I own a 1980 AMF Flt. I battle to understand why the front cylinder runs warmer than the rear cylinder. I have checked the ignition and valve timming and everything else i can think of. To me it feels like the rear cylinder is just along for the ride. If i feed it it must work. On my microlight we run EGT gauges and the temp dif between cylinder can not be more than 20 deg C but then we have dual carbs. I understand turbines but pistons idont understand fully. Help please

 

almost sounds like the rear cyl. is misfiring. check for spark and do a compression test, then get back to us with the results. also, how much cooler are you talking?

 

The forward cylinder measured on the outside at the exhaust stud is 312 deg c and the rear cylinder is 220 deg at 1200 rpm after a couple of minutes running. I have dual spark plugs. Checked again last night and all four is firing. Sorry for the delay but there is 8 hour time difference. Will check compresion as soon as i can. Thanks

 

Did the compression test. Front 120 psi cold and 123 hot. Rear 105 cold and 110 hot. Changed spark plugs and leads. at idle the rear sounds like it has a mis fire and rear sounds smooth and warmer. I have an power arc 2 electonic ingnition unit

 

Check and double check your timing. It doesn't take much to produce a situation like you mention. Also check your intake seals for leaks...