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Rotax 521 type 536

16K views 13 replies 11 participants last post by  HECSR48 
#1 ·
Does anyone know the HP rating of a stock 521 type 536? This has dual carbs and a single pipe. It came from a Ski doo Formula plus.
I've been searching all over the net and cant seem to find it.
 
#3 ·
75 is about right. The 536 was a detuned version of the 537, it has lower exhaust porting and a short duration rotary valve. This gives it very good low end torque and fuel milage.
 
#4 ·
I believe the 534 in my '83 9700 blizzard was rated at 86hp stock. This is with twin exhaust and 40mm carbs.
 
#13 ·
Does anyone know a magic number as to how much to plain the head on one of these engines? 537 with 40mm carbs, plained head and Crank Shop pipes would work pretty well...
 
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