Rotax 521 type 536 - Snowmobile Forum: Your #1 Snowmobile Forum

kmhemi · 05-30-2008, 09:41 AM

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.

**smallengineguy** · 05-31-2008, 06:17 AM

I've heard around 75 or so.

Jim Jessup · 05-31-2008, 09:10 AM

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.

snoeproe · 06-30-2008, 10:33 PM

I believe the 534 in my '83 9700 blizzard was rated at 86hp stock. This is with twin exhaust and 40mm carbs.