GOOFIT 44mm Cylinder Carburetor Air Filter Ignition Coil Set Big Bore 53cc 54cc Top Kit of Piston for 47cc 49cc 2-Stroke Engine Pocket Bike Atv Quad Motocyle Red

What can I say. Very nice kit overall and you can feel the difference in performance over the stock engine. I had to add a base cylinder gasket though because the piston was hitting the cylinder head. I wish they would have provided a throttle cable for the carburetor because my stock one would not fit so be prepared. All in all, 100% satisfied!!

The head is not perfectly level, I can feel the piston getting caught up when I tighten it down completely.. might wear in but I’m having multiple issues.Bad stuff:1) the head might need to be leveled2) the carburetor needs the stock jet changed out to a smaller jet, I swapped for a 65mm and it’s better but I’m gonna try a 60mm.The bike was getting way too much gas with the stock jet, like I was full throttle..3) the carb throttle connection is a weird one. You put it through the front and hang the knob out the hole and it fits in behind the slide into the carb. I shoulda took pictures to help people like myself.4) The throttle kinda sticks I feel like the spring is too soft..5) Bike wants to go without touching the throttle,6) bike will only idle with choke on, its kinda hesitant, then gets spurts of power, then wants to die if I let off the gas when riding. maybe due to uneven head and piston sticking…Good thing is, definitely more power!Phone said 26 but I didn’t max it out cause of the new build. Wanna figure out the tune and break it in before trying to hit max speed.I shoulda just got the red version due to the fact that it matches the rest of the aftermarket parts that are available on Amazon, not many gold accessories or deals on what there is.Might just return it if it gives me problems for more than a week.. it’s the same size 44mm piston as the stock piston, both are 44mm, only difference is 2 little windows bored out of the side of the new one. Could easily be dremaled out of the stock piston.I’d recommend just a 47mm head and piston kit, and doing some research on tuning and improving your stock carburetor or the NP carbs, they are much more tuneable than these HP carbs, I think you could get the same effects if you figure it out, I might have to go back and follow my own advice here.Waist of money for my case, so far anyway I’m not happy with the kit.

Very good product so much power and I'm 236 lb got me up to 40 -47 miles per hour

Everything fit, and worked. Bike has better mid range acceleration and a higher top speed after installing these upgrades, engine has more compression as well. I did have to experiment with different size carb jets, and had to adjust the idle a bit to get the engine running perfectly. Great bang for the buck.

I put this kit on a 50cc 2 stroke motor I bought off Amazon and you can tell a big difference. Only suggestion is to make sure not to over tighten the carb intake flange bolt it will snap. Youtube how to install the kit. Really simple once you dive into it

So I’ve had a lot of issues already. I originally got this kit and one of the piston rings were broken in half so I had to return it to get another kit. I’ve just recently got the new kid and I’ve realized it doesn’t fit my crankshaft. Luckily go fit has a crankshaft that supposedly works for you, I hope you are hands-on with turning wrenches because this is going to be a project in all pretty good for the price. The carburetor is excellent and it seems to be pretty high-quality for the price.

The media could not be loaded. Everything fit besides the carburetor other than that so far so good more power sounds great The most important part is tuning your engine. If you run it to lean the motor will blow up at the moment will buy again

Received the product and it looked good overall. Put it together and there’s absolutely no difference in performance. I measured the piston/cylinder and it’s the same size as stock. It is not a “Big Bore Kit”. The carburetor that comes with it is complete junk. Would not buy again.Update: after some monkeying around with the carb, cable wire, I got it running good. Not a true big bore kit but did make a big improvement.