RE: Thunder Tiger FS75 problem in Reactor 46
Automotive O-rings are almost invariably neoprene.
This synthetic rubber is resistant to petroleum products and to glow-fuel...
Before the superior flexibility of silicone tubing caught the entire industry, all glow-fuel tubing and seals were neoprene.
Most carburettor O-rings still are...
Bill, Jucava,
Please check where *exactly* your TT engines were manufactured/assembled...
From your multiple problems, I fear it may not be South Korea...