I tuned it and took it for a spin without the air box it ran awsome up untill about 6000rpm then it fell on it's face (boged out) put the air box back on and wamo it was back to normal.Cheer's Kirk. Ski Doo for Life
Hi there.I'd love to dyno my 521 I have two of them 1991 formula plus the one sled has a modified cann both sled's I've done a totall rebuild wow do these motor's ever rock.They both blow away tripple's for fun mabey not top end but good luck catching me lol.No wonder ski doo stopped making them I heard that it was a beter motor than the 617 and 583.I was watching your vid and was wondering if the motor would run beter with the air box on.I've tuned my sled but won't run right without the airbox
I tuned it and took it for a spin without the air box it ran awsome up untill about 6000rpm then it fell on it's face (boged out) put the air box back on and wamo it was back to normal.Cheer's Kirk. Ski Doo for Life
CrazyCurtass 2 months ago
Hi there.I'd love to dyno my 521 I have two of them 1991 formula plus the one sled has a modified cann both sled's I've done a totall rebuild wow do these motor's ever rock.They both blow away tripple's for fun mabey not top end but good luck catching me lol.No wonder ski doo stopped making them I heard that it was a beter motor than the 617 and 583.I was watching your vid and was wondering if the motor would run beter with the air box on.I've tuned my sled but won't run right without the airbox
CrazyCurtass 2 months ago
the old 521cc type 537 & 534 were some of the best sled engines ever built. GREAT vid.!!!!!!
modtodd82 6 months ago
wow!
pantherxx010 1 year ago