taco eater :
Mike Boyd from Los Angeles, CA United States
Flat side goes out away from the magneto, and the machined lip goes around the OD of the magneto to keep it all perfectly balanced.
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Its a weight
July 19, 2022
taco eater :
Jacob Fulton from Minneapolis, MN United States
Its a weight. A boring but sometimes essential purchase depending on what motor you're putting it on! I put some blue loctite just to be safe - this thing coming off would be no joke!
Anyway, I threw this on my ZA50 alongside my new HPI because an HPI is what like 1/3 the weight of the stock flywheel? This weight serves to rebalance the weight a little bit on the ignition side of the crank and increase reliability AND as a benefit it also has a much more consistent idle - less chance of stalling and don't need to adjust the idle higher to compensate.
Performance wise, its still awesome. Revs up quick and very fast throttle response still. I didn't really notice a difference compared to my E50 with an HPI.
Stop reading and buy it!!
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v nice
June 18, 2015
taco eater :
Will caldwell from san francisco, CA United States
yes the flywheel weight is rad. dumbs down the snappiness a bit, prolongs the life of your crank bearings and improves clutch stall without the use of crazy still springs.
basically if you plan on running an HPI on a daily driver or for long distance this is the best thing ever
Make sure to mount it right! 
