Re: QD-10 that runs horrible. Expert advice needed.

[fisherman6]

Bob, Thank you for posting that. I had never seen that in the operating manual. It is printed on the front of the cowl of my 1954 QD-15 though. I did read that somewhere. There may have been a service bulletin, but I certainly do not know that for certain. Other than the wider bearing on small end of the rod and then needle bearings on the wristpins, there is very little difference internally in the QD line. These early ones came with a 6 gallon suitcase tank and those did not (or at least I have never seen an original that did) have mixing instructions on the tank. The QD-16 came with the more common 6 gallon tank which displayed mixing instructions as 1 quart of oil to 6 gallons of gasoline (24:1). It also says for mixing smaller quantities to mix at 1/2 pint of oil per gallon of gasoline (16:1).
I do stand corrected, however, about the factory recommendation for mix ratio for the early QDs. Being that there is essentially no difference in internal construction I do not believe there is any problem with running any of them on 24:1 using TCW3 oil. That apparently is not the original factory recommendation though. My error. 😳
-Ben

OldJohnnyRude on YouTube