I have this little clinton model 501-1 and it runs like a champ, but what type of air cleaner am I missing on this. I haven't found any pics online that show me this model with this carb setup to know what to look for. Also, I know Clinton hasn't made engines for a long time, but what is parts availability like? Does anyone make gaskets, oil seals, etc? I haven't found a manual specifically for this engine either. Any thoughts or comments will help!