, do I understand correctly you ran this engine on "fumes"? If so... you are inciting detonation, for sure, with potentially detrimental effects, especially to the piston and rings.
That fumes experiment was what showed me the my buddy was not the expert I thought. He picked up on an idea, but has yet to refine it.. Like so many others.
It ran, bogged down and picked up again. Then, I shut it down and gave up on the idea, entirely.
I suspected that this might cause some damage. If it were a workable solution, engineers would have already figured out how to get the fumes from the tank to the combustion chamber.
Yet the best they can come up with is delivering gasoline to the carburetor, and letting the carburetor do its job.
I just dropped it off at the Honda dealer.
He was very reserved about any warranty work and said that they do not do swap outs, new for broken.
It is likely a head - gasket ? - issue and would take 2 to 4 hours to fix. At $ 89 an hour, that is $ 400 with taxes. New ones are on Sale for $ 1,029, so it is roughly 40% of the cost of new.
iowagold, there is no indication of a problem with the spark plug. The thing starts on first or second pull, even well below 32*.
RedOctobyr, the magnetic dip stick is not a cause of the increase in oil consumption.
If anything, it would help retard oil consumption by helping to keep debris from running through the combustion process.