Lon.   you are welcome to give me a call ,, 314 609 6568,,,   engine might be sucking air from somewhere , but for the life of me I cant think of anything,,   I remember the odd carburetor, but it worked pretty well a few years ago ,   I remember the rotary valve was the last one wayne had and it fit very well ,  maybe try to see if there any loose screws on the round crankcase cover  or maybe the cylinder bolts could use tightening ,    worse case , send  the engine to me and Ill fix it no charge m,   I have a " mule bike " I can test run it in to make shure it's ok,    sorry you're having trouble ,  mat even have something to do with the throttle control .      all the best ,  Larry.

Thanks for replies ,     1 inch electrical conduit makes a perfect exhaust pipe size ,,,   I think i'll extend my exit pipe also ,  good idea ,,,   thank you for the dementia      P.S   I'm doing this on company time,  just  'cause  I'm like that

Good to hear form you Lon,     I'm just now getting back on my feet ,,,,    Give me a ring anytime,   314 609 6568,    all the best ,    Larry.

  some tanks have two fill caps ??   some tanks on right ( where I think it should be )   any clue why my tank has a fill cap only on Left ?? ( later , unthreaded fill neck)   thanks to all   

I agree ,,  alloy jug with zinc base   1950 ish    earlier was cast iron jug and later had alloy base with zinc rotary valve ( that was good for splitting across the keyway )    good project !! thanks for posting it !

That was a real treat ,  Rick ,    thank you for posting all the photos !

 Just reviewed photos and the outboard flywheel tapered hub too big for trial fit ,    ,,, can't imagine how hub can be " off"     ,,,, can't be too hard to reproduce ,,  maybe it just needs the mating surfaces cleaned up better before brazing back together ?         Food for thought ,     We'll all sleep on it     Larry.