Pulley Swap
Road Warrior
Joined: Dec 2006
Posts: 1,533
Likes: 2
From: Nebraska
I have an 07.. and looked into this. According to a couple of different Mech's it will not work because there isn't enough adjustment in the axle adjusters. To me it looked close with the stock belt but I wasn't going to tear it apart to find out. So your next alternative is to tear open the primary and change the belt. To me with the big change in the gearing then... it's not a good thing.
Your better off sticking with the 66tooth.
Your better off sticking with the 66tooth.
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Joined: Oct 2007
Posts: 73
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I was trying to match my Fat Daddys with a spoked pulley, but when they sent it, it was 70 instead of 66. The only one I could find was from Custom Chrome. I'm gonna try it anyway.
Thanks for the reply's
Thanks for the reply's
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Road Warrior
Joined: Dec 2006
Posts: 1,533
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From: Nebraska
DNA has a 66th superspoke pulley.... but I don't think I would recommend them due to the wait time.
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Outstanding HDF Member
Joined: Oct 2007
Posts: 2,018
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From: Edmond, Ok
Call Bob Wood at Wood's Performance. He just explained changing pulleys to me last week. If you change the rear pulley from a 66 tooth to a 70 tooth, you also need to change your transmission pulley (you probably have a 32 tooth, and need to change it to a 30 tooth). This WILL change your gearing. If I remember correctly, your gearing will change from 2.79 to 1 to 3.79 to 1. This will throw your speedo off by about 6%. Good luck- let us know what happens.
Cruiser
Joined: Oct 2006
Posts: 212
Likes: 2
From: Melbourne, Australia
I've got an Arlen Ness 70 tooth pully on my 07. I changed the pully to match a new rear rim and due to rim size (mostly) i had to go with a narrower belt. Other than changing the belt which meant pulling the primary apart no other mods were required. I've done just a touch over 6,000 kms including some 2 up touring and never had an issue with clearance, alignment, tyre rubbing etc.
It DOES change the gearing though. I found the speedo which was about 3-4% out from the factory drifted to about 10% out (so +6% due to the pully change) once i changed the pulley, overstating my speed by about 10% and also overstating my kms travelled by 10% (as the speed sensor and odometer is external to the transmission). I don't know where i found it but one site had a formula to calculate the change in speedo reading considering the stock and new number of pulley teeth. beaureed445 is dead on there.
The speed overstatement wasn't a major issue but the kms travelled over time i thought was a worry, so i fitted the dakota digital SIM-1 speedo calibration device and recalibrated the speedo on a dyno. My speedo is dead on now BUT since the recalibration my 6th gear light on the dash no longer works. I've had it tested on the dyno and the light still works, but with the recalibration the ECM doesn't consider me in 6th even when i am as the reading to the speedo doesn't match the stock programming.
It DOES change the gearing though. I found the speedo which was about 3-4% out from the factory drifted to about 10% out (so +6% due to the pully change) once i changed the pulley, overstating my speed by about 10% and also overstating my kms travelled by 10% (as the speed sensor and odometer is external to the transmission). I don't know where i found it but one site had a formula to calculate the change in speedo reading considering the stock and new number of pulley teeth. beaureed445 is dead on there.
The speed overstatement wasn't a major issue but the kms travelled over time i thought was a worry, so i fitted the dakota digital SIM-1 speedo calibration device and recalibrated the speedo on a dyno. My speedo is dead on now BUT since the recalibration my 6th gear light on the dash no longer works. I've had it tested on the dyno and the light still works, but with the recalibration the ECM doesn't consider me in 6th even when i am as the reading to the speedo doesn't match the stock programming.
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