Oh now comes more info . You did not say anything about this about pluging it in . It's a Flippen Detroit IF and again i said IF it is in good condition and has NEVER had either fed to it and it under fifty degrees they will need a little cranking to get them to light . In the days of Detroits you had to learn each engines quarks . 1970 R 700 Mack with a 318 that had everything done to it to get a couple more pony's out of it to get it to start in the mornings on a cold day you had to pull the fuel stop and start cranking and crank her for fifteen twenty seconds the shove the stop in and keep on cranking and after twenty five to thirty seconds she would start to lite and you held the button down till ya had atleast three of the eight firing . A 4-71 in the old Lima 44 Crane would NOT start unless it was above sixty degrees with out either or a rag soaked in gas wrapped around the air cleaner . A 6-71 in a Modle C Le Tourneau Stared just fine down to 32 and it did not get run much maybe one a year for a couple weeks then it would set . Condition or the engine valve adjustment settings on the injectors and the condition of injectors mean a lot on how well they start You are working with and OLD engine not one of the newer engines of today and plus the fact that this is a two cycle verses a four cycle . The vary best cold start engines were the D 361 when they came out in 1963 as i have seen them start with out being pluged in or use of any either well down below 0 . My 1977 I H 4370 Eagle with a 350 small cam Cummins was one of the last to have a DE COMPRESSION release , and when it got down below 10 degrees you were tugging on the big TEE handle with one hand and pushing the starter with the other and you would crank it for a good thirty seconds before you let go on the decompression and hopped that she would light . even with four group 31 batterys you got two and maybe three trys before it was time for a recharge and jumper cables . So really i do not think that you are having a drain back problem as much as a LOW COMPRESSION problem or maybe a slow cranking speed problem due to a weak starter or to low of cranking amp batterys .
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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