That’s good, can you do a video of how it does what it’s doing.
It must be in a lower gear or it would not take off in taller gears,do you know who had it before you so u can ask if it was like that or if it actually just did it.i tested on a stand as you asked and it shift down as it should tier turned i shift it up one released the clutch nothing out of the ordinary rived motor tire spun let rpm drop and it wont shift up anymore but will shift back down but you cant wind the gears out so i thought that it had to be on the ground and moving to make shift right does the same thing its like when you shift up once you are at top gear and you are trying to get another gear but there is none there is no stall as if you go to first to fifth shifts smooth
I had a 1980 Honda CB900C that had the transmission you are referring to. It had the regular 1 down 4 up shifter and then a secondary shifter for overdrive that you hit with your heel. It was really fun to ride. I don't know if they made it in a 1000 cc variety but if you find a 900 im sure you could change the jugs and get it to 1000cc.A 1978 Honda gl1000
thank you ...........lolThe suggestions given are good, I think you may either have a maladjusted shifter...the one your toe operates, or possibly internal corrosion limiting the movement of the shifter shaft. If you have two motors doing the same thing, I'm wondering if they had the same prior owner. He may well have adjust the shifters to adapt for his own use on both engines. That shifter should be close to horizontal when at rest, if not then something is preventing it.
And for pete's sake....use the period when writing. It's almost impossible to read it the way you're posting. It's like talking for five minutes without taking a breath....which nobody does(excpet for my aunt Sophie). Her teeth fell in the washing machine one day and chewed up half the load before she could get them out. 😄