6-speed gear box in a 5-speed case - Ducati.ms - The Ultimate Ducati Forum
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post #1 of 21 (permalink) Old Jan 5th, 2007, 10:10 pm Thread Starter
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6-speed gear box in a 5-speed case

Would it be possible to convert the 750ss 5-speed gear box to a 6-speed gear box using the same case? We convert our racecars, but the tranny's are pretty different. Does the 900 use the same case as the 750?
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post #2 of 21 (permalink) Old Jan 6th, 2007, 2:09 am
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The 2003 Ducati Performance catalog shows a "complete six-ratio gearbox for small casing engines (5 gears)..." for SS/Sport 750 MY '98 and later. The description of the gears is limited and no ratios are provided. Maybe others on this list can chime in with more details...

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post #3 of 21 (permalink) Old Jan 6th, 2007, 7:51 am
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I don't know about Ducati but I had a KTM 500, which was a 4-speed but a 5-speed conversion was available simply by buying and fitting the extra gears.

The same gearbox/shafts were used on both 4 & 5 gear models, I doubt Ducati make 2 different cases so would imagine it is a straightforward conversion?


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post #4 of 21 (permalink) Old Jan 6th, 2007, 9:50 am
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The small case six speed, I belive originally found in the 400ss primarily imported to Japan, will fit straight in. So the tranny from any 800 or non-dark 620m, or even MTS620 will work (though I could be wrong, as the 620 has that funky "slipper" clutch and might have a different input shaft because of it). I assume the 695 will work as well. They do come up on ebay from time to time. For a complete breakdown on ducati gear ratios, go here- http://www.moto-one.com.au/performance/ducgearing.html. Brad Black really knows his stuff.

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Penske shock, 14-42 gearing, '02 alloy swingarm
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post #5 of 21 (permalink) Old Jan 6th, 2007, 9:58 am
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As has been said. 6 into 5 does go. Quite a few of the lads in the DesmoDue race series in the UK do exactly this.

2 cylinders are all you need but 3 is a nice compromise
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post #6 of 21 (permalink) Old Jan 6th, 2007, 10:50 am
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I have a small case 6 speed into my '01 750ss. A 6 speed from an 800ss will fit also.

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post #7 of 21 (permalink) Old Jan 6th, 2007, 11:37 am
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Quote:
Originally Posted by 1fast750ss
I have a small case 6 speed into my '01 750ss. A 6 speed from an 800ss will fit also.
What effect has this had on the bike? From what I can gather, 5th has gone from an overdrive gear to a drive gear. With 1-3 being almost exactly the same ratios, does it just add to top speed or does it help in any other ways?

I looked at the site and numbers like that make me gloss at the eyes....guess that's why I sucked at math in college...
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post #8 of 21 (permalink) Old Jan 6th, 2007, 12:23 pm
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I think you'll find the biggest change is acceleration through the gears.

2 cylinders are all you need but 3 is a nice compromise
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post #9 of 21 (permalink) Old Jan 6th, 2007, 12:25 pm
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If you look at the Gear Commander web site and compare the 750ss to the 800ss ratios, they are nearly identical through 4th gear. 5th on the 750ss is a little taller than 5th on the 800ss and 6th on the 800ss looks like an "overdrive". I'd think that you could increase the size of the rear sprocket several teeth to effectively "close up" the gear ratios of the first four gears while keeping 6th gear the same as the original 5th - does that make sense? Anyway, here is a link to the Gear Commander site if you want to check it out for yourself:

http://www.xs4all.nl/~ator0437/gc/

=G=
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post #10 of 21 (permalink) Old Jan 6th, 2007, 1:23 pm
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Yeah. The 6th on the 800 is a bit high although my tweaked 800 pulls it fine. I went to a 41t rear and this transformed the bike - it absolutely storms out of corners now.

I should think a 6-speed box combined with lower final drive ratio would really help the 750. However, it would just be easier and probably not much more expensive to go to an 800 and get a much much better engine.

2 cylinders are all you need but 3 is a nice compromise
http://www.twpd.co.uk
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