The original plastic carb has small reeds inside it for the pump and inlet areas.. They are actually the exact same thing as on a Cox .o49 reed valve intake system. Kind of star shaped brass. If yours are corroded as many of them were, there ya go..replacements are available from hobby shops. Make your own gaskets.. Orignally mine had the plastic carb with aircleaner, but it was cracked and not serviceable, so I used a Walbro on it.

The engines rattle alot, due to the extra crank extention they have..lots of end play..didn't hurt a thing however since it runs fine for me. I did use Yamabond to secure the rear seal though since must have shrank due to heat and age..hasn't leaked yet. Make sure the 6 bolts for the cylinder head are kept tight or the gasket will blow.

John