912iS Battery not charging but engine stops when load applied

Jeff B, thanks for the reply. We had our Stator replaced on our 1st engine under SB-912i-006 but the latest engine, we assumed that the Stator was already a beefed up one, because of the later S/N. I has never heard of a spray bar in the Stator Housing only in the Gearbox, are you sure this is correct because out UK Rotax Agent never mentioned it and I can't see it in the Maintenance Manuals.

Its still a worry that the windings are breaking down with such a light load on them, is it excessive temperature from the engine. I am an Electronic Engineer and we know how to specify high temperature insulation on wiring, it seems to be a fundamental mistake on someone part.

Malcolm,

I am sure about the new oil spray nozzle, though if you have a newer engine (2020) it may already have it.  See service bulletin:  https://legacy.rotaxowner.com/si_tb_info/serviceinfo/si-915i-008-r1.pdf    I just did one of these upgrades two months ago.  

Found the problem, the Stator has burnt out. We are only pulling 6A max. so I don’t think it’s an 

electrical overload. We have had major vibration issues which come from the gearbox, I think the

enamel on the stator winding wires has worn through and caused a short-circuit. I will strip the 

stator windings down and investigate when I get time.

Malc

Jeff B

Thanks for the info. Our Engine according to the Serial Number should have it fitted. I will

contact the Rotax UK Service Centre.

Malc 

That looks like heat damage to me.  I’m curious what RPM you normally cruise at? The last one of these I saw the pilot routinely cruised at 5450 RPM and I’m starting to wonder if that is a factor.  Higher RPM means the alternator produces more energy to use or shunt… just thinking out loud.