There's no big deal on the WA197, the original application got shut down so Walbro no longer makes it., same as the WTA6 that was standard on the G38 for about 20 years..Zenoah uses a WT338 now, so there are no more WTA6s...All the internal parts are the same as any other WT carb..When you buy a carb kit it comes with pieces for ALL WA and WT carbs, the only exception being the WTA6, which takes its own kit....There are some different throttle plates because of the venturi size, and different ends on the throttle shaft to fit different applications...Some have chokes, some don't....One of the best WT carbs is the WT76A, used on almost all the 50cc and under engines sold..Same bolt pattern as all the other WA and WT carbs..It is one of the few with a choke plate.....
Difference in the carbs are in the sizes of the 2 or 3 holes in the venturi to regulate fuel mixture from idle to about 1/3 open....
The Williams airport got completely rebuilt last year, new admin building, completely fenced, with a new operator that lives on the property...Spent about $2,000,000 on the job, all brand new runway..Great place to fly, as there's not too much activity yet, but the new operator is working on getting more users..
I'm trying to get some time to put my G26 on a Phaeton 90 bipe that;s been hanging up for about 3 years, all ready for an engine...the last engine in it was an Enya 240 V twin..It was OK but too heavy..The G26 is lighter and should work better, should come out about 13 lbs...