TBParts - 141cc Big bore kit
14mm Pin

Installed this kit along with the Tbolt cam and spring kit on a 2019 Vader. All the parts were very nicely made and arrived in perfect condition. With a bigger carb and exhaust It provides big power increases throughout the RPM range and in the case of my Vader it lets the engine rev to the end of the tachometer with the stock CDI. I have put about 600 miles so far and for the first two hundred miles it ran better and stronger each road. I am happy to say that there is not a single oil leak, no smoke and no unusual oil use. It brings the Vader to life and is kind of a mush have upgrade.

I put this kit, along with the YX140 cam and valve springs on a 2019 Vader 125. With a bigger carb and custom exhaust the Vader is much stronger form the low end right up to a surge of power and torque in the upper rev range. All the parts are quality and went together perfectly.

This kit works perfectly for a 2018 Vader/Boom/Boadiao 125CC. I paired this kit with the race cam for big valve heads and a Mikuni VM 26 carburetor. Prior to installation, I could barely reach 50mph. I have about 100 miles on break in so far and I was able to hit 60mph with ease. I can even accelorate speed uphill in 4th gear now. Power wheelies in 1st gear are rediculously easy now. I can’t wait to see what this thing can do after break in!

Next step for my grom clone is a performance CDI. (The rev limiter kills the top end now) and 18t front sprocket. I think I will be able to hit 70mph with ease and cruise at 55 without wrapping the bike out. Highly recommend for the price.

When I decided to freshen up my semi-auto Lifan "125" (actually 120cc despite what the jug says) Vince talked me into using this kit instead and also told me to try this cam (WHS-1638 w/sprocket and valve springs), telling me "you'll be happy". I already had a 22mm Mikuni on the bike along with an oil cooler.

Whoa.

This setup makes some serious torque!! How much? When my bike (a Honda Passport) was geared 15/36 wheelies were a problem if I gave it too much throttle coming away from a light. I added two more teeth on the front which gave me more top speed and eliminated the front end constantly coming up.

Guess what? With this big bore kit and cam the wheelies are back!! It also gives me enough power to pull hills going away in high gear that a friend with a very similar bike and a stock motor has to drop to third to climb.

It's rare when it doesn't start on the first kick, idles fine and doesn't seem to run hot at all. My bike often sees stop-and-go city traffic and this might be the ultimate urban weapon.

I'm impressed. This is one helluva combo and I highly recommend it.