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Don’t think I ever knew throttle angle, I’ll check. I use a twin max for syncing. Very accurate. Has the witness paint on the TPS adjustment-screws been disturbed? I would think that the throttle plate should not be allowed to go to 90° or 0° as some “meat” needs to be left in to account for hysteresis. A quick search of the box of truth shows 5° at rest.
Are you reading ° mechanically or electrically?
You said the bike was operated in a corrosive environment. Have you shaken the TB-shafts at idle? You can do so by wiggling the bell cranks. Have a fire extinguisher for this test: direct propane onto any of the induction path to look for leaks.
Have you checked the pivot bearings?
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