50cc performance upgrades

4T_Goblin · 08-05-2021, 08:12 PM

Edit: the middle pipe arrived and I installed the new muffler. Sounds better now. Looks nice.

https://youtube.com/shorts/UNXdXOLKlRY?feature=share

I'm looking at ways to get a little more out of my 50cc bike.

I bought an exhaust slip on that I think looks decent and am hoping sounds good and gives me some better exhaust flow.

I started looking at intakes... To see if it matters if I get a larger diameter pipe. There's not a whole lot for this size, perhaps a 70cc kit. Sounds interesting but I do not want to machine anything on my own. If it's screw on and play then I will consider it.

Made it to 45mph yesterday. ��

The engine is a 139FMB . I have a beefy 20mm mikuni carb I meant to test but I'm going to hold off until the current $11 pz19 carb fails.

Let me know if you have some ideas. Thanks

4T_Goblin · 09-15-2021, 09:24 AM

I ordered an aftermarket exhaust from Venom Motorsports and installed it on the 50cc yesterday.

I jetted up on main to 78 from 75, and up on pilot to 36 from 35. I do get lean bog when I snap the throttle open but it rolls super smooth and sounds clean. There is some back pop on deceleration. Sounds great lol.
That spare pz20 I have laying around is actuality a vm22 which will go on the x-7 when I do the emissions delete.

The pipe sounds nice. Once the sun comes back I'll do some riding

08-05-2021, 08:12 PM	#1
4T_Goblin Join Date: Jun 2021 Posts: 239	50cc performance upgrades Edit: the middle pipe arrived and I installed the new muffler. Sounds better now. Looks nice. https://youtube.com/shorts/UNXdXOLKlRY?feature=share I'm looking at ways to get a little more out of my 50cc bike. I bought an exhaust slip on that I think looks decent and am hoping sounds good and gives me some better exhaust flow. I started looking at intakes... To see if it matters if I get a larger diameter pipe. There's not a whole lot for this size, perhaps a 70cc kit. Sounds interesting but I do not want to machine anything on my own. If it's screw on and play then I will consider it. Made it to 45mph yesterday. �� The engine is a 139FMB . I have a beefy 20mm mikuni carb I meant to test but I'm going to hold off until the current $11 pz19 carb fails. Let me know if you have some ideas. Thanks Last edited by 4T_Goblin; 08-11-2021 at 03:50 PM. Reason: MPH goal achieved
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09-15-2021, 09:24 AM	#2
4T_Goblin Join Date: Jun 2021 Posts: 239	I ordered an aftermarket exhaust from Venom Motorsports and installed it on the 50cc yesterday. I jetted up on main to 78 from 75, and up on pilot to 36 from 35. I do get lean bog when I snap the throttle open but it rolls super smooth and sounds clean. There is some back pop on deceleration. Sounds great lol. That spare pz20 I have laying around is actuality a vm22 which will go on the x-7 when I do the emissions delete. The pipe sounds nice. Once the sun comes back I'll do some riding
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