Wow! Great Mod. 90cc Naraku Big Bore Kit on a Maddog 50cc 139QMB GY6. Way Faster
I installed and tested the Naraku 100.52 89.3cc BBK and Big Valve Head on a IceBear Maddog 49cc Scooter. I was torn between this and the Taida 88cc kit. Both are made in Taiwan and should be good quality.
How to Install a BBK: https://youtu.be/l5mQ4719ybE
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Non-Amazon Links
Naraku Big Bore Kit https://ncystore.com/engine-and-wiring/engine-parts/cylinder-head/naraku-cylinder-52.4mm-94.9cc-2v-cast-big-bore-kit-duo-combo-139qmb
NCY Cam https://ncystore.com/engine-and-wiring/engine-parts/camshaft/ncy-camshaft-2v-25.8-25.5-performance-139qmb