Squirrel is probably right that you are chasing windmills in trying to fix this small spike.
At idle the throttle plates should be all the way at the bottom of the slot. If you do not want to drill the throttle plates another method is to raise the secondary plates by adjusting the secondary idle screw. You have to take the carb off to adjust it so it can be a pain but it will allow you to see if the transfer slot helps without permanently modifying the carb.
On the idle screws, you may find that reducing the idle restrictor will help with adjustment and might allow you to lean the idle mixture better.
At idle the throttle plates should be all the way at the bottom of the slot. If you do not want to drill the throttle plates another method is to raise the secondary plates by adjusting the secondary idle screw. You have to take the carb off to adjust it so it can be a pain but it will allow you to see if the transfer slot helps without permanently modifying the carb.
On the idle screws, you may find that reducing the idle restrictor will help with adjustment and might allow you to lean the idle mixture better.
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