RE: help !! my RCV 90SP without power!!
Hello Werner,
Per Michael's advice I switched to CoolPower 10%. I believe Michael is running the same. It has 18% oil content. I love the stuff and my 120SP loves it as well. If you can get it, it's worth a try. It definitely runs cooler than the caster blend I was using. Also, per Keith Lawes, (inventor of the engine), you probably haven't damaged your engine. These engines are pretty rugged and if you can still turn it over and it has compression, you should be fine.
Good luck,
Joe