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No that's not how it works.
The fuel/air is drawn in through the throttle slide.
So has you increase the throttle, you increase the fuel/air. If you mix the oil in then altering the throttle alters the fuel/air/oil. Therefore it works just like the oil pump on idle.
Again, please open these up in the correct section.
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@Calum what I'm asking is what amount would you reccomend I put in to richen the oil mix in conjunction with the oil pump currently I'm running 150ml to 5l with the oil pump and it seems like 50ml with the oil pump would be decent I know it's not a very straight forward question but I'm just gauging your opinion and input as all of this is a learning experience for me thank you.
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Running that much oil with the pump as well is seriously pointless. If the pump is working correctly there is no need to be putting more oil into the fuel. I put double my usual amount of oil into my KTM 250 EXC a couple years back and I'm pretty sure it was the cause of the piston seizing, about 15 minutes into riding.
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@declan Please follow the Manufacturer recommendations first before asking any of us.
It's best to 'guestimate' a healthy oil supply from that. But, from experience, as less oil you can work with the better!
I run my DT on a 42:1 mixture still. These road going 2strokes just don't require heavy lubrication.
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@Darty true! And tbh even today's Mx bikes don't need a ridiculous amount of oil. KTM recommends 50:1 with most of their line up.
I think the freeride series are even less like 80:1???
Just read their newer bikes are on 80:1 with some people even going as low as 100:1 ! -
@Mightyman I was reading in Motocross Action Magazine that Husqvarna were recommending going from 40:1 to 60:1 to fix the jetting issues the MXA test team were having when running the 2017' TC250.
And it it worked! Incredible for a complete MX race engine.
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@declan Not quite,
A leaner burn can still give the right operating temperature as the fuel is taking slightly more heat away from the cylinder walls.
But yes, as more friction occurs, more heat is generated and thermal expansion will eat into your cylinder tolerances quicker than a richer mixture.
It's hard to say, cylinder fill being very efficient nowadays!
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I've seen people run 2% premix together with the oilpump for breaking in a piston.
People did that back in our moped days aswell.
But for everyday use, no point. If you dont trust your oilpump, take it off.....Youre adding oil anyway, so why dont you?People seem so over-cautios about too much oil, i think theres a lot of information, floating around from back in the days with gummy been oil, that broke down and seperated from the gas if it was let to sit for a long period. This isn't racebikes, its everyday-bikes, they will run on a 5% premix, with a quarter of the gas beeing diesel. Tough reliable bikes.
Anyways, my guess is, at idle, the pump is flowing 1% or less.
