I have a question, as well as a potential additional test you could perform.



Question: Are you using a premix on this motor? If so, what oil and to what ratio; and if not, why not?



Test: Does premixing your fuel affect horsepower/output. Its generally accepted that premixing has an affect on octane amongst other fuel characteristics, however the benefits of premixing are also well known and generally accepted as a beneficial habit. It would be interesting to have a comparison using healthy motor where any differences may have a more noticable difference (as a percentage decrease, or possibly percentage increase, who knows)



Good luck,

Ricky