ProBld forged GY6 171cc (61mm)big bore kit
Here it is!! We are proud of this one! We have taken a Taida 171cc GY6 big bore kit and improved it! Now you can own an even better kit than Taida … Whaaat! This is our ProBld 171cc (or as some call it 172cc) Forged drop in big bore kit. I promise there is not a better 171cc kit on the market! There are two options when you choose a big bore kit, forged or cast. Forged is what you want if you run your engine hard. We offer our Rolling Wrench 171cc kit in cast as well if your not a hotrodder or if this kit is out of your budget (same features, just cast). Our kits come standard with the piston rings measured and installed on the piston. Not only that, we install the piston into the cylinder for you. This takes a ton of the tedious work out of the Install. We have also included 2 base gaskets, one thicker base gasket for lower compression (higher top speed less torque) or a thinner gasket (more torque less top speed). Oh ya, and comes with a timing chain tensioner gasket unlike most kits on the market. And finally our kits are flat top forged pistons. This is much better for top speed (higher RPM) and start ups. This drop in big bore kit is one of the best bangs for your buck in performance. This 171cc no case boring big bore kit is the largest big bore kit you can go on the GY6 A motor (Chinese GY6 qmj157). Like they say “There is no replacement for displacement “. If you want to add the performance cylinder head (click here). For the money this kit flat out rocks! We even have a install video! We would recommend adding a cam shaft (click here). You can even add a performance carburetor, but it’s not a necessity. (Click here)
You may find other kits for half the price online, but note they are made in China. The ProBld kit is made in Taiwan using both Japanese and Taiwanese parts. There is a HUGE difference in quality.
ATTENTION BUGGY OWNERS: WE HAVE NOT PERFECTED ALL THE GY6 ENGINE MODELS IN THE BUGGIES TO KNOW IF WILL FIT OR NOT. BUY AT YOUR OWN RISK.
ONE MORE IMPORTANT NOTE! Our 61mm kit is a drop in kit. Others on the market are not and will require engine case boring.
THIS KIT HAS 54MM STUD SPACING (GY6 A)