RE: wren supersport
I hear what you guys are saying (although Ron seems to have changed his views somewhat !) but I still feel that the best people to solve the problem are Wren and I'm very surprised to hear that they have not, to date, fixed it. because they have such an excellent reputation for customer service.
I absolutey believe that any engine which is not consistently operating normally is not fit for flight and 'flamers' can cause internal damage which could lead to premature and possibly catastrophic failure of the engine itself as well as damage to the tailpipe which could also lead to premature failure with consequent fire.
Perhaps, too, it could have beeen said at the beginning of the thread that it had been back to Wren 3 times. A response here from Wren could well have followed and the problem fixed, they are probably more intersted that anyone in solving the mystery !
If after 3 returns to Wren and the problem STILL persists you should not be paying again !
Regards, David