This is just a 5 year reminder that the original regulator (by Ducatti usually) used in both 2 stroke and 4 stroke Rotax are all but USELESS - I could only recommend Claus Gimm "Powermate" regulators - I first fitted one to a 501 rotax prob 15 years ago and all of a sudden batteries last 5 years and more instead of 18months.  Also usually zero radio noise if everything else is done right.
 
Rotax and Jabiru engines (unlike Limbach and car engines) have  power generated by revolving permanent magnets and so they generate all the time and thus energy must be got rid of via large fins when battery is full.  I like to mount Powermate in a well vented area out of engine compartment.
 
For what it is worth notice Ducatti Bikes do not use Ducatti Electrics - think that tells a story. 
 
I first learnt about Powermate when I noticed about a dozen Ultralights/tricks I looked at in a row all had Yellow Powermate regulators and those guys are not renowed for waisting money. 
 
I have no deal with Claus but can not beleive how people keep using those useless Rotax  regulators (the one used on 501 rotax to me looked like an off the shelf bridge rectifer)  and just keep buying a new battery every few years
 
Ian McPhee (skype   macca304)
Box 657
Byron Bay  NSW  2481  Australia
Tel +61(0)2 66847642 mob +61(0)428847642
[EMAIL PROTECTED]
www.mrsoaring.com
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