taco eater :
Andrew Edwards from Vergennes, VT United States
like the guy below me, my magneto side failed gradually within 500 miles on my puch maxi. the viton seals are more reliable and only a bit more. save yourself the rebuild
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Multiple early failures
October 3, 2019
taco eater :
Anonymous Person from brooklyn, NY United States
These were my go-to seal for minarelli and tomos, and whatever else. I've used them on stock and mild bikes of my own, and for repairs of other peoples bikes.
But lately on my personal ripper tomos, these have been failing inside of 400 miles on the magneto side. Starts with a slow oily seepage, and eventually leads to loss of power and lean condition. I always take care to install them gently with plenty of lube on the inner lips. And the bearing is in excellent shape with no slop. Ive had to switch to Viton seals, at least for this bike. We'll see how it goes.
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Morini M101
December 6, 2014
taco eater :
Ben Schulz from Detroit, MI United States
Morini M101 use these.
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More Morini Love
June 2, 2010
taco eater :
Patrick Sison from Chicago, IL United States
Morini and Minarelli both use these crank seals. Rebuild, rip, repeat
early fail 
Multiple early failures 
Morini M101