124" winter build...
Grand HDF Member
Joined: Sep 2010
Posts: 3,580
Likes: 215
From: Illinois
If your are a bit crazy and have ***** of steel, why the hell not?
Thread Starter
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Road Warrior
Joined: May 2010
Posts: 1,718
Likes: 15
From: Bay area, CA
I'm not going to be making 140/140. I'm going to try to keep it closer to 125/130. Even still, your right, stock gearing would probably be fine. I had already bought the 30t pulley and I just picked up a 70t for $100. From what I've been told the freeway rpm isn't much higher then with the stock setup. Just another thing to screw with while I'm waiting on the motor, if I don't like the 30/70 then I can always go back to 32/66
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
IMO either way you won't mind the added rpm at the top. The bottom might get touchy. I have to baby mine on the streets as you have so much power down low it comes on fast. Not trying to change your mind. Go for it but be ready for that back tire to kick out. Interested in the outcome. And +1 on taking more picks as you assemble. Get used to having power everywhere anytime you want it!
HDF Community Team
Joined: Jun 2008
Posts: 4,756
Likes: 951
From: Out West
I can't wait to see the Dyno chart on that power, gonna be a beast!
I know you're having trouble sleeping, I know you sleep restlessly and wake throughout the night, the number 124 comes to mind and Bam, stupid grin comes across your face that you can't shake for nothing.
What a SCREAM that's gonna be
I know you're having trouble sleeping, I know you sleep restlessly and wake throughout the night, the number 124 comes to mind and Bam, stupid grin comes across your face that you can't shake for nothing.
What a SCREAM that's gonna be
Thread Starter
|
Road Warrior
Joined: May 2010
Posts: 1,718
Likes: 15
From: Bay area, CA
IMO either way you won't mind the added rpm at the top. The bottom might get touchy. I have to baby mine on the streets as you have so much power down low it comes on fast. Not trying to change your mind. Go for it but be ready for that back tire to kick out. Interested in the outcome. And +1 on taking more picks as you assemble. Get used to having power everywhere anytime you want it!
Thread Starter
|
Road Warrior
Joined: May 2010
Posts: 1,718
Likes: 15
From: Bay area, CA
I can't wait to see the Dyno chart on that power, gonna be a beast!
I know you're having trouble sleeping, I know you sleep restlessly and wake throughout the night, the number 124 comes to mind and Bam, stupid grin comes across your face that you can't shake for nothing.
What a SCREAM that's gonna be
I know you're having trouble sleeping, I know you sleep restlessly and wake throughout the night, the number 124 comes to mind and Bam, stupid grin comes across your face that you can't shake for nothing.
What a SCREAM that's gonna be
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
I'll cross that bridge when I break a belt. Priced it out to be about $350 to convert and Kirby is a dealer on the parts.
Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
I'm not going to be making 140/140. I'm going to try to keep it closer to 125/130. Even still, your right, stock gearing would probably be fine. I had already bought the 30t pulley and I just picked up a 70t for $100. From what I've been told the freeway rpm isn't much higher then with the stock setup. Just another thing to screw with while I'm waiting on the motor, if I don't like the 30/70 then I can always go back to 32/66
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Road Warrior
Joined: May 2010
Posts: 1,718
Likes: 15
From: Bay area, CA
Just know it is a 6% change for the 30T and another 6% change for the 70T, so 12% for both. I was pretty happy with the 30T alone but decided to up the rear to a 68T instead of the 70T. Just like soft 02 said with a 30T/70T along with a 124" engine - well that back tire will be very twitchy!
Last edited by monster715; Dec 18, 2014 at 11:08 PM.
Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
No, it is an additive change - going smaller on the front pulley is the same as going big on the rear pulley except 1 tooth on the front = 2 teeth on the back(approximately). You are compressing your gears by both of the mods, so you will shift at lower speeds but your acceleration to these speeds will be quicker. Top speed will be reduced, so if you heart is set on cruising at 80+ mph, you might want to reconsider.
Last edited by HD Pilot; Dec 18, 2014 at 11:37 PM. Reason: Spelling