I have a rough spot in the rev range right at 4,000RPM, can't replicate it anywhere else, the motor sputters and surges...
Here's my theory: based on the original front tire being totally worn out from the crown in the road at 7800 miles I think the PO was a commuter. He basically got on the freeway, jammed up to 5th or 6th gear and locked it down at 4kRPM drove on for 70/90 whatever miles/ day after day, rain or shine.. The bike shows some wear to the rubber stuff, it was in the rain.. (I think in Indiana).. that spot on the TPS got a little worn or notched from always running 4k.. hence the stutter at only that spot.. what do you think?
I replaced it tonight w/a HD TPS (cost 34. +7 shipping) took a quick test ride after resetting the base level at 150mv and checking the idle setting (it was 482mv or something) I'll refine that this weekend. it didn't do the symptoms now as I rode a steady 4,000rpm in both 2nd and 3rd gear. am I right and have solved it? time will tell.
One kind of disturbing thing was under the TPS the butterfly stem etc was RUSTY! should I worry?
here's what I used to fix the speedo mounts that kept falling apart.
I have two week vacation starting NOW... hope to ride a lot on both my working Guzzi's.