Hi there,

Having a few problems with an old aircraft. Hasn't been used for about 10 years. Took a little while to fire up the engine for the first time again, and since then the aircraft has done two 10 minute flights.

Problem now is that the engine is not throttling up properly. It seems to work fine from 0-50% and anything above that it splutters and cuts out. I've played around with the high end mixture to both lean and rich sides and when it eventually does get a higher RPM, it works until i lift the nose into the air.

When the nose is lifted up, the engine RPM gets lower and lower then cuts out. If i hold the nose down the engine initially increases in RPM and then cuts out. The tubing in the tank (without opening) appears to be intact and the clunk is still attached to the tubing. The engine is an Irvine 25.

I've tried messing with both the low end and the high end needle to no avail. It's probably reached the stage, where all the settings are way out.

Any hints, tips, name calling, or pointing out of 'obvious' mistakes are welcome...........

Cheers.

Gareth.