premix oil and gas question

saber1

Active member
can having too much oil in a premix cause a bogging problem .my kids sled worked fine last year . this year my son did the premix and put too much oil in and it smokes alot more and boggs down so i was wondering if this can cause it.
 

gary_in_neenah

Super Moderator
Staff member
Kind of wondering why you're doing the PreMix, but oh well.

Sounds like it's too rich. Remember the oil in a 2 Stroke is just along for the ride as the gasoline gives it a ride into the engine to lubricate moving parts. You get your power from the gas and air mixture. Too much oil will foul your plugs and cause the bogging. Are the plugs black and gunky with lots of carbon on them? This used to happen a lot before Oil Injection became common.

I'd dump the gas, fill with new along with proper pre-mix and change the plugs. Should be good.
 

saber1

Active member
thanks for the info its an old sled and the oil injection does not work so we have to premix its his first sled next year moving up to a newer sled with oil injection .time to drain the premix and start over
 

thebreeze

Member
It can, but it takes a lot of oil for it to do so. I run my sleds pre-mixed at 32:1, as do many others with good engine response. Some two stroke oils burn better/more complete than others.
 

vipermax10

New member
if it had oil injection you better watch the jetting, oil takes up volume that would normally be gas and leans it out.
 

IceJam

New member
HEY ATLEAST the kid is trying (A++ here for him)and he is not 1 of the millions of lazy spoiled do nothn watchn sponge bob kids in the 11th grade
can having too much oil in a premix cause a bogging problem .my kids sled worked fine last year . this year my son did the premix and put too much oil in and it smokes alot more and boggs down so i was wondering if this can cause it.
 

snohawk

New member
Kind of wondering why you're doing the PreMix, but oh well.

Sounds like it's too rich. Remember the oil in a 2 Stroke is just along for the ride as the gasoline gives it a ride into the engine to lubricate moving parts. You get your power from the gas and air mixture. Too much oil will foul your plugs and cause the bogging. Are the plugs black and gunky with lots of carbon on them? This used to happen a lot before Oil Injection became common.

I'd dump the gas, fill with new along with proper pre-mix and change the plugs. Should be good.

If you put more oil in the mix the jetting will be lean and cause a bog. It takes gas to run and if to take away the gas and add oil which does not burn you will have a leaner gas mix going to the engine
 

anonomoose

New member
Oil goes into "perfect" solution when it is mixed with gasoline. Gasoline mixed with too much oil will smoke more and it will burn cooler which is why it fouls the plugs. But it is NOT a lean burn issue because if it were a lean burn issue, the machine would burn much hotter and that's when you burn a hole in pistons and have a general melt down. 2 Strokes don't like too much heat.

The oil does burn at a steady rate. But the engine has to be running at the right temperature to do it. Too hot...melt down...too cold not enough oil is burned and this isn't quite as bad and a hot condition but it can foul plugs and gunk up the pistons.

While the 2 stroke can run under a very lean condition which modern state of the art machines try to do to keep within emission standards, too lean is bad for them as it always has been. But if you run pre-mix with a GOOD oil that has all the required certifications, you should be able to run at 50:1 under all normal conditions without fouling the plugs or gunking up the pistons and still get all the power the machine is capable of producing.

Just don't run the machine with less than 50:1 or use a poor grade oil.
 
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