MOPED ARMY

I don't know anything about E50 or potential problems with the case matching (is there enough meat?), but if everything is hooked up properly I don't see why it wouldn't work. I wouldn't want my carb down low and unprotected though. Why do this? So you can rout the exhaust a certain way?

hilarious.

on a batavus m48 the carb is located underneath the engine and it still works fine (i mean...its still a batavus), but then again, those are case inducted. soooooo..

wait what the fuck did i just say?

@ Chris The float will still function like normal in the carb, and once the fuel has passed through the venturi, it's a gas anyway, it might as well get sucked up into the engine instead of sucked down.

@ Maitland Since the piston is upside down, the case doesn't know the difference, I don't think I'd have to reverse the crank.There might be a spark problem, but I think the rotation would stay clockwise like a stock E50, but would it cause the engine to run backwards?

you would have to change the timing to make it run backwards. I can push start my Puch backwards, but the engine still kicks forward once it catches.

You would only have to make it run backwards if you mounted the crankcase upside down as well. If you rotate the cylinder, match the ports, and leave the crankcase right side up I'm pretty sure you wouldn't have to time it to run backwards.

I would be more concerned with the heat transfer from the header. If it's going on a Maxi, would you really want that pipe so close to the gas tank? what, if any , metal stress in the frame might occur from heating up like that?

Also, clearance becomes a point of awareness. If I bounce off, like say, a big curb, would I rather risk hitting the header and be able to ride away with a dent in the pipe, or hitting the carb and be stuck on the side of the road with a broken carb?

First off, Why? That i still really don't get. second off, i don't see why it wouldn't work. i guess it depends on where the case's ports match with the cylinder, but if it is completely the same, i don't see why not. engines don't use gravity, they use differences in pressure. That was a lot of Don'ts Haha

First off, Why? That i still really don

hehe . that might be the case, craig. no pun intended lol

I think it should work. You shouldn't have to mess with the timing or porting or any of that, just flip the cylinder and piston. I don't think the engine can tell the difference. You'll probably want to weld up the case transfers and re-grind them otherwise they might be a bit funky. On some older racing bikes they did this. Then the exhaust could run straight out the back with no bend in the header. Of course they had upright cylinders. This is common on racing solex also. They don't have any room behind the engine for a real exhaust so people turn the cylinder around so they can make a header and run it down the front of the engine. As mentioned it isn't exactly idea with a horizontal cylinder because your intake and carb will be exposed to more dirt/water/damage than it would neatly tucked on the top of the engine.

It would work. that dumb engine wouldn't know the difference

Dude, there should be no problem other than the mechanical arrangement difficulties you described. Vespa smallframe scooters' engines are "upside down" . Go for it. Do it. Underseat Exhaust? Hawt!

I think this will work, AND be hilarious. It's a win-win, folks.

I saw an Express engine for sale on Ebay, the picture showed the Jug mounted with the Exhaust on the Upside.

I thought it migth be cool to mount it 90 degrees and have the exhaust exiting the side