Marvel Mystery Oil or Two Stroke Oil for lean cylinder?

Which would you recommend and why? I mixed in some two cycle oil this morning (about a shot glass full to a full tank) and the bike seems to be running smoother and the lean plug has moved from a white to light tan color. I have an inline fuel filter. Would the filter be at risk for clogging from oil with the gas? I plan to sort the lean condition for good in a few weeks, but the two stroke oil seems to be at a least a temporary fix. What are your thoughts XJ experts?

 

Either; or.

The Oil reduces the Explosiveness of the Burn.
A Slower Burn means a Cooler temperature.
Safer for the Aluminum Piston Crowns.
The Marvel will be less likely to cause Fouling a Plug.

 

The two stroke oil will be better because it's formulated to withstand the compression/heat and still provide the safety layer.....lubrication. It isn't that important though since your engine is lubricated by another source. The two stroke oils today, unless you are buying NOS or pure junk from china, are all so much better then they were even just 10 years ago. As proof, you can go to the two stroke forums and you'll hardly EVER find a fouled plug issue anymore....just a thing of the past nowadays.

The filter won't be affected by the mix....we do it all the time with our triples that have blanked-off oil pumps.

jeff

 

the plug turned tan colored because you are burning that oil you put in the gas. i would think that the only side effect would be eventually plugs might foul out. it would probably take a long time though.

i run a little splash of marvel mystery oil in every tank to try to compensate for the ethanol in this junk they call gasoline...

 

Something any two stroke guy would know

 

I don't follow this logic. Sure there is less gasoline to burn, but there is the addition of oil, which also burns, but now the octane is lower, which means it doesn't burn as hot, which means it should compensate for a lean mixture. Bearing in mind, the amount of oil/gas ratio is pretty smaill, so I'm not sure it would have that much effect.

 

they are talking about air:fuel mixture not airil mixture... oil doesnt lower octane.

 

Theoretically, if you include 'something' into the gas that is being burnt, then the octane rating for the injected gas has to be lowered, which would lower the 'oooomph' on the downstroke, which would lower the burning temp, which the op was looking to do, in order to temporarily fix his lean condition. Oil in the gas would also 'theoretically' slow down the combustion, which would also lower the temperature of the burn, which would also lower the burning temp -

 

Oh my this is getting deep. To be sure the oil would slow the burn and lubricate the upper cylinder as well as increase the heat dissipation of the valves, how much is a complicated question to answer-and carbonization is another question here.

Higher octane does NOT indicate a hotter burn, or more 'ooomph'. Higher octane refers to the rate of burn, higher octane burns slower and therefore more uniformly. The concept of higher octane leading to more power or 'ooomph' comes from the fact that higher compression motors require this type of fuel. It's the higher compression that gives you that extra HP or torque, and higher compression dictates that the fuel must burn slower and more uniformly or it will pre-ignite under the increased pressure also called detonation.

So contrary to popular belief lower octane fuel burns quicker and hotter than higher.

 

I stand corrected on the octane question and should have known better. Higher octane solves the problem of 'ping' - which of course is pre ignition, due to the gas lighting off prematurily. But to get back to the OP's question, yes, oil will slow the burn on the bad cylinder, but it will also have the same effect on the good ones. But if it's just for a short time until he can fix the engine properly - I'd say go for it.