taco eater :
Kurt Dominguez from Lake Havasu City, AZ United States
Uprgrading to better piston. Not really happy that I didn't even get it to barely turn over before I could hear the noise that we all hate to hear. Lucky it didn't scar the cylinder wall. l wish I could be riding my 78 Express right now. just disappointed...
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Can't go wrong with more power baby
April 24, 2025
taco eater :
Anonymous Person from WILMINGTON, DE United States
Remember to trim those fins before installing. Nc50 78'. An exhaust will really help you feel the power band this cylinder gives.
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Damaged
April 29, 2024
taco eater :
Avery Kempf from Waupaca, WI United States
Packaging was great, foam box inside a box inside bubble wrap and all. Until I opened the package all the way to discover the head gasket was bent into a taco and one of the piston rings was broken into three pieces. Rough as it is I'm just upset I have order replacements and wait longer than I want to.
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Fits perfectly on 1982 honda urban express
August 8, 2023
taco eater :
Mickey Haddox from INDIANOLA, IA United States
Fit my 82 urban express and required no modification of fins with the derbi head. Haven't gotten in dialed in yet, but already put my top speed up to 38. It will get faster when it isn't running so rich. EDIT: Got a people's pipe on it and stuck a bx31 on and she'll go 50, still has more, but wheel bearings are scaring me.
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Fits my 82 NU50
May 10, 2023
taco eater :
Allie from Mesa, AZ United States
I bought this kit to upgrade my NU50 from 50cc to 70cc. This with a larger carb jet, BX31 belt, and MLM stock pipe, I gained 15 MPH on the top end and got a lot of my low end back.
Piston and Rings were done first turnover 
Can't go wrong with more power baby 
Damaged