My Rotax 914UL only logs about 108 hrs. Recently a power fluctuation situation just develops when the manifold pressure reaches about 30" Hg. It's the start of turbo range. And the engine will suddenly accelerate all the way up to higher than 40" Hg and then drop back to around 30" again. This cycle will repeat again and again when in turbo range even I throttle up for higher manifold pressure. But, if I throttle down to less than 29" Hg, the engine is running smoothly. If anyone has experienced the same situation? Or if anyone could tell me the cause? Thanks.
