is a safe but non fouling mixture?
My first post here so help me out guys!

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Premix question 03 Jun 2019 21:20 #2

  • Mothersbaugh
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32:1 is excellent. Two other things could be causing the smoke. 1) you have a right side crank seal leaking transmission oil into the combustion chamber. Or 2) it sat for a long time and you have an accumulation of oil in the pipe that needs to be burned out over a long ride session.
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Premix question 03 Jun 2019 21:26 #3

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Jagarrett369 wrote: I have a 1974 Yamaha Dt250. The oil pump is disabled and only use premix. The bike is new to me but here goes. I mixed 32:1 and it smokes like a meteor going down the road. What is a safe but non fouling mixture?
My first post here so help me out guys![/quote

I use 32:1 on my premix on my 2 strokes don't have autolube. it is the best compromise between good engine life and performance. your pipe may be clogged up with two stroke goo. in That case I burn out my pipes with a torch. the bike may had been babied too much and this causes the plugged pipe problem. none of my bikes smoke that much running with the 32:1 oil gas ratio.

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2 1968 DT1s,1970 RT1M,1970 DT1C,1971 RT1B,1971 Honda Z50K2,1974 DT100A,1974 Honda MT250,2 1975 DT400Bs,1975 Honda CR250M1,1978 DT175E,1979 Honda CR250R.
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Premix question 03 Jun 2019 21:34 #4

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Welcome!

Your question is basically opening the proverbial "can of worms" regarding oils and oil mixtures.

Are you sure you mixed the oil and gas correctly? 32:1 is not an excessive amount of oil and I wouldn't go any leaner myself. How many ounces of oil did you add per gallon of gas? (or whatever units of measure you used).

(adding 32 ounces of oil to one gallon of gas is something I've seen before)

Oil type can make a difference... most modern two stroke oils are relatively "smokeless" but you didn't say what you're using.

Running (fuel mixture) rich on premix due to a clogged air filter or something on premix will cause excessive smoke... even the "smokeless" oils tend to smoke a little on a cold engine...

If a bike has been sitting for a long while or just has a lot of old oil deposits it can take a good hard run to clean it out... Not unheard of to have someone jump on a bike that hasn't been ridden in a long time... maybe had extra oil added in storage... ride it 100 feet and proclaim "excessive smoke"... and start making all kinds of changes when the cure might be just riding it good and hard a while. Not enough information given to know.

One important thing is if the clutch side crank seal has gone bad the engine could be drawing in and burning trans oil. Keep an eye on the trans oil level... if you know what the two stroke oil you've chosen for premix smells like when it burns you can often tell a trans leak because most oils used for the trans smell a lot different if burned... usually terrible in comparison. Hard to tell by smell if you don't have experience though.

P.S. It's often when the smoke stops that you have to worry.
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1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

Premix question 03 Jun 2019 21:36 #5

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P.P.S. I type too slow. :haha
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1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

Premix question 03 Jun 2019 22:55 #6

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32-1 is good. Bet money [not much lol] that its just a soak exhaust & needs a burn out or it'll just keep smoking unless you go for a 100mile ride at highway speed. If it was the right side seal you'd be loosing oil into the motor & getting burnt. I guess it smokes that much but still don't think seal because you'd be complaining how bad its running as to be 'that' bad it'd be sucking air plus oil.
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Premix question 04 Jun 2019 03:14 #7

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If the Primary side (Clutch side) seal is leaking, the trans oil will be consumed and because of this the smoke itself will hot have the normal two stroke smell, it will instead have a very stinky acrid smell to it.
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2 1968 DT1s,1970 RT1M,1970 DT1C,1971 RT1B,1971 Honda Z50K2,1974 DT100A,1974 Honda MT250,2 1975 DT400Bs,1975 Honda CR250M1,1978 DT175E,1979 Honda CR250R.
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Premix question 04 Jun 2019 07:13 #8

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MarkT wrote: P.P.S. I type too slow. :haha


You type just fine. I just worked the button like the latest Jeopardy champion, who now, I see, has met his match and lost.
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Premix question 04 Jun 2019 11:40 #9

  • Jagarrett369
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Alright, first of all thanks to everyone for the quick responses. I guess I should have been more detailed. I mixed 4 ozs of Casterol 2 stroke oil to one gallon on 87 octane. It started smoking like this after sitting for a couple of hours after a 10 mile ride at 40 mph. Bike is running strong with no miss or loss in power.

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Premix question 04 Jun 2019 17:21 #10

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That’s 4 ounces of 2 stroke oil mixed into one gallon of 100% gasoline. 32:1 mix ratio.

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