Christof13T wrote on 02/10/18 at 13:46:45:The video finally finished uploading...
This is what is
was doing...
https://youtu.be/L_lxU2JgeyEI pulled that cone filter off and put the pancake in its place at the end of the pvc pipe sticking out of that side of the elbow... made no other adjustment and tested it... some improvement but it still cut out around 35 in first under hard acceleration. at 45ish in 2nd.
came back to the house and turned the mix screw out anoher half turn...
tested it again and it now runs through all the gears under hard accel up into the 70's pretty easy...
WHAT GIVES!!???
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I just watched the video and I'm not even sure why people were bringing up jetting. Jetting will not fix a mechanical problem. Fix the issue and then address the jetting.
I'm pretty sure the main issue, which you alluded to, was that the slide was not opening. When you open the throttle, it opens the butterfly at the mouth of the carb. This increases the vacuum that SHOULD be opening your slide which raises the needle and pulls more fuel and air. In the video, it sounds like you are just pulling a little more air into the engine and it is mostly running on the pilot circuit.
You probably fixed it right when you did the white spacer mod again. If it happens again, pull the air boot and watch the slide. It's probably not opening much at all. You should be able to raise it with a screwdriver (or your finger if you don't mind burns if it backfires).
If it doesn't open, make sure the diaphragm is seated correctly and not damaged. Also, make sure the slide isn't worn and dirty. Same with the inside of carb where the slide rides.
This happened to me. I didn't have the diaphragm seated properly. The bike wouldn't go past 20mph. Then later in the season, the slide started sticking at mid throttle periodically when the black coating on wore off and caked up in the body. A $125 slide and a good cleaning later, my bike ran fine.