I have a wren supersport that I have in a plane with a jetpipe. The engine is full autostart and it is starting the prolem I have is as follows:

1. Turbine spins up and gas valve opens. The gas only ignites when the spinning has almost stopped or on the second spin.

2. This results in a fuz full of gas and when it pops I have a gas flame in the fuz which burns before the turbine spins up and gets going

3. Once it spins up again all is well and she runs fine.

4. I will replace the glow plug and try controlling the gas by hand as a first try.

Anyone have any ideas

Thanks

Bert