While you got it apart.......
Doing this will isolate some variables and make any further trouble shooting easier if any other problems occur.
Backing off the throttle arm stop screw so that just the little nub on the screw or just a couple of threads show on the back side of the stop screw black support brace should be a good mark to measure.
Next, run your throttle cable like it would be installed on your bike,(with all the bends in the cable) but do not have it hooked up to the engine/carb. Twist the throttle grip and make sure the cable runs smooth in the cable housing and does not get hung up with any bends in the way you have it run to the engine. You might wanna add some 3&1 oil inside the cable housing, so that the cable is lubricated, but make sure you clean off any access at the ends so it does not attract any dirt/grime.
Then, rig it up like you are going to run it, start engine, and adjust idle screw.(the one that has the spring on it) so that your engine sounds like cat sitting on your lap with its motor running(purring) while your petting it. Not too much( or the cat sinks his claws into your leg) not too little(or the cat keeps looking at you to pet it some more).
I have the same/similar engine. It has lots of power, gearing this inexpensive engine properly will make it outshine expensive engines that have fixed gearing.
This should give you a decent foundation to build upon.
Doing this will isolate some variables and make any further trouble shooting easier if any other problems occur.
Backing off the throttle arm stop screw so that just the little nub on the screw or just a couple of threads show on the back side of the stop screw black support brace should be a good mark to measure.
Next, run your throttle cable like it would be installed on your bike,(with all the bends in the cable) but do not have it hooked up to the engine/carb. Twist the throttle grip and make sure the cable runs smooth in the cable housing and does not get hung up with any bends in the way you have it run to the engine. You might wanna add some 3&1 oil inside the cable housing, so that the cable is lubricated, but make sure you clean off any access at the ends so it does not attract any dirt/grime.
Then, rig it up like you are going to run it, start engine, and adjust idle screw.(the one that has the spring on it) so that your engine sounds like cat sitting on your lap with its motor running(purring) while your petting it. Not too much( or the cat sinks his claws into your leg) not too little(or the cat keeps looking at you to pet it some more).
I have the same/similar engine. It has lots of power, gearing this inexpensive engine properly will make it outshine expensive engines that have fixed gearing.
This should give you a decent foundation to build upon.