90cc Monster Big Bore Kit (QMB139) - ProBld

Here it is.....

The fire breathing ProBld monster big bore kit! If you are looking for the largest kit on the market, this is it! It's a true 90cc. Don't let the $30 Ebay and Amazon 100cc kits fool you.

This kit will convert your 49cc Chinese scooter, Kymco Agility or anything with the QMB139 engine in it to 90cc's. The 90cc is as large as you can go with this engine. This kit is great quality (made in Taiwan) you won't find a nicer big bore kit. Remember you pay for what you get! The stock cylinder head will not fit. The cylinder head supplied in this kit is complete with larger valves and bigger ports making it a performance head. The ports are as large as a 150cc scooter.

This kit includes:

Piston

Piston Rings (End gaps are already measured and installed in the piston for an even easier installation!)

Cylinder

Performance Cylinder Head (Complete with big valves)

Complete rocker box assembly 

3 Gaskets included with 2 base gaskets to choose from. (A head gasket (must use) Then either the thinner high compression base gasket to be used at higher altitude 5K and above OR the thicker low compression base gasket to be used at sea level.)

ADD THIS CARBURETOR TO REALLY BRING IT TO LIFE! CLICK HERE

This 90cc big bore kit will fit the models below

- Any machine with a QMB139 / 139QMB / GY6 50 (4-stoke) engines.

- All Taotao 49cc/50cc scooters.

- All Roketa 49cc/50cc scooters.

- All Puma 49cc/50cc scooters.

- All SunL 49cc/50cc scooters.

- All wolf / Gorilla 49cc/50cc scooters.

- All Znen 49cc/50cc scooters.

- All Tank 49cc/50cc scooters.

- All Peace 49cc/50cc scooters.

- All Bali 49cc/50cc scooters.

- All Linhai 49cc/50cc scooters.

- All CF Motos 49cc/50cc scooters.

- All Xingue 49cc/50cc scooters.

- All Zongshen 49cc/50cc scooters.

- All Bintelli 49cc/50cc scooters.

- All X-Treme 49cc/50cc scooters.

- All Shwinn 49cc/50cc scooters.

- All Lance 49cc/50cc scooters.

- All Jonway 49cc/50cc scooters.

- All Baccio 49cc/50cc scooters.

- All Panterra 49cc/50cc scooters.

To purchase the 45 min. install video click here

GY6 torque settings click here