Building a 40 tooth for the 1290

For all 1290 related mods.
abc
Stunt rider
 
Posts: 674
Joined: Tue Dec 17, 2013 11:21 pm
Location: snowy mountains

Re: Building a 40 tooth for the 1290

Postby abc » Tue Jan 13, 2015 12:03 am

One of the other things I am noticing is that the chain noise has reduced by about 30%. I dont know if this is because of the new sprocket offset or because the chain is seeing a different angular contact with the chain giudes and sliders but it is heaps quieter compared to the stock sprocket and I like it.
Any modifications you undertake are your sole responsibility, I am not liable for any claims relating to modifications or suggestions posted on this forum. If you undertake any modifications you do so at your own risk.

robban75
Two wheeled terror
 
Posts: 210
Joined: Mon Apr 11, 2011 9:40 pm
Location: Sweden

Re: Building a 40 tooth for the 1290

Postby robban75 » Tue Jan 13, 2015 6:33 pm

Is the cc measurement 155, 154 or 156 mm?
I have been looking at a duc 1098 streetfighter sprocket as a base and those are 154mm cc and a similar design to begin with.
2014 superduke 1290R
Love the bike, hates the manufacturer!!!

abc
Stunt rider
 
Posts: 674
Joined: Tue Dec 17, 2013 11:21 pm
Location: snowy mountains

Re: Building a 40 tooth for the 1290

Postby abc » Tue Jan 13, 2015 10:40 pm

I am not sure what cc means but if you actually mean PCD (pitch circle diameter) of the mounting holes then it measures 155.2mm
Keep in mind that the inner diameter has to be correct for the sprocket to mount up properly on the cush drive as well. Is the duke one 525 pitch as well?
Good luck and lets hope the duke one can be easily modified to fit the 1290 as that will save a lot of work.
Hope this helps you.
Any modifications you undertake are your sole responsibility, I am not liable for any claims relating to modifications or suggestions posted on this forum. If you undertake any modifications you do so at your own risk.

MaximusVR46
Two wheeled terror
 
Posts: 270
Joined: Mon Dec 30, 2013 10:24 pm
Location: Anglesey, North Wales

Re: Building a 40 tooth for the 1290

Postby MaximusVR46 » Thu Jan 15, 2015 1:26 pm

looking good nice bit of work.

Have you measured how far out your speedo / milage is now?
Lets Ride!

User avatar
ktmguy
Site Admin
 
Posts: 6100
Joined: Fri Oct 30, 2009 3:23 am
Location: Townsville Qld, Aussie.

Re: Building a 40 tooth for the 1290

Postby ktmguy » Thu Jan 15, 2015 9:47 pm

MaximusVR46 wrote:looking good nice bit of work.

Have you measured how far out your speedo / milage is now?


I'm always open to help people so I can just delete your question or you can cop the piss take. what you prefer?

Let just start of by stating that speedos are frowned up on in Australia! :lol:
If you don't do anything stupid when young, you have nothing to smile about when old!


Image

DMacL
Stunt rider
 
Posts: 857
Joined: Fri Oct 25, 2013 8:20 pm
Location: NE Jockland

Re: Building a 40 tooth for the 1290

Postby DMacL » Fri Jan 16, 2015 12:10 pm

MaximusVR46 wrote:looking good nice bit of work.

Have you measured how far out your speedo / milage is now?


You can always spot someone who hasn't wheelied a 1290 enough...

robban75
Two wheeled terror
 
Posts: 210
Joined: Mon Apr 11, 2011 9:40 pm
Location: Sweden

Re: Building a 40 tooth for the 1290

Postby robban75 » Fri Jan 16, 2015 1:06 pm

MaximusVR46 wrote:looking good nice bit of work.

Have you measured how far out your speedo / milage is now?


Don't know if it's me or abc you're referring to but if it's me the answer is no, waiting for better weather.
But I'm 95% sure the speedo will be almost correct.

Abc> I have found this sprocket, it will take wery little effort to mount up, just a bit expensive considering that you have to modify it first.
http://alienmoto.se/contents/sv/d736.html
154mm cc (Centre to Centre between the mounting holes) 154mm inner diameter.
2014 superduke 1290R
Love the bike, hates the manufacturer!!!

MaximusVR46
Two wheeled terror
 
Posts: 270
Joined: Mon Dec 30, 2013 10:24 pm
Location: Anglesey, North Wales

Re: Building a 40 tooth for the 1290

Postby MaximusVR46 » Fri Jan 16, 2015 2:28 pm

robban75 wrote:
MaximusVR46 wrote:looking good nice bit of work.

Have you measured how far out your speedo / milage is now?


Don't know if it's me or abc you're referring to but if it's me the answer is no, waiting for better weather.
But I'm 95% sure the speedo will be almost correct.

Abc> I have found this sprocket, it will take wery little effort to mount up, just a bit expensive considering that you have to modify it first.
http://alienmoto.se/contents/sv/d736.html
154mm cc (Centre to Centre between the mounting holes) 154mm inner diameter.


Sorry i was asking abc but i just wondered as going -1 +2 would throw out the speedo and add milage quicker than what you cover. That on top of a speedo thats already out from the factory.

unless i'm totally wrong?
Lets Ride!

robban75
Two wheeled terror
 
Posts: 210
Joined: Mon Apr 11, 2011 9:40 pm
Location: Sweden

Re: Building a 40 tooth for the 1290

Postby robban75 » Fri Jan 16, 2015 11:00 pm

it uses the front abs sensor for speed readings so it wont matter what you put on
2014 superduke 1290R
Love the bike, hates the manufacturer!!!

User avatar
ktmguy
Site Admin
 
Posts: 6100
Joined: Fri Oct 30, 2009 3:23 am
Location: Townsville Qld, Aussie.

Re: Building a 40 tooth for the 1290

Postby ktmguy » Sat Jan 17, 2015 1:57 am

robban75 wrote:it uses the front abs sensor for speed readings so it wont matter what you put on


Spoiler! We could had weeks of fun with that! :lol:
It has been explained countless times in the speedo issue tread...
If you don't do anything stupid when young, you have nothing to smile about when old!


Image

abc
Stunt rider
 
Posts: 674
Joined: Tue Dec 17, 2013 11:21 pm
Location: snowy mountains

Re: Building a 40 tooth for the 1290

Postby abc » Sat Jan 17, 2015 11:48 am

robban75 wrote:
MaximusVR46 wrote:looking good nice bit of work.
Abc> I have found this sprocket, it will take wery little effort to mount up, just a bit expensive considering that you have to modify it first.
http://alienmoto.se/contents/sv/d736.html
154mm cc (Centre to Centre between the mounting holes) 154mm inner diameter.

You are right that is expensive. I think I payed $48 aussie dollars for an old stock JT sprocket that had enough material left in the important areas to make the modifications worthwhile. If you find 2D drawings with detailed dimensions for that sprocket or any sprocket for that matter, just post the details and I'll check if it will fit.
It would be nice to find something that requires less work to change up +2
Any modifications you undertake are your sole responsibility, I am not liable for any claims relating to modifications or suggestions posted on this forum. If you undertake any modifications you do so at your own risk.

harold
Minimoto racer
 
Posts: 86
Joined: Sun Oct 12, 2014 11:50 am
Location: North Florida

Re: Building a 40 tooth for the 1290

Postby harold » Sun Jan 18, 2015 12:25 pm

I take it you didn't have to lengthen the chain for the 2 tooth larger sprocket?

robban75
Two wheeled terror
 
Posts: 210
Joined: Mon Apr 11, 2011 9:40 pm
Location: Sweden

Re: Building a 40 tooth for the 1290

Postby robban75 » Sun Jan 18, 2015 1:19 pm

I will measure it when it arrives this week, if it's good weather tomorrow I am going for a little drive, it's been 4 months since last time :)
2014 superduke 1290R
Love the bike, hates the manufacturer!!!

abc
Stunt rider
 
Posts: 674
Joined: Tue Dec 17, 2013 11:21 pm
Location: snowy mountains

Re: Building a 40 tooth for the 1290

Postby abc » Sun Jan 18, 2015 10:38 pm

harold wrote:I take it you didn't have to lengthen the chain for the 2 tooth larger sprocket?

No change to the standard chain length. Not sure by how much the wheelbase has been shortened as I didnt bother to measure it but the standard method for adjusting the chain tension does the job easily.
Any modifications you undertake are your sole responsibility, I am not liable for any claims relating to modifications or suggestions posted on this forum. If you undertake any modifications you do so at your own risk.

MaximusVR46
Two wheeled terror
 
Posts: 270
Joined: Mon Dec 30, 2013 10:24 pm
Location: Anglesey, North Wales

Re: Building a 40 tooth for the 1290

Postby MaximusVR46 » Thu Jan 22, 2015 2:28 pm

robban75 wrote:it uses the front abs sensor for speed readings so it wont matter what you put on


ahhhhhh doh :oops: :oops: :oops: :roll:
Lets Ride!

User avatar
shadowman
Wheelie king
 
Posts: 1120
Joined: Sun Jun 06, 2010 3:21 pm
Location: England

Re: Building a 40 tooth for the 1290

Postby shadowman » Thu Jan 22, 2015 3:14 pm

ABC - Outstanding work!!

When I see somebody with actual skills doing this stuff it encourages me to at least try and do better.

Great work
Recovering superbike addict

abc
Stunt rider
 
Posts: 674
Joined: Tue Dec 17, 2013 11:21 pm
Location: snowy mountains

Re: Building a 40 tooth for the 1290

Postby abc » Mon Apr 13, 2015 9:37 am

UPDATE:
I have now tested my bike with numerous gear ratios and can report that I have removed the 16 tooth front gear and replaced it with the original 17 tooth front. I have kept the rear at 40 tooth and have found this to be optimum for my type of riding.
Ratios tested so far = (no brake dyno just seat of the pants dyno)
17t front & 38t rear (stock)
16t front & 38 t rear
16t front & 40 t rear
17t front & 40t rear
One thing to note with the modified ratio of 16 tooth front and 40 tooth rear is that although the bike accelerated harder and produced more short punchy wheelies it competed with the traction control too much. Also although the bike was accelerating quicker the length of time the torque curve was active had been reduced. The seat of the pants feeling results in a bike that went like hell but lost the strong pull of the torque. Resulted in heaps of short sharp crazy wheelies but reduced the long and strong midrange wheelies we all love.
My first gearing change was to keep the stock 38t rear and remove the stock front 17t and replace it with a 16t. This obviously made a difference but I felt that even this simple change slightly reduced the "feeling" of strong torque through the midrange. I changed from 16f to 17f and back a number of times in an attempt to find the best mix.
This observation is based on my personal riding on my local roads so I expect others to have a different opinion!
So, I now have 17t front and 40 tooth rear and will leave that ratio fitted. With this arrangement the wheelbase is shorter and the steering quicker. Chain length is just adequate but the rear sprocket must be removed to remove the chain off the front sprocket because there is not enough adjustment at the normal chain tensioning method. If you wanted to fit a 17t front and say a 41t rear you would need a new chain length because you will run out of chain adjustment.
I am not going to get into a theoretical discussion about the characteristics of torque in a V twin and suitable gearbox and final drive ratios but from my observations this final ratio is giving me the best compromise.
Next step is to get my bike onto the dyno so I can take full advantage of all the other mods I have done. Bike still wheelies in 3 and 4th with hand fulls of throttle but I still feel it is necessary to pull fuel from the midrange in the stock Akra map and add a little more fuel up high.
Any modifications you undertake are your sole responsibility, I am not liable for any claims relating to modifications or suggestions posted on this forum. If you undertake any modifications you do so at your own risk.

User avatar
kevxtx
Stunt rider
 
Posts: 645
Joined: Sun Jun 12, 2011 5:59 am
Location: Brisbane Australia

Re: Building a 40 tooth for the 1290

Postby kevxtx » Mon Apr 13, 2015 11:27 am

Thanks for your feedback well noted, now I need a 40T rear sprocket.

abc
Stunt rider
 
Posts: 674
Joined: Tue Dec 17, 2013 11:21 pm
Location: snowy mountains

Re: Building a 40 tooth for the 1290

Postby abc » Tue Apr 14, 2015 10:30 am

Yeh I think the 40t rear is the way to go, I liked it when I went 1 tooth down on the front because it suits australian speed limits etc but I always felt that 1 down on the front was a bit to much and by continuing in that direction with the next logical gear change has shown that it is possible to go too far. If I remember I think it was you Kev that went from 17t to 16t on the front then back and forth a few times until you were convinced! Well I guess I did the same and took the 16t as the best option at the time.
I am glad I built the new 40 tooth rear sprocket and this along with the 17t front will now be my final drive ratio to make the most of this big Vee's mid range torque characteristics.
Enjoy.
Any modifications you undertake are your sole responsibility, I am not liable for any claims relating to modifications or suggestions posted on this forum. If you undertake any modifications you do so at your own risk.

Zei220
Minimoto racer
 
Posts: 34
Joined: Sun Dec 14, 2014 6:09 pm
Location: Sandbach,Cheshire

Re: Building a 40 tooth for the 1290

Postby Zei220 » Mon May 11, 2015 3:48 pm

hello, I've been talking to a guy at Talon Engineering and he tells me they can supply a 40t sprocket if we can let them have a sample of a standard sprocket, so, does anyone in the UK have a sprocket laying around? He tells they would only need it for a few days to take measurements. I'd let them have mine, but I'm off touring Germany next week. Costs would be around £40-£50.

Regards,
Dave

Flipper
Minimoto racer
 
Posts: 10
Joined: Mon Jun 08, 2015 12:34 pm
Location: Scotland

Re: Building a 40 tooth for the 1290

Postby Flipper » Tue Jun 09, 2015 7:51 am

Zei220 wrote:hello, I've been talking to a guy at Talon Engineering and he tells me they can supply a 40t sprocket if we can let them have a sample of a standard sprocket, so, does anyone in the UK have a sprocket laying around? He tells they would only need it for a few days to take measurements. I'd let them have mine, but I'm off touring Germany next week. Costs would be around £40-£50.

Regards,
Dave


Let me know who your contact at Talon is, I'll take the sprocket off mines and send it to him to get things moving on this

Cheers

F.

Zei220
Minimoto racer
 
Posts: 34
Joined: Sun Dec 14, 2014 6:09 pm
Location: Sandbach,Cheshire

Re: Building a 40 tooth for the 1290

Postby Zei220 » Tue Jun 09, 2015 9:07 am

hello,

the guys name is Scott Morton, contact number I used was 01935 471508.

Dave

Zei220
Minimoto racer
 
Posts: 34
Joined: Sun Dec 14, 2014 6:09 pm
Location: Sandbach,Cheshire

Re: Building a 40 tooth for the 1290

Postby Zei220 » Tue Jul 07, 2015 10:22 am

Hello, thanks to flipper talon are now producing 40th rear sprockets made to order.

You can order on 01935471508, ask for Scott.

Zei220
Minimoto racer
 
Posts: 34
Joined: Sun Dec 14, 2014 6:09 pm
Location: Sandbach,Cheshire

Re: Building a 40 tooth for the 1290

Postby Zei220 » Sat Jul 18, 2015 1:43 pm

The new sprocket has arrived and is fitted.

https://www.flickr.com/photos/38215980@ ... ed-public/

Previous

Return to How to do it! [SDR 1290]

Who is online

Users browsing this forum: No registered users and 2 guests