The problem I am experiencing is this, I have about six flights that I have put on the engine (3W150 old style, previous owner had a lot more on it) with brand new 3W ignition. I have had two dead sticks out of the six flights the other day. It seems that I can fly right up to around nine minute flights without any problem what so ever but as soon as I hit nine minutes the engine just dies. There is plenty of fuel, I am thinking it is a heat issue. The engine is mounted in a 40% Carden Cap 232 with a 32X10 Bolly Carbon prop. The cylinder head temp was 268* with no baffling immediately after shut off on my last flight which was not a dead stick. I plan to install some baffles on the cowl intakes and see if it helps before any further flights.

UPDATE

I installed baffles in the cowl per the Cactus Avation website. The temp went from 268* to between 185* and 200* but I am still having a deadstick problem. Two out of four flights today were deadstick. I no longer think the problem is heat related and today it actually happened about five minutes into the flight instead of nine minutes. I am thinking it might be a fuel delivery problem of some kind. The engine drops down to an idle and sputters before it finally dies. I pulled the tank and the lines and tank look clean. I am wondering if it might be a problem in the carb? Any thoughts anyone might have or advice you could give would be greatly appreciated.

I replaced all the fuel lines tonight. I noticed after the last dead stick that there was an air bubble in the line where the t-fitting for the refuel line connects. I got rid of the t-fitting and ran three separate lines.

I pulled the top half of the cowl off and looked at the plugs. The metal ring part of the plug is a dark grey or black and the electrode was a white color so I will also try richening the screws a little.