Rough 912 still!
in 912 / 914 Technical Questions
9 years ago
I'm out of ideas on getting this 912 ul to run correctly. It starts fine and runs smooth for about a minute, then you feel a miss develop. It almost sounds and feels like a small Continental than a Rotax. It will continue to run rough until about 3300 rpm. It smooths out and make normal power but has an occasional miss in cruise. When you pull the power back for landing it runs rough again below about 4000 rpm.
The carbs have be rebuild by myself and a professional, the gearbox rebuilt, plugs changed and gapped filters changed, it been sync and sync (it runs rough with the vacuum gauges showing perfect sync on both carbs, I've richening and leaned the idle jet , raised and lowered the needle jet no change. Tracked and balanced the prop. Mag drop about 150 rpm same on both ignitions although it does seem to run slightly rougher on one. I've replaced all the plug wires and checked ing connections
Anyone have any ideas?
Thanks
Skip
The carbs have be rebuild by myself and a professional, the gearbox rebuilt, plugs changed and gapped filters changed, it been sync and sync (it runs rough with the vacuum gauges showing perfect sync on both carbs, I've richening and leaned the idle jet , raised and lowered the needle jet no change. Tracked and balanced the prop. Mag drop about 150 rpm same on both ignitions although it does seem to run slightly rougher on one. I've replaced all the plug wires and checked ing connections
Anyone have any ideas?
Thanks
Skip
