The 310 is probably the better choice, less effort to start. The 310 in a 706 has different compression than a 686 which we had. I bought a 706 with the 282 in it and ended up with a major overhaual shortly after getting it. We had trouble getting 72 hp out of it on the dyno a week or two after the overhaul. Ran really well but smoked terribly when getting near the 72 mark. The 686 if you didn't work it hard enough would ooze black from unburn't fuel on the muffler. It would pull the 4-16 easier at the same fuel as the 706. We had the 686 resleeved so it would start easier to the 706 sleeve/ piston assemblies.My former neighbor still uses his 706 with a 310 for chores alot yet even today. I don't think you would go wrong with either but the 310 is a little better from my experience. Hope this helps.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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