If you figure it out, let us know. I have a dirt bike that acts the same way- idles, but won’t rev at all when carb is opened, even though I can verify carb is operating properly. I think there is a vacuum leak between the engine and transmission (it’s a 2 stroke) but haven’t really dug into, as 50 year old Yamaha engines aren’t my specialty.
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‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears.
‘55 Catalina
‘62 Mercury Meteor-all original, bought new by my grandfather
71' GTO -original 400/4-speed/3.23 posi
13.95 @ 102.1 on street tires @ 4055lbs.-now my sons ride
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