mix ratio for a 78 ET 250

sandmanmike1

sandmanmike1

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Nov 11, 2004
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What is the mix ratio for a 78 yamaha et 250. The tank has a messed up cap so I am eliminating the primer switch on the dash and oil tank and doing pre-mix with a gas tank from a yamaha blaster. Should fit nicely under the hood.
 

Thanks for the info. My son was pretty excited to here her run. I bought it off a co-worker for $150 who said it just stopped one day. Put a 17 dollar coil on it, pulled it 7 times and it fired up. Needs work but with the help of TY It will be good too go.
 
we have a had a 78 ET 250 since 84. i run Av gas 20-1.. only reason i use AV gas is it doesnt get used every yr and AV gas lasts waaaay longer than the chit ethenol gas we have now. it wasnt used 4 yrs and new yrs eve it started in 3 pulls.my son repainted it 4 yrs ago.and i redecaled it..a friend that has 4 of em rebuilt the seat and i just got a new windshield for it..also put ski skins and ice scratchers on today with the no snow we have,, going to Edsons Antique ride in 2 weeks,and our poker ralley if its not cancelled like the last 3 yrs.
 

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Oleyamirider said:
we have a had a 78 ET 250 since 84. i run Av gas 20-1.. only reason i use AV gas is it doesnt get used every yr and AV gas lasts waaaay longer than the chit ethenol gas we have now. it wasnt used 4 yrs and new yrs eve it started in 3 pulls.my son repainted it 4 yrs ago.and i redecaled it..a friend that has 4 of em rebuilt the seat and i just got a new windshield for it..also put ski skins and ice scratchers on today with the no snow we have,, going to Edsons Antique ride in 2 weeks,and our poker ralley if its not cancelled like the last 3 yrs.
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Nice!!
 
To anyone, Do not, I repeat, Do not use yamalube R for snowmobile premix if you are out riding and need to do the old gas station fill it up, put the gas in then shake the sled to mix it. I did this one time when it was about 15*F. All the oil went to bottom of the tank in a big thick glob then got sucked into the carb with nearly no gas in the mix. It went about a 1/4 mile out on to the lake then stalled with the all oil mix. Had to be towed back. The yamalube R is just too thick. Not sure about regular yamalube. Never tried it. If the non-synthetic even still exists. I have beed using Polaris pre-mix oil made specificly for old sleds at 32 to 1. Been working great.
 
BornYamaha said:
To anyone, Do not, I repeat, Do not use yamalube R for snowmobile premix if you are out riding and need to do the old gas station fill it up, put the gas in then shake the sled to mix it. I did this one time when it was about 15*F. All the oil went to bottom of the tank in a big thick glob then got sucked into the carb with nearly no gas in the mix. It went about a 1/4 mile out on to the lake then stalled with the all oil mix. Had to be towed back. The yamalube R is just too thick. Not sure about regular yamalube. Never tried it. If the non-synthetic even still exists. I have beed using Polaris pre-mix oil made specificly for old sleds at 32 to 1. Been working great.
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Have always used 2R for the dirt bike and 2S for the sleds. 2S hasn't had any issues in the 340 Enticer with the injection removed.
 
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