[E4ODnut]

A few years ago I bought a high mileage Sprint 1 L 3 cyl. It ran well and had good compression, no smoke, great fuel economy. It didn't take long for me to realize that it was burning about 1 L of oil every 400 KM, but yet no smoke. I was surprised. I tried every snake oil trick in the book to cure the problem. No joy. After about a year of this it started to lose power so something had to be done. I posted my problem to the specific forum and one of the Gurus responded with the opinion that because it was a high mileage city driven car with questionable maintenance it was very possible that the oil control rings were gummed up. After time the increasing oil consumption would have elevated combustion temperatures enough to damage the exhaust valves (hence the loss in power). "New exhaust valves and a set of rings is the only cure" he stated.

He was dead right.

I did an in frame. Cylinder bores measured to factory spec, as did the crank journals. Rings and valves only. 50,000 KM later, about 7000 km before necessary to add oil, but I don't, I just change it.

I realize that it's not a Honda, but I suspect that this is what you may have to do.