Originally Posted by 2door
Oh boy. The piston sellers are going to love these ideas. It reminds me a posts I've read where the guy cranks down on his fuel petcock and tells how great his engine runs. They're usually the ones you see posting back asking why their engines have lost power they once had. Lean 'em out guys. They'll scream! (for a little while)
No offence, Shan. I know you'd know how to control it so as not to cause damage. Actually the idea isn't new. Aircraft with recip engines and carburetors have had external mixture controls for decades.
No offense taken at all Tom, I expected some remarks toward my last post, and I am by no means encouraging anyone to give this a try unless they can afford a new engine or they know what they are doing.
Tillotson carbs on some of the racing go karts that run the GX200 Honda engines and there clones have remote adjusters so that the driver can richen or lean the mix while they're racing, so yeah the idea is nothing new but like you said for the novice that doesn't understand what is going on, a fairly quick melt down of the engine could and will be likely.
My idea initially when I had considered rigging one of mine up with this set up was that I would use a small intake tube like a small fuel line that is used on chiansaws and weed wackers, jet my carb to run correctly with the valve completely open with as much air being pulled through it as possible and then having the option to richen the mix just below the point of 4 stroking when I'm making long runs at close to wide open throttle so I would be getting as rich of a fuel/oil mix into the engine as possible just outside of power loss from 4 stroking.
My thinking has been that this would allow maximum lubrication and cooling in those higher RPM's for the long runs I make when I ride into town.
I figured I'd have to experiment a little with finding the right ID tubing to use so that I would not have to have to large of a main jet in the carb to make it work with the small valve in the open position.
Just a thought and if the Lord's willing and the creek don't rise, maybe at some point I'll get the time to tinker with this idea and see what I can get done with it and if it could be used as I'm thinking it might be.