The idle wasn't as fast as a wide open throttle, just enough so that the trans
would try to engage, and then let go. I hadn't thought that just more air would
make it rev faster, I thought it would take equal increases of air and fuel.
I didn't say it was like wide open throttle... just an air leak... like as if you were opening the throttle... a little bit.
Do I have this right ..... ?
The piston is creating the vacum that is sucking in the air/fuel mix and creating
negative pressure in the intake in the process. By there being an air leak, the
piston moves faster because it doesn't have negative pressure to overcome, thus
I would say what you said sounds right... but I try not to overthink things.
I look at your situation like this.>
The throttle controls the RPM... by having an air leak... you have another "throttle"...one with a mind of its own.
If it continued like that, then I should be able to go like a bat out of hell on nothing
but air :-) But seriously, I think I understand, and see why it would seize
(less gas = less oil + faster rpm = seizure)
I would say it is not really the less oil (though that plays a part).
It is the leaner fuel to air ratio.
Two strokes are funny devices... they are happy to run at F/A mixtures that are too lean for their own good... (they won't make the best HP at "way too lean" ratios... but they will run... till they seize).
And as Ron stated here before... they run best right before they seize.
That leads me to another question. If you think of my bike driving forward facing
12:00 then my carb's air intake is at 4:00. Would putting a scoop to force the
air into the carb be a good thing or a bad thing, and what else would I have to
That fits under the category of "wacky" for me.
I know this... that modern full size sportbike (Ninja? type) motorcycles mostly use "ram air" ducts and airboxes now... but it has been shown that they only START to pay off at speeds over 100mph.
So I doubt that what you have in mind would be worth it.
And I imagine you would have to put bigger jets in.
I think turbocharging, nitrous, ram air, and all that stuff is not appropriate (I'm being nice) for a moped.
Alcohol will almost undoubtably be used in all engines eventually... all that has to happen for that is for the price of gas to rise above well above the cost of alcohol (and for politicians to not protect the gasoline industry).