Should do exactly wwhat you wanna do then..Here in CA the “cruising” speed on the freeway is 80 so 85-90 is regular day riding. Plus running down to LA, AZ or over the Reno or up to Seattle is often so having the 6 gear would be very nice.
Race this gearing is an OD unity 0.86 sixth gear.
I beg to differ on your pinion on Ultima I have a hotrod 90fxr with a 107 s&s with the 6Ultima ad never an issue. Unless going to a wider swingarm and chain final for a 200 tire is a problemdepending on which gear ratio set your 6 speed has,,, determines the differences..
an O.D. 6 speed,, will have a .86 or .80 6th gear,,, 1st gear can be 3:24 or 2:94,, the other 4 gears are the same ratio as the harley gearset.
a plain 6 speed,, depending on the manufacturer,, can have any combination of gear rztioz,,, many having 6th as a 1-1,,, these gearsets,, just add another short, to arrive at the same point in 6th as you had in 5th before..
ultima transmissions are hit or miss as rare as quality is concerned.. as mentioned already clearancing my be necessary,, as the shift forks are thick on the shaft end,,, due to them being cast... on mny ultima trans Baker shift forks and drum may be exchanged for the ultima set,, as well as the shift shaft with stops built in... this fight and up the very long throws of the ultima shift mechanism. some have shifts so long it feels like you went back to a pancake top 4 speed...
I dont use ultima transmissions... they may be ok on a stock engine,, but add some power,, and problems may arise,,,
I've worked on enough ultima transmissions to have formed this opinion,,, I see what looks like casting flash on the flat edges of some if not all of the gears,,, I wondered how they could be made of 8620,, and my conclusion was,, that scrap and machining droppings were re-melted then cast,, to decrease materials costs,,, this would be considerably less expensive than buying bar stock 8620,,,, can't prove it,, but???
Baker gears and shafts are cut from 8620,,(by andrews), and look perfect,,
it would seem ignorant to me to spend more on the shift mechanism than the transmission cost.. I would save up for a Baker kit, and be done with trans issues forever..
Maybe I should have been more clear tall terry. I have a 6 speed in a five speed case. However... I have had zero issues with it for 17542 miles. I get what your saying but I have had no issuesmisterfred,differ all you like,,, no problem....my point is that the quality is all over the board,, inconsistent is my observations the only ones i see are ones with problems... not all have the same problems... then getting replacement parts is problematic... sometimes Harley or Baker parts can be substituted if the mechanic knows what he is looking at...
ultima trannies are a crap shoot
so,yeah it.will last a while,, behind any engine but it will break at some point,,, the 5 speed is a copy of harleys trans,,the 6 speed is a copy of the eaarly baker trans... the gears anshafts appear to be cast,, whereas bakers are machined from bar stock...