BoomCat BDS-125 carb set up

[Aecker]

Hello to all, just wanted to give a hand to anyone that need help with the carburetor set up on the Boom. Seen some videos on YouTube of guys running the stock set up and with some tuning the bike can run much better than stock.
Here what I got going.
Stock set up is a pz20 with very small jets, both jets are unmarked so can’t tell what size they are but I suspect they are #78 main and #26 pilot, I believe they are sized for a 50 or 70cc engine. This being a 125cc they are too small. Also the stock carburetor does not have a needle adjustment. The bowl screws are sealed as it’s the air adjustment screw, u can replace the bowl screws and pop the seal off the air screw, I did both. U can try re-jetting but I don’t recommend it because the lack of a needle adjustment and the pilot jet is very difficult to find, it has a unusual shape. The jets are 4mm tread not 5mm as most carburetors. So I decided to change to a pz22, this carb is about the same size but run slightly larger jets, the needle and piston is also larger however they are also unmarked, it uses 4mm tread jets not 5mm like the Mikuni, the needle has 3 groves for adjusting. This carb looks very similar to the original but does not have the carburetor gas shut off like the stock. The carb gas shut of is not necessary and ad complexity to it. All the hose hook ups are the same and it fits perfect in the manifold and air boot. U can run the Pz22 it as it comes and the bike will run better but not perfect, for that you will have to re-jet it. You can buy a Mikuni carb but they are more expensive and u will have to re-jet it also. So I decided to go with the Pz22 as it look stock and I don’t have to delete the charcoal canister. You should swap the spring that go on top of the carb piston, the spring on the Pz22 is softer than the stock pz20 witch is stiffer and gives the throttle a nicer feel. After playing with the jets I finally found a set up that works for my bike. You will have to buy the jet kits and they come with a few jets for you to play with, the jet kits run about $10/15 and the carb is about $25. The gasoline filter should be changed as it is very low quality and mine was collapsed inside and letting dirt go through into the carb. FYI every bike is different but this will get you close.
Hiaors Pz22 model Cb054-22mm from Amazon
Main jet is a 4mm tread #92
Pilot jet is a 4mm tread #30
Needle jet on lowest/bottom setting
FYI I’m still playing with jets sizes as I don’t ride the bike often, I’m still trying to up the performance as much as possible but so far this setting is working.
Air screw 1 1/2 turn out
New gas filter
No mods to air intake
Exhaust muffler end, mini baffle removed
Here some pics of the Pz22, the needle and the comparison of the 4mm jets to the 5mm jets in size, hope this will help