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YB11 6 speed gearbox

 
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Martin.T



Joined: 30 Aug 2015
Posts: 18
Location: Plymouth

PostPosted: Sun Jun 25, 2017 11:07 pm    Post subject: YB11 6 speed gearbox Reply with quote

I`ve just rebuilt my YB 11 engine and fitted it with a YFZ 750 6 speed gearbox.Anyone done the same mod ? if you have what did you do about changing the sprockets. At the moment i still have the original 17/46 set up, i think i need to reduce the rear. Had a look at the ratios in the yamaha book to see what the difference is between the 750 and the 1000, with a bit of calculations i think i need to go down to a 41 rear. But if anyone know different please get in touch.
Thanks.
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vort28



Joined: 22 Mar 2010
Posts: 2194
Location: Northwest , UK

PostPosted: Mon Jun 26, 2017 12:34 pm    Post subject: Reply with quote

My YB11 has a similar mod, not one I did but the original owner had it done along with a lot of other engine work.
I can have a look at the weekend at what sprockets it has.
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who



Joined: 10 Nov 2010
Posts: 402
Location: Melbourne Australia

PostPosted: Mon Jun 26, 2017 2:44 pm    Post subject: Reply with quote

15-45
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vort28



Joined: 22 Mar 2010
Posts: 2194
Location: Northwest , UK

PostPosted: Sat Jul 08, 2017 11:15 am    Post subject: Reply with quote

Mine is 17/46 but the engine has had A LOT of tuning work , cam's , pistons, lightened/balanced, heavily ported etc , can't remember exact rear wheel BHP, but can maybe pull different gearing.
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who



Joined: 10 Nov 2010
Posts: 402
Location: Melbourne Australia

PostPosted: Thu Jul 20, 2017 8:33 am    Post subject: Reply with quote

I would have thought 17/41 would be massively tall. 15/45 is what I run on my FZR1000 race bike at a fairly short track.

I wouldn't have thought putting a 6 speed box in your engine would effect the final ratio very much?

YZF750:



YZF1000

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