Guys,
I have an ABC Fox 35, the p/c was from GMA. The engine as only a few runs, was very tight when I last I tried it and was difficult to needle. I pulled the P/C and did some light lapping which loosened it a bit but it still has a good pinch. Question is how much break-in is needed for this set-up? I'm assuming that 10%N, 25% (50/50) oil will work. Anyone running one of these?

Best,    DennisT

I am breaking in one as well, using all castor.  Is that a good idea, or should I switch to a 50/50 blend?  So far, I have run it for four times, two minutes each time with a long cool down between runs.

Regards,

Brew

Brett -

     The ABC piston/liner that I am using is the one that was sold for some time by Fox Mfg.  I am going to switch over to the 50/50 castor & syn fuel and complete the breakin.

Regards,

Brew
     

Hi Harold
The  FOX ABC sets  that  they ( i actually heard K&B made them)  made are not fitted  as tight as  the aftermarket  early ones that George had, use a minimum of  50% synth fuel  with  at least 25% total oil. run it 2 to 3 minutes at a time  with cool down in between, Set the needle so it runs the cackle between a 4/2, NOT richer, then you can pinch the tube for a second to let it burst into a 2 cycle, after a couple runs, you can turn the needle  IN  to where the  fOX will run in a  2 stroke  , do this  for  10 seconds the  back  to just  between  4/2  stroke
8 to 10 runs  should get it in shape  to start  flying.  as  stated  do not  run it very rich,  nor  very lean you want to bring it all up to temperature for breakin. I would  highly recommend  wood  props  to fly, and  I would  use a  10x4 wood  for  break-in

Randy