ORIGINAL: jack1933
ORIGINAL: RTK
tkg,on some carbs all you need is to hog out the needle area (no welch plug), direct feed from under the diaphragm to needle and very large orifice to the venturi.
Jack,I agree the wb-25 is a poor choice for the 100cc class engine. I bet if you bought enough carbs from Walbro they would taylor one to your specific engine, or you could just pay to have them do that.
The wb-25 is , in my opinion, too large for a 100cc engine, and if one would give Walbro an order for 10,000 carbs, they would indeed calibrate a carb for you. this market is too small compared to the industrial market, all we are is just a little pain in the arse to them, Have been in touch with walbro and Homelite engineers in the past, 30 years ago, and learned a lot about this subject. All I can relate to anyone is, IF YOU CANNOT RICHEN THE MIXTURE AT WOT THEN THE WRONG CARB IS ON YOUR ENGINE. This is not my opinion, engineers opinions.
A dirty inlet screen will do the same thing