Rotax 582

Dear Tech Guy!
Gordy,
I talked to someone at Airventure a few weeks ago from Rotax that said there were 582 snowmobile engines it may even have been you??  But I found your email on a website regarding Rotax topic.  So you say there definitely was a 582 snowmobile version?  Can we say for certainty that if the engine I have has only 1 spark plug per cylinder that it is the snowmobile version?  Or did they make the aircraft 582 with one spark plug at some point in the past?
On the engine it has Bombardier GmBH, Gunshirken, Mot Nr. 4078165 Bore 2,76 mm Stroke 64 mm capac 580,6 cc Type 582 Made in Austria
It has Bombardier and Rotax stampings all over the engine.
Lastly, didn't the ultralight guys use the snowmobile engines in the early years back 20 years ago?
Thank You,
Greg Otto

Tech Guy Responds
All UL 582's have dual ignition since day one. All Snowmobile engines have single ignition. The 532 UL  had single ignition however. The 582 was built in two different versions for  snowmobiles. The one with a variable exhaust or RAVE valve produced around 100HP at 7800 RPM. This is normally not suited well to UL use. The detuned version produced around 90 HP at7500 RPM and the port timing is similar to the UL. The rotary valve timing and port timing and single ring piston used on Snowmobile engines is designed for High HPat high RPM applications and not the high torque good fuel economy normally associated with UL use.
I hope this helps a bit more in determining what type of engine you truly have.
Gordy