Yes, Alex, OP has videos of the needles going up when they feel the vacuum of the engine (another thread).
Quote:
Originally Posted by xaple
........
When I start up the bike I get a nice good idle.....
when I turn the throttle fairly fast the bike responds well.
If I slowly turn the throttle the engine seems to run super rich and flood.
.....
when the choke is on and i slowly give it throttle I get the same result.....
when I slowly give it throttle and it starts to bog down the idle drops really low and either stalls or recovers.
Once the bike stalls I can not get it to start back up again unless I hold the throttle open max.
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As over-rich mix only happens when the butterfly is opened and
sustained engine vacuum reaches the Ventury, IMHO, it must be either those float valves that fail with vibration (temporarily flooding one or both bowls) or a case similar to that old thread where the guides of the needle were missing.
It seems to me that the oil should be contaminated with fuel at this point.
Maybe @
choneofakind could remember if these symptoms could be related to enlarged P compensation holes in the slides.