Sounds like the progression holes are partially plugged in the carbs. If you don't completely disassemble and soak for 3 hours, you are wasting your time. Save your money, spraying carb cleaner does not clean the carbs. They all have simple carbs, but, they must be clean to operate properly.
My procedure is:
1. COMPLETELY disassemble the carbs
2. soak all metal parts in carb cleaner for 3 hours
3. Remove from carb cleaner and rinse with water
4. Check ALL passages, jets, pickup tubes, EVERY hole in the carbs with compressed air to insure cleanliness. Blow air through ALL passage and holes, including screw holes.
5. Reassemble and adjust air idle mixture screws CORRECTLY.
6. Reinstall carbs on intake.
7. Synchronize the carbs.
8. Add water and enjoy.
I usually also remove the intake to make sure there are no split, cracked, or broken reeds.
I have never had to "re-clean" the same carbs in over 30 years of doing this. Maybe at a much later date, like after the unit sits up for months, but never had a problem after following this procedure.
The ultrasonic cleaner is second to none, but, we don't all have them.
D
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