How to Install a Big Bore Kit - HD Video

Learn how to install a big bore kit on your QMB139/GY6 50 scooter the right way — step-by-step, no guessing, and no confusing “service manual” gaps. This complete DIY video download walks you through the process so you can save time, money, and headaches.

The Details

This digital video gives you everything you need to confidently upgrade your scooter’s engine at home. We’ve spent years learning the tools, tips, and tricks required to get reliable, smooth power out of these little motors — and now we’re handing that knowledge directly to you in a clean, easy-to-follow install guide.

Anyone with basic hand tools can install a big bore kit — whether you’re going 70cc, 80cc, 90cc, or even 100cc. This isn’t general talk: the footage shows every step clearly so you know exactly what to do.

Important Things to Note

• Instant digital download — no physical copy shipped
• Covers QMB139 / GY6 50 four-stroke engines
• Great for TaoTao, Znen, Wolf, Peace, Roketa, Bintelli, and other 49–50cc scooters (full list below)

Supported Models (examples):

• QMB139 / 139QMB
• TaoTao 49/50cc
• Roketa 49/50cc
• Puma 49/50cc
• SunL 49/50cc
• Wolf/Gorilla 49/50cc
• Znen 49/50cc
• Tank 49/50cc
• Peace 49/50cc
• Bali 49/50cc
• Linhai 49/50cc
• CF Moto 49/50cc
• Xingue 49/50cc
• Zongshen 49/50cc
• Bintelli 49/50cc
• X-Treme 49/50cc
• Schwinn 49/50cc
• Lance 49/50cc
• Jonway 49/50cc
• Baccio 49/50cc
• Panterra 49/50cc

What's Included

• Full big-bore installation video download (approx. 45 minutes)
• Tips and tricks from experts who’ve built hundreds of GY6 50 engines

Want the parts to go with it?

• Shop 80cc Big Bore Kit
• Shop 90cc Monster Kit