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Hi Guys, Thanks for the replies. I'll try to get some pics posted as the engine is still in bits for the second time. A bit of background here - I am in the process of maybe buying the motor off a friend - he bought it in July 09 and never flew it because of inexperience. He asked me to test fly it for him, which I did until it overheated. He got despondent with it and asked me if I wanted to buy it. I said I would after i had found the problem and had a good few flights on it. After stripping the engine I found that the piston and cylinder were marked (they will polish out tho) and the piston rings had failed. I emailed Patricie and ordered a new piston, cylinder and complete gasket set. The engine was rebuilt and ground tests went fine. The second flight went pretty much like the first and the engine died after 15 minutes or so. I am very tempted to fit a different engine as I don't need half of what the f200 can provide ( I had a RAD MXL a few years ago and had many good flights on it albeit it was a pain to get off the ground and the climb out was slow) - Flat Top Dave I think you mis - read that part!! What other engines will fit that frame? - I have good engineering contacts for any mods that might be needed. @ Paul - I don't know enough about the history of the engine to know what ignition system it has. All I know is the frame is in perfect condition and the engine looks like it hasn't done many hours - maybe the previous owner saw these problems coming. Cheers Alex

Help needed with Walkerjet F200 please. Ok here's my problem - I have a walkerjet with a fly engines f200. It has burnt out 2 sets of piston rings in as many flights. I replaced the original cylinder and piston with new ones obtained direct from fly engines, these now look unserviceable. ( however I still have the old ones which look salvageable with a bit of polishing) After some research I have found that the engine has the old cylinder head on it - the one which was causing overheating problems with so many F200's The carb is the walbro 37c and the needles were set at 1 turn on the Lo and 1.5 turns on the Hi. The mix was a 33/1 on Castrol semi synth motorbike oil. Due to my size I had no need the cane the throttle to acheive a comfortable climb out. The engine ran fine on the ground, it had 1-2 hours worth of gentle running in and was warmed up well before flying. So here's my questions: Is it worth buying the new oversize cylinder head? Will this more than likely sort the problem? Would it be better to source a different engine? If so where from? Has anyone got any other ideas as to why it is overheating? Cheers Alex