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Old 01-13-2014, 02:35 PM   #1
porter_jamie OP
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ktm 690 gearbox wide ratio

http://www.novaracing.co.uk/index.html

these people are making me a cr gearbox for the ktm690 or supermono racing. At the same time they are going to make a wide ratio gearbox for dual sport use. If there is enough interest this will get the costs down on my gearbox as some parts will be common.

i have already ordered 2 complete cr gearboxes. they have a set of crankcases and a standard gearbox i supplied and have already worked out the ratios for the wr set. nothing on the website yet, but if you are interested it might be worth a call.

J

porter_jamie screwed with this post 02-12-2014 at 07:34 AM
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Old 01-27-2014, 08:06 PM   #2
road_donkey
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My wide ratio set is on order...should be shipping sometime in April.

Not cheap, but will make the bike much better for how I use it.
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Old 01-28-2014, 01:56 AM   #3
LukasM
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Do you have some more detailed info? Actual gear ratios, cost, etc?

With a proper title and more details this thread could drum up some interest for them.
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Old 01-28-2014, 05:54 AM   #4
road_donkey
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Quote:
Originally Posted by LukasM View Post
Do you have some more detailed info? Actual gear ratios, cost, etc?

With a proper title and more details this thread could drum up some interest for them.
I'll dig up the details when I get home from work today. Cost is roughly $2500 CAD though.
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Old 01-28-2014, 06:59 PM   #5
road_donkey
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Ratios

Dug up the ratios for the Nova wide ratio set.

Gear Input Output Ratio
1st 12 35 2.917
2nd 16 28 1.75
3rd 21 27 1.286
4th 21 22 1.048
5th 22 20 0.909
6th 24 19 0.792

Total % drop 1st to 6th - 72%

Stock total % drop 1st to 6th - 65.22%
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Old 01-28-2014, 07:28 PM   #6
lightfighter
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Interesting. Is that the limit of the case dimensions as far as total change allowed? Or is that the change you decided on?
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Old 01-28-2014, 09:16 PM   #7
road_donkey
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Originally Posted by lightfighter View Post
Interesting. Is that the limit of the case dimensions as far as total change allowed? Or is that the change you decided on?
There is very minor clearancing involved, so it seems like it is case limit. I didn't question it too much though, as I am happy with these ratios! You'd have to contact Nova to see if there is more to be had.
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Old 01-29-2014, 08:44 AM   #8
Parigi
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This is very interesting, do they have to make the whole set of gears? Wouldn't be possible to have just a shorter 1st or a longer 6th?
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Old 01-29-2014, 06:19 PM   #9
lightfighter
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i havent spent much time but wasnt able to find the stock numbers... anyone have them handy?
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Old 01-29-2014, 07:33 PM   #10
road_donkey
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Stock 690 E gearbox

Gear Input Output Ratio
1st 14 35 2.500
2nd 16 28 1.75
3rd 21 28 1.333
4th 21 23 1.095
5th 23 22 0.957
6th 23 20 0.870
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Old 01-29-2014, 07:36 PM   #11
road_donkey
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Quote:
Originally Posted by Parigi View Post
This is very interesting, do they have to make the whole set of gears? Wouldn't be possible to have just a shorter 1st or a longer 6th?
I'd imagine so; in my case though I prefer a true wide ratio gearset instead of just a lower 1st or higher 6th.
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Old 01-30-2014, 01:37 AM   #12
johnno950
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Heres the 4th/5th/6th ratios of a 690 rally replicia. First to third gear same as 690e/r
4th 23:26
5th 24:25
6th 25:24
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Old 01-31-2014, 07:42 PM   #13
road_donkey
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Strange that this thread doesn't get more attention, considering how the close ratio stock tranny is one of the few limitations of a stock 690...
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Old 02-01-2014, 09:39 AM   #14
Parigi
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CR and WR don't mean much, if the OP would rename something like wide-ratio.....
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Old 02-12-2014, 07:35 AM   #15
porter_jamie OP
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title changed to add wide ratio

edit - no it hasn't - can't work out how to do it..
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