I have a Yamaha RX 135 which is a 2 stroke bike, and I have replaced it's carburetor , Previously it was stock 26mm round slide mikuni carb , and its been replaced with 30mm Flat slide mikuni.
After replacement bike runs very fine and and there a lot of improvement in higher end after replacement, However when I suddenly try to open full throttle, The engine makes a deep booooo sound like no air is sucked in or its being choked like bike is running out of of fuel.
Also when doing high speed , when I keep my throttle completely open, as soon as i reach my top limit, engine again stalls and looses acceleration but when using like 70-80% of throttle bike runs very well.
My main and pilot jets are stock I believe which is #17.5 pilot and #115 on main.
Can anyone please explain my why this is happening?