- Mon May 14, 2018 7:56 pm
#76785
Hi Guys -------- that's the EFi model with UCE gearbox ??..........OK, well short of spending the rest of your life employing "Urban Myth" changing methods when out riding with "The Lads", let's get down and technical ( for that's what's at the root cause of this behaviour ) and apply a few of those leetle grey cells..........
This box is very similar in concept and construction to the 5-speed box that was fitted separately onto the Bullet '65 and others...........ie, a foot-operated pawl & ratchet mechanism that operates a rotary camplate whose machined channels operate sliding gearwheels and dog clutches which in turn are on a mainshaft and a secondary shaft................In the '65 model the camplate is vertical and at the rear of the box whilst the UCE one is horizontal and placed over the mainshaft etc...When you change gear then one of the two pawl and ratchet mechanisms will come into play...........UP for up change and DOWN for down change...........Both pawl arms normally have an adjustable stop to prevent overthrow BUT I know that in the case of the Bullet 65 they are not fitted..........I suspect that the UCE box will be the same, but I've yet to actually strip one fully...There is also a heavy duty centralising spring.............In your case the "Neutral" that appears is usually the one between the next ratio down---and the one after that--ie you've overthrown past the gear you want to select and are in a false neutral, as it were......................So why are there these "false" neutrals you might ask ??..........If you were to select two ratios at the same time then the box would lock-up and the clutch will probably rip it self to bits in the process.........................Hydraulic ( or Pneumatic ) Sequential Control on epicyclic boxes has a very definite "Neutral" between each ratio to protect the brake bands from being severely damaged.........At this stage I'd like Paul Henshaw to show us some of his videos on the UCE gearbox.....I've looked but can't find them !!....................