Sprocket question - MVAgusta.net
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 16 (permalink) Old 07-19-2014, 04:52 PM Thread Starter
Senior Member
 
richd748's Avatar
 
Join Date: May 2011
Posts: 376
Sprocket question

Had my 2007 F41000R coolant changed to engine ice and while at the dealership they recommended I put a Brutale rear sprocket on my bike. He said it would be two teeth up and much better for the track (less low RPM bogging). Should I do this?
richd748 is offline  
Sponsored Links
Advertisement
 
post #2 of 16 (permalink) Old 07-19-2014, 09:13 PM
Established Member
 
Brutal1078's Avatar
 
Join Date: Sep 2012
Location: Milpitas, CA
Posts: 145
Not sure how the F4 is geared, but going up 2 teeth in the rear will keep your motor higher up in the rev range where it makes more power when you are on the track. It will definitely help on tighter tracks with slow corners. If you are noticing the motor is bogging or lugging when you are the track, then you would benefit from going up a few teeth. If you are experimenting, you'll want to consider changing the front sprocket, as they are cheaper. Dropping 1 tooth in the front is like adding 3 teeth in the rear. There are a lot of formulas to follow, but it will come down how you want your power delivered and at what rpm you are comfortably riding at. Some like using the horsepower at high rpms, and some are comfortable using the torque at lower rpms..on the liter bikes anyways.

Current bike(s): 2016 Aprilia Tuono Factory 1100

Past bikes:
2005 Yamaha R6 (sold); 2009 MV Agusta Brutale 1078 (sold); 2009 Yamaha R1 (Crash at track/totaled) ;2008 KTM Superduke R (sold) ;2007 Yamaha WE 450 supermodel/street legal (sold) ;2007 Ducati 1098 (motor blown/sold); 2007 Aprilia SXV 550 (sold) ;2004 MV Agusta Brutale 750s (sold) ;2001 Ducati 996 (crashed/fixed/sold) ;2000 Buell X1 Lightning (sold) ;1995 Honda CBR 900rr (crashed/sold) ;1995 Honda CBR F3 600 (sold)
Brutal1078 is offline  
post #3 of 16 (permalink) Old 07-19-2014, 09:44 PM
Senior Member
 
theknurl's Avatar
 
Join Date: Jul 2009
Location: Palos Verdes Est, SoCal, USA
Posts: 13,908
Send a message via Skype™ to theknurl
Wink

richd748;
go to Keith Code's School.......

bog a 1000R????? you starting in 4th?

Noel-theknurl

The Forum Curmudgeon
I'm not PC either
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

'08 910R
'05 F4
ph. 310-414-7247 PST, GMT -8
PayPal;
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Skype; theknurl
theknurl is online now  
Sponsored Links
Advertisement
 
post #4 of 16 (permalink) Old 07-19-2014, 09:46 PM
Old Wing Nut
 
esq'z me's Avatar
 
Join Date: Aug 2007
Location: Marietta, GA
Posts: 18,146
Send a message via Skype™ to esq'z me
Gear your bike so you reach top speed/rpm in top gear at the braking point on the longest straight.

If you haven't got a straight where you can ever get to top speed regardless of gearing then go for the gearing that puts you in the best gear/rpm for the most corners.

Larger rear will lower top speed but then you may find yourself in between gears in a bunch of corners.

Compromise compromise.

Smaller front sprockets have benefit of lower cost and no need for longer chain but also will wear the chain out much faster. Chains like a larger radius to curve around. They also are a large change in ratio where rear sprockets will give you more choices to find the right set up for each track.

I used to be fast....now I just dream about it.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

'08 910R (Gina), '04 F4 SPR #275 Track Bike (Lola), YSR50 (The Rabbit), '71 CB100 (Lil' Red), '75 RD350C (Orange Bird) restoration project, '70 Suzuki F50 (Baby Blue)
esq'z me is offline  
post #5 of 16 (permalink) Old 07-19-2014, 10:50 PM Thread Starter
Senior Member
 
richd748's Avatar
 
Join Date: May 2011
Posts: 376
Quote:
Originally Posted by theknurl View Post
richd748;
go to Keith Code's School.......

bog a 1000R????? you starting in 4th?

I feel pretty good were it is (bog is the term the MV dealer used), saying he thought I might get better acceleration out of the corners. I usually run 2nd in the tight corners and up to 4th on longer straights (reaching 120-140's, rpm's stay around 7,000-redline). If you have modified your stock gearing then any input that you think might improve my track performance would be appreciated.

Last edited by richd748; 07-19-2014 at 11:01 PM.
richd748 is offline  
post #6 of 16 (permalink) Old 07-20-2014, 09:05 AM
Old Wing Nut
 
esq'z me's Avatar
 
Join Date: Aug 2007
Location: Marietta, GA
Posts: 18,146
Send a message via Skype™ to esq'z me
7000 rpm isn't anywhere near red line!! The power is really just about to come on!!! 8~10,000 would be a better range for power delivery.
Since you never use top gear you will find you can run higher gears with closer ratio spacing if you use a larger rear sprocket. That leads to better pull off the corners.

I put the largest rear sprocket I had on my SPR and could go higher still at the tight tracks. As is it is just right at Roebling Road (long front straight) and Barber, still too tall at Little Tally (very short straights), but I would go back down if I run Road Atlanta (very fast track with long back straight).

Your speedometer is inaccurate when you change gearing, but that can be addressed with a calibrator if desired.

I used to be fast....now I just dream about it.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

'08 910R (Gina), '04 F4 SPR #275 Track Bike (Lola), YSR50 (The Rabbit), '71 CB100 (Lil' Red), '75 RD350C (Orange Bird) restoration project, '70 Suzuki F50 (Baby Blue)
esq'z me is offline  
post #7 of 16 (permalink) Old 07-20-2014, 09:48 AM Thread Starter
Senior Member
 
richd748's Avatar
 
Join Date: May 2011
Posts: 376
Quote:
Originally Posted by esq'z me View Post
7000 rpm isn't anywhere near red line!! The power is really just about to come on!!! 8~10,000 would be a better range for power delivery.
Since you never use top gear you will find you can run higher gears with closer ratio spacing if you use a larger rear sprocket. That leads to better pull off the corners.

I put the largest rear sprocket I had on my SPR and could go higher still at the tight tracks. As is it is just right at Roebling Road (long front straight) and Barber, still too tall at Little Tally (very short straights), but I would go back down if I run Road Atlanta (very fast track with long back straight).

Your speedometer is inaccurate when you change gearing, but that can be addressed with a calibrator if desired.

I obliviously know 7000 is not redline (it does not read 7=redline). I try to maintain my rpm's between 7000 to redline. Coming into some tight corners it comes down to 7000 or a little lower but 1st gear would not be appropriate. I have been doing track days for a while and at the two main tracks 4th is highest gear on the longest straights. Maybe I will just keep stock gearing for now, going to COTA in September and from what I have been told, I will be using 6th gear on the straights there. I have a one lap video in the "on the track" thread (last page), maybe some feedback from that. Looks like going up two teeth in the back would help keep my 2nd gear RPMs in a better range for my usual tracks.

As far as the speedometer, not concerned about accuracy. Don't pay attention to my speed, but lap times. Only really know the speeds after watching my gopro video.

Last edited by richd748; 07-20-2014 at 11:08 AM.
richd748 is offline  
post #8 of 16 (permalink) Old 07-20-2014, 12:16 PM
Moderator
 
Donsy's Avatar
 
Join Date: Aug 2008
Location: Australia
Posts: 22,055
New Site Garage
If you want to change, and I would, go up at least 2 teeth at the back. Take note of your ride height before and after adjusting your chain, it will affect your bike's handling.

If you find a track where a 312R uses 6th in standard trim, show me the video please, that would be fun, the straight would have to be longer than 2km long I recon.

Dons Nel
Own - Two F4 1000R's 06 and 07.
PayPal :
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

eMial:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Mobile in Australia: 0438 385 776
Website with MV Manuals for Most models -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Donsy is offline  
post #9 of 16 (permalink) Old 07-20-2014, 09:23 PM Thread Starter
Senior Member
 
richd748's Avatar
 
Join Date: May 2011
Posts: 376
Quote:
Originally Posted by Donsy View Post
If you want to change, and I would, go up at least 2 teeth at the back. Take note of your ride height before and after adjusting your chain, it will affect your bike's handling.

If you find a track where a 312R uses 6th in standard trim, show me the video please, that would be fun, the straight would have to be longer than 2km long I recon.

Thanks for the input/advice, with past questions also. Going to go ahead and change out the back sprocket.

I saw you had the shift indicator in the "on the track" pics, how hard is it to install, is it essentially plug and play? I would like to order one.
richd748 is offline  
post #10 of 16 (permalink) Old 07-20-2014, 11:26 PM
Moderator
 
Donsy's Avatar
 
Join Date: Aug 2008
Location: Australia
Posts: 22,055
New Site Garage
Smile

Quote:
Originally Posted by richd748 View Post
I saw you had the shift indicator in the "on the track" pics, how hard is it to install, is it essentially plug and play? I would like to order one.
Very easy to install, plugs right in behind the dash.
The latest one (Gear-tech) I have is a bitch to do the actual shift light set-up, but the gear selection set-up was easy enough.
The Accumen is easy to set-up but no shift light option.
http://www.designcorse.com/shop/mv-a...ear-indicators
Attached Images
 

Dons Nel
Own - Two F4 1000R's 06 and 07.
PayPal :
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

eMial:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Mobile in Australia: 0438 385 776
Website with MV Manuals for Most models -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by Donsy; 07-20-2014 at 11:36 PM.
Donsy is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to use all of the features of the MVAgusta.net site, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome