Magnum 70 Four Stroke Black Exhaust Residue
07-25-2004, 05:04 PM
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Magnum 70 Four Stroke Black Exhaust Residue
I'm halfway through the run-in cycle for my Magnum 70, had about 3 tanks of fuel through it. The fuel tube running from the exhaust nipple to the fuel tank is blackish/dark inside - I'm thinking this isn't good, any suggestions/advice? I have followed the manufacturers' run-in instructions.
Cheers
Da Orc
Cheers
Da Orc
07-25-2004, 07:14 PM
#2
RE: Magnum 70 Four Stroke Black Exhaust Residue
First, if you are running it leaned out, you aren't doing it any good. A ringed engine like a 4-stroke needs some rich running to break in. I have one that I ran a half gallon of castor blend with extra castor to bring the oil percentage up to over 20%. Now I have it on a Big Stick 40 for air breaking in. It is running strong, but still needs more time to get it to tune properly. Due to the short, Big Stick gear, I am running a 12-6 3-blade. The plane is nose heavy, but it does have good vertical for 500 feet or so.
When a ringed engine breaks in, it wears the ring to a good, smooth fit to the cylinder sleeve. This needs to be done in a slobbering rich 4-cycle with a high oil fuel with castor in it. Try this for a half gallon and if your engine doesn't run correctly send it back to Global Services.
When a ringed engine breaks in, it wears the ring to a good, smooth fit to the cylinder sleeve. This needs to be done in a slobbering rich 4-cycle with a high oil fuel with castor in it. Try this for a half gallon and if your engine doesn't run correctly send it back to Global Services.
