ZDZ 90 RV-J Crankcase Failure
09-13-2019, 03:24 AM
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ZDZ 90 RV-J Crankcase Failure
I have had two ZDZ 90 RV-J's destroy themselves. Both had less than a dozen flights on them and both blew up exactly the same way. Both had the bolts which hold the rotating valve on the back cover of the case break off. I got two new crankcases. How do I prevent this from happening again?
09-13-2019, 04:11 AM
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I don't know if the broken rotating valve bolt caused the failue or if that was a consequence of somethig else. I use 93 octane premium gas mixed at 32:1 with Stihl 2-stroke oil mixed at 32:1.
